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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!3. How much time is available for observing during eclipse season?
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.
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.
This page (revision-7) was last changed on 07-Dec-2016 14:14 by David R WilliamsTop