https://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&feed=atom&action=history
Band-Specific Guidelines - Revision history
2024-03-28T19:05:10Z
Revision history for this page on the wiki
MediaWiki 1.38.6
https://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&diff=4217&oldid=prev
Mkrauss at 20:30, 30 July 2010
2010-07-30T20:30:15Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:30, 30 July 2010</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[http://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&action=edit edit me in CASA Guides]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[http://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&action=edit edit me in CASA Guides]</div></td></tr>
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Mkrauss
https://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&diff=4209&oldid=prev
Mkrauss at 20:10, 30 July 2010
2010-07-30T20:10:54Z
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[http://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&action=edit edit me in CASA Guides]</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Overview ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Overview ==</div></td></tr>
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Mkrauss
https://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&diff=4187&oldid=prev
Mkrauss: moved Band Specific Guidelines to Band-Specific Guidelines: missing hyphen
2010-07-19T23:45:35Z
<p>moved <a href="/index.php?title=Band_Specific_Guidelines" class="mw-redirect" title="Band Specific Guidelines">Band Specific Guidelines</a> to <a href="/index.php?title=Band-Specific_Guidelines" title="Band-Specific Guidelines">Band-Specific Guidelines</a>: missing hyphen</p>
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<td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 19:45, 19 July 2010</td>
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Mkrauss
https://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&diff=4184&oldid=prev
Mkrauss at 03:32, 18 July 2010
2010-07-18T03:32:32Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 23:32, 17 July 2010</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:EVLA]][[Category:Calibration]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:EVLA]][[Category:Calibration]]</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"><!--</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">== BEFORE YOU START==</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Make sure you have done the steps described at [[Initial_instructions_for_2010| the initial instructions for the 2010 Synthesis Workshop Tutorials]].</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Overview ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Overview ==</div></td></tr>
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Mkrauss
https://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&diff=4183&oldid=prev
Mkrauss at 03:31, 18 July 2010
2010-07-18T03:31:28Z
<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 23:31, 17 July 2010</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>A good example of this approach can be found in the [[EVLA Continuum Tutorial 3C391]]. Of course, there are many variations on this theme: at some point, the data could be averaged (in frequency and/or time) to reduce its size; this, of course, would depend on the tolerance for bandpass smearing, and ... Furthermore, one may wish to perform [[Self Calibration]] if the science target is sufficiently strong.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>A good example of this approach can be found in the [[EVLA Continuum Tutorial 3C391]]. Of course, there are many variations on this theme: at some point, the data could be averaged (in frequency and/or time) to reduce its size; this, of course, would depend on the tolerance for bandpass smearing, and ... Furthermore, one may wish to perform [[Self Calibration]] if the science target is sufficiently strong.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>== Low-frequency <del style="font-weight: bold; text-decoration: none;">Bands </del>(L, <del style="font-weight: bold; text-decoration: none;">C</del>) ==</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>== Low-frequency <ins style="font-weight: bold; text-decoration: none;">bands </ins>(L, <ins style="font-weight: bold; text-decoration: none;">S</ins>) ==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The greatest concern at low frequencies is radio frequency interference (RFI). A detailed description of this phenomenon, as well as guidelines for how to avoid it (prior to obtaining and observation) and mitigate its effects (if it is present in an observation) can be found on the [[Radio-Frequency Interference]] page.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>The greatest concern at low frequencies is radio frequency interference (RFI). A detailed description of this phenomenon, as well as guidelines for how to avoid it (prior to obtaining and observation) and mitigate its effects (if it is present in an observation) can be found on the [[Radio-Frequency Interference]] page.</div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== Mid-frequency bands (C, X, Ku) ==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== High-frequency bands (K, Ka, Q) ==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">At high frequencies, there is generally little radio-frequency interference, but the atmosphere can be of particular concern. This will be dependent on the weather conditions during the observation (check the weather table), but generally, the shorter radio wavelengths will be substantially more prone to atmospheric effects. </ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">One important consideration is atmospheric absorption. Since this is highly dependent on the elevation of the source, the greatest errors will be introduced when the calibration sources (especially the flux calibrator) are at a substantially different elevation from the science target. In generally, an opacity correction should be applied. </ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Note that this much occur during every step of calibration. In order to do this, the <tt>opacity</tt> parameter must be set in {{bandpass}}, {{gaincal}}, and {{applycal}}.</ins></div></td></tr>
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Mkrauss
https://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&diff=4182&oldid=prev
Mkrauss at 03:20, 18 July 2010
2010-07-18T03:20:58Z
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Imaging (clean)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Imaging (clean)</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Of course, there are many variations on this theme: at some point, the data could be averaged (in frequency and/or time) to reduce its size; this, of course, would depend on the tolerance for bandpass smearing, and ... Furthermore, one may wish to perform [[<del style="font-weight: bold; text-decoration: none;">Self_Calibration</del>]<del style="font-weight: bold; text-decoration: none;">self-calibration</del>] if the science target is sufficiently strong.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">A good example of this approach can be found in the [[EVLA Continuum Tutorial 3C391]]. </ins>Of course, there are many variations on this theme: at some point, the data could be averaged (in frequency and/or time) to reduce its size; this, of course, would depend on the tolerance for bandpass smearing, and ... Furthermore, one may wish to perform [[<ins style="font-weight: bold; text-decoration: none;">Self Calibration</ins>]] if the science target is sufficiently strong<ins style="font-weight: bold; text-decoration: none;">.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== Low-frequency Bands (L, C) ==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">The greatest concern at low frequencies is radio frequency interference (RFI). A detailed description of this phenomenon, as well as guidelines for how to avoid it (prior to obtaining and observation) and mitigate its effects (if it is present in an observation) can be found on the [[Radio-Frequency Interference]] page</ins>.</div></td></tr>
</table>
Mkrauss
https://casaguides.nrao.edu/index.php?title=Band-Specific_Guidelines&diff=4181&oldid=prev
Mkrauss: Created page with 'Category:EVLACategory:Calibration <!-- == BEFORE YOU START== Make sure you have done the steps described at [[Initial_instructions_for_2010| the initial instructions for…'
2010-07-18T03:15:45Z
<p>Created page with '<a href="/index.php?title=Category:EVLA" title="Category:EVLA">Category:EVLA</a><a href="/index.php?title=Category:Calibration" title="Category:Calibration">Category:Calibration</a> <!-- == BEFORE YOU START== Make sure you have done the steps described at [[Initial_instructions_for_2010| the initial instructions for…'</p>
<p><b>New page</b></p><div>[[Category:EVLA]][[Category:Calibration]]<br />
<br />
<!--<br />
== BEFORE YOU START==<br />
Make sure you have done the steps described at [[Initial_instructions_for_2010| the initial instructions for the 2010 Synthesis Workshop Tutorials]].<br />
--><br />
<br />
== Overview ==<br />
<br />
The general approach for EVLA data processing will be similar regardless of band, and will consist of (for continuum observations):<br />
<br />
* Flagging of any obvious bad data (flagdata, plotms, viewer)<br />
* Fixing the flux and spatial distribution of the flux density calibrator (setjy)<br />
* Performing a bandpass calibration (gaincal for initial phase, bandpass)<br />
* Performing gain calibration on calibration sources (gaincal)<br />
* Setting the flux density scale (fluxscale)<br />
* Transferring the gain calibration to the science target (applycal)<br />
* Imaging (clean)<br />
<br />
Of course, there are many variations on this theme: at some point, the data could be averaged (in frequency and/or time) to reduce its size; this, of course, would depend on the tolerance for bandpass smearing, and ... Furthermore, one may wish to perform [[Self_Calibration]self-calibration] if the science target is sufficiently strong.</div>
Mkrauss