Large solar proton events associated with coronal mass ejections

Details Large solar proton events associated with coronal mass ejections Large solar proton events associated with coronal mass ejections

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh33a1483h&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH33A-1483

Astronomy and Astrophysics

Astrophysics

[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7519] Solar Physics, Astrophysics, And Astronomy / Flares

Scientific paper

We studied the solar proton events (SPEs) associated with coronal mass ejections (CMEs) during the solar cycle 23 (1997-2006). Using 63 SPE dataset, we investigated the relationship among SPE, flare, and CME, and found that (1) SPE rise time and duration time depend on CME speed and the earthward direction parameter of the CME, and (2) the SPE peak intensity depends on CME speed and X-ray Flare intensity. While inspecting the relation between SPE peak intensity and the direction parameter, we found there are two groups: first group consists of large six SPEs (> 10,000 pfu at >10 MeV proton channel of GOES satellite) and shows strong correlation (cc=0.93) between SPE peak intensity and CME direction parameter. The second group has a relatively weak SPE peak intensity and shows poor correlation between SPE peak intensity and the direction parameter. By investigating characteristics of the first group, we found that all the SPEs are associated with very fast halo CME (>1400km/s), there are preceding CMEs originated from the same solar source region and CME-streamer interaction. We speculate that the preceding CME and helmet streamer might provide seed particles for CME-driven shocks that follow. It is also found for the first group that there is a negative correlation between SPE peak intensity and SPE rise time, and that between the peak intensity and SPE duration time. In case of the second group, we found a positive correlation between those. In this talk, we will briefly present our results on the relationship between SPEs and the properties of the associated CMEs.

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