Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/19340
Title: Variations of solar indices during the sunspot maximum years (1999-2002) of cycle 23
Authors: Kane, R P
Keywords: Solar indices;Sunspot maximum;Solar cycle 23
Issue Date: Dec-2004
Publisher: NISCAIR-CSIR, India
PACS No.: 96.60 Qc; 96.60 Tf; 94.20 Vv
Abstract: Comparison of the evolutions of daily and monthly values of several solar indices during 1999-2002 indicated that the daily values had large day-to-day fluctuations with peak spacings differing considerably from the 27-day solar rotation period. Plots of the percentage increases (trough-to-peak) versus temperature of the source regions of the various indices indicated a double-humped structure. The monthly values showed many peaks. The average spacing was -3.5 months (-100 days). The 12-month moving averages showed considerable differences. Some indices reached a maximum near March 2000. Some of these decreased since then and continue to decrease at present; but some reached a minimum near January 2001 and remained steady there, or started increasing again to reach a probable maximum near June 2002. Some indices did not have a maximum in March 2000 and continued to increase till June 2002. Thus, the evolutions of the various solar indices during the sunspot maximum of cycle 23 (1999-2002) are substantially different from each other. Obviously, the dynamical upheavals in the photosphere reach upper levels of the solar atmosphere with varying intensities.
Page(s): 358-366
URI: http://hdl.handle.net/123456789/19340
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.33(6) [December 2004]

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