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Onset Time of Solar Cycle 23 GLEs

Published online by Cambridge University Press:  01 November 2006

Y. H. Tang ,
C. Li  and
Y. Dai
Y. H. Tang
Affiliation:
Department of Nanjing University, Nanjing 210093, China email: [email protected] Present address: Department of Astronomy, Nanjing University, Nanjing, China
C. Li
Affiliation:
Department of Nanjing University, Nanjing 210093, China email: [email protected]
Y. Dai
Affiliation:
Department of Nanjing University, Nanjing 210093, China email: [email protected]
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Abstract

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Based on the neutron monitor counting rate profiles, soft X-ray emission from GOES, Yohkoh/HXT, RHESSI/HXT, ACE/SIS, and SOHO/LASCO CME catalog, the relationship between the onset time of solar cycle 23 Ground Level Enhancements(GLEs) and solar activity are analyzed. It was found that the correlation between the onset time of GLEs and flare maximum is better than that of the onset time of metric type II radio burst and CME. Average value of the ratio of Fe/O is about 2.65 times of coronal value in the range 30 – 40 MeV/n for all events. If considering the parent flare sites, the situation of proton acceleration in flares, and transport effect from flare sites (if it located in poorly-connected region) to well-connected region, several GLEs onset time are roughly at the peak time of the X-ray.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S233: Solar Activity and its Magnetic Origin , March 2006 , pp. 417 - 418
Copyright
© 2006 International Astronomical Union