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SXI Observation Sequence
The geosynchronous orbit of GOES allows it to have direct line-of-sight observations of the Sun, 24 hours/day, 7 days/week. The only exception to this, is near equinox, when GOES enters Earth's shadow for up to one hour each day. SXI will collect an image once per minute and the exposure settings follow a sequence that is optimized to observe three primary phenomenon as they are reflected in the Solar atmosphere: coronal structures, active regions, and solar flares.
Originally posted by DenyObfuscation
reply to post by 1AnunnakiBastard
To be honest I don't know what the inclination of the Earth is. In simple terms, if the Earth's orbit is viewed as a circle around the Sun the the Earth travels about 1 degree per day. 360 degrees, 365 days. The satellite is in a geosynchronous orbit of Earth.
Originally posted by 1AnunnakiBastard
reply to post by fixer1967
My personal opinion ALSO is that this is not an artifact. It's hard to go further with comments because as long as the other websites are down, we can't make comparisons. It looks like the imagery of NOAA is more "dirty" than SOHO. I wonder why NASA websites are crashed... But if that thing is a solid object near the Sun, it has planetary dimensions.
In the example, the "Patrol" block loops through the same 8 image set for 112 minutes. This set includes a thin polyimide pair at 4 minute cadence, and a thick polyimide and a thin beryllium pair at 8 minute cadence. These cover the CS, AR, and FL intent categories, respectively. Four times a day this set is interrupted for 8 minutes to execute a special differential emission measure (DEM) set, and eight times a day it switches to a "Test" set, used here to evaluate the relative merits of alternate exposures. Later GOES-13 sequences will take advantage of the abililty to routinely downlink multiple images per minute. The most obvious application is to augment the regular patrol sequence by using the 20 sec per minute of downlink left free in the previous example to take additional flare-related images, say, using the aluminum and thick beryllium filters. This can be effected by either taking one additional full-size image every other minute, or by adding binned, compressed, and/or partial images even more frequently. The SXI imaging system enables synchronizing image execution to within a second during the observing minute, so that such additional images can be scheduled accurately.