This page (revision-27) was last changed on 03-Aug-2023 16:53 by Peter Young

This page was created on 02-Apr-2013 16:51 by Peter Young

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Version Date Modified Size Author Changes ... Change note
27 03-Aug-2023 16:53 5 KB Peter Young to previous
26 18-Apr-2021 18:50 5 KB RichardAdacy to previous | to last CPA
25 21-Nov-2016 13:13 5 KB RichardAdacy to previous | to last CPA
24 07-Oct-2016 17:32 5 KB Peter Young to previous | to last Added section about downloading the cutout data
23 23-Mar-2016 18:53 5 KB Peter Young to previous | to last
22 23-Mar-2016 16:16 5 KB Peter Young to previous | to last
21 23-Mar-2016 16:15 5 KB Peter Young to previous | to last

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At line 1 added 2 lines
[{ALLOW edit EISMainUsers}]
[{ALLOW view Anonymous}]
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SDO cutouts (both AIA and HMI) can be obtained very quickly through the JSOC. In this article I illustrate how cutouts corresponding to a specific EIS raster can be obtained.
SDO cutouts (both AIA and HMI) can be obtained very quickly through the JSOC. In this article I illustrate how cutouts corresponding to a specific EIS raster can be obtained. Note that the method is generally useful and does not apply specifically to EIS: all you need is a field-of-view size and a pointing location.
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!!Get AIA 193 cutouts
!!Request AIA 193 cutouts
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!!Get HMI cutouts
Users should be aware that the AIA de-spiking routine (which is automatically applied to all files) can remove real data, which particularly affects small-scale, dynamic phenomena. The spikes can be recovered, however, so please check the page [re-spiking AIA images|AIARespike].
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!!Request HMI cutouts
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!!Downloading cutout images from IDL
After you have submitted your cutout request to the JSOC you will receive a request_id of the form 'JSOC_20161007_486'. You can check the status of your request from IDL by doing:
{{{
IDL> sdo_jsoc_check_status, request_id
}}}
which will check to see if the tar file is available for downloading. If it is, then you should see a message like:
{{{
The data are available at the webpage:
http://jsoc.stanford.edu/SUM9/D862749672/S00000
}}}
You can download and unpack the tar file to your current directory by doing:
{{{
IDL> sdo_jsoc_check_status, request_id, /download
}}}
Note that the tar file is automatically removed after unpacking.
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!!Further information
Shea Hess Webber and Peter Young have written a [document|https://pyoung.org/gsfc/JSOC%20Export%20Process.pdf] giving more information about using the JSOC service.
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This performs sub-pixel interpolations so that when you make a movie from the cutouts you do not see the occasional pixel jumps that otherwise would be seen. This isn't recommended if you plan to de-spike your cutouts.
This performs sub-pixel interpolations so that when you make a movie from the cutouts you do not see the occasional pixel jumps that otherwise would be seen. This isn't recommended if you plan to re-spike your cutouts.
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The AIA de-spiking algorithm is not very good so often you will want to "respike" your images with aia_respike. This routine automatically fetches the spike file over the internet for each cutout so there's no need to download spike files for your cutouts. If you need to, however, then the RecordSet box entry is, for example:
Please check the page [re-spiking AIA images|AIARespike].
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''What about HARPs? How do I extract information for these?''\\
A HARP is a HMI Active Region Patch, i.e., a cutout of HMI data that has been processed to yield, e.g., the vector magnetic field. See the separate page on [Extracting HARP data from the JSOC|JsocHarp].
''Can I get header information from JSOC without downloading data?''\\
Putting the following URL into your browser will give a text page with the specified keywords (T_OBS, WAVELNTH, EXPTIME and NSPIKES) given as columns.
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aia.lev1_euv_12s[2011.02.10_05:00/40m@1m][193]{spike}
http://jsoc.stanford.edu/cgi-bin/ajax/show_info?ds=aia.lev1_euv_12s[2011.04.15_02:30/62m@1m][193]&key=T_OBS,WAVELNTH,EXPTIME,NSPIKES
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This page (revision-27) was last changed on 03-Aug-2023 16:53 by Peter YoungTop