Guidelines and rules

  • Guidelines
  • General rules
  • Some important values
  • Chronology
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  • Scientific aim: monitoring long-term changes in the small-scale dynamics of all kinds of solar structures (AR, QS, CH, etc.) this campaign is thus planned on the long term (need for regular time intervals of 1 to 3 months), and should eventually last for years until EIT or SOHO dies.

  • We need a wide field of view to include as many (preferably all) kinds of solar regions as possible, including the solar limb. Our basic field of view is thus essentially a quarter-disk: one corner is near disk center and the outer edges are just beyond the limb at the pole and equator.

  • With such a field of view and using the shutterless mode of EIT, we can achieve a 68s cadence with an effective exposure quite larger than the standard synoptic exposures (best for CH and QS).

  • Based on instrument safety concerns (radiation induced aging), the compromise for the baseline duration was set to 2 hours.

  • As we want to monitor the TR as well as the corona, we run the sequences alternately in 2 bandpasses: 304A and 195A (with occasionally a third one: 171A). We started with a 304A December 2000.

    General rules

    Some important values

    Possible other schemes considered in the past: