Evolution of the Solar Corona From Cycle 22 to Cycle 23 As Revealed by X-ray Limb Synoptic Maps

Details Evolution of the Solar Corona From Cycle 22 to Cycle 23 As Revealed by X-ray Limb Synoptic Maps Evolution of the Solar Corona From Cycle 22 to Cycle 23 As Revealed by X-ray Limb Synoptic Maps

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0228s&link_type=abstract

American Astronomical Society, SPD Meeting #31, #02.28; Bulletin of the American Astronomical Society, Vol. 32, p.815

Astronomy and Astrophysics

Astronomy

Scientific paper

How does the solar corona vary within a solar cycle? We present time series observations assembled from the Yohkoh Soft X-ray Telescope (SXT) full mission image database which reveal coronal structures in the inner corona that are not easily identifiable in individual images. We have generated limb synoptic maps prepared from SXT data taken over 8 years (1992 through 1999). This period covers the decay phase of solar cycle 22 and the rise phase of solar cycle 23. The SXT images have recently been re-calibrated using more precise techniques. We will address such topics as the variation of the polar coronal holes, the lifetimes of active regions and associated streamers, and the nature of polar plumes in the two phases of the solar cycle.

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