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Solar minimum arrives: how to optimize RHESSI observations? Nature of solar minimum - we have a couple of years Quiet-Sun X-rays Radius measurements To.

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Presentation on theme: "Solar minimum arrives: how to optimize RHESSI observations? Nature of solar minimum - we have a couple of years Quiet-Sun X-rays Radius measurements To."— Presentation transcript:

1 Solar minimum arrives: how to optimize RHESSI observations? Nature of solar minimum - we have a couple of years Quiet-Sun X-rays Radius measurements To offpoint or not?

2 S. Sello, 2003

3 GOES

4 Dikpati et al. (2006): Cycle begins in “late 2007 or early 2008”

5 Topic Feasibility Importance (1-10) Microflares 10 1 (program calibration) Corona itself 1 3 (nonthermal tail?) CRAND halo 1 3 (physics is important) Diffuse background 1 2 (known source) Axions 1 10 (fundamental physics) General 10 2 (we're guaranteed to get limits) Quiet-Sun X-ray observations

6 Topic Feasibility Importance (1-10) Radius 1 1 (We already know the answer) Oblateness 10 3 (already have 30 sigma) Variations 1 5 (not designed for this) Coronal holes 2 1 (interesting curiosity) J2 3 5 (relativity, stellar structure) Wilson effect 10 1 (novel view of classical result) p-modes 5 2 (poor window function)) g-modes 1 10 (good window function if pointed) Roll cal 5 2 (spots used for roll transfer) Radius observations

7 How to do quiet Sun X-rays? Offpointing: initial results almost ready - not sensitive to neutron halo - impacts g-mode time series Terminator: probably not so sensitive

8 “Tail-dragging” mode

9 Terminator mode

10 Solar oscillations with a poor window function: ACRIM

11 P-modes with a good window function: BBSO


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