STEREO Science Center : Index of /pub/ins_data/secchi/secchi

SECCHI/HI Level-2 files

This directory contains SECCHI/HI Level-2 files. (Level-0.5 files for all the SECCHI telescopes can be found here, or organized by year, month, and day here.) The L2 directory contains filenames such as "20140101_180501_24h1A_br11.fts". The meaning of the different parts of this filename is as follows:

20140101 is the observation date, 2014-01-01.
180501 is the observation time, 18:05:01 UT.
2 represents Level-2.
4 is a code for the data units, where 4=Dn/Sec/Pixel, b=Mean Solar Brightness (MSB), and t=S10. MSB & S10 have the diffuse source correction applied.
h1 or h2 for HI-1 or HI-2.
A or B for STEREO-A or STEREO-B.
br for Buffinton/RAL background subtracted -- a full running window where the F-corona is computed as the mean of the lowest quartile of pixels.
11 is the length of the running window in days, usually either 01 or 11 for HI-1, and 03 or 11 for HI-2.

(The older L2_1_25 and L2_11_25 directories are previous versions of the Level-2 data generated with backgrounds subtracted based on running windows of either 1 or 11 days respectively. These directories are no longer being updated.)

Information about how these data are generated is available from the UK Solar System Data Centre.

The L2_SWRI directory contains a separate Level-2 product from the Southwest Research Institute in Boulder, Colorado, which is explained in more detail there.

 Name                    Last modified      Size  
 Parent Directory                             -   
 L2/                     2014-04-30 15:41    -   
 L2_11_25/               2009-06-25 13:28    -   
 L2_1_25/                2009-12-14 15:04    -   
 L2_SWRI/                2015-03-18 19:29    -

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