The Decline of Solar Cycles 22 and 23 Compared

Details The Decline of Solar Cycles 22 and 23 Compared The Decline of Solar Cycles 22 and 23 Compared

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp31b07c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP31B-07

Physics

7536 Solar Activity Cycle (2162), 7538 Solar Irradiance

Scientific paper

During the declining phase of solar cycle 22, a dramatic drop by a factor of two occured in the corrected area of photospheric faculae as determined by a 1 nm bandwidth K-line filter. This filter, in the Cartesian Full Disk Telescope no. 1 (CFDT1) at the San Fernando Observatory, responds primarily to faculae in the upper photosphere. Although the sunspot area (determined from red photometric images) also dropped at this time, it seemed to recover over the succeeding months. In the year 2000 during the peak or declining phase of cycle 23, the spot area dropped suddenly by a factor of two or more. However, at this time the facular area seemed to fall only slightly. Sunspot area and facular area data will be presented and discussed for these two cycles. This research has been partially supported by grants from NSF (ATM-9912132) and NASA (NAG5-7191).

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