This page (revision-7) was last changed on 07-Dec-2016 14:14 by David R Williams

This page was created on 16-May-2007 13:04 by David R Williams

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At line 21 changed one line
The eclipses have their maximum duration around 20 June each year. The EIS CO is provided with the times for "XRT twilight" each orbit and, for 20 June 2009, the duration of XRT twilight was 30 minutes. The guideline for EIS COs is to begin the EIS plan 2 minutes after exiting XRT twilight. The Hinode orbit is 98 minutes, therefore the smallest possible useful observing period during the eclipse season is 66 minutes.
The eclipses have their maximum duration around 20 June each year. The EIS CO is provided with the times for "XRT twilight" each orbit and, for 20 June 2009, the duration of XRT twilight was 30 minutes. The guideline for EIS COs is to begin the EIS plan 2 minutes after exiting XRT twilight.
At line 23 changed one line
For study designers it is thus useful to make your study last 66 minutes or less in order for it to make best possible use of the EIS data allocation.
There is also often minimal overlap with SAA passes, though, which also curtail the useful observing time. There is more information at [SbandObservingInfo] on this, but the minimum useful duration is as small as 44 minutes, and as large as 62 minutes outside the SAA-free "Golden Period", and 65 minutes during the Golden period.
See [the discussion on this|SbandObservingInfo] for more details.
This page (revision-7) was last changed on 07-Dec-2016 14:14 by David R WilliamsTop