Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh31b1997d&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH31B-1997
Astronomy and Astrophysics
Astrophysics
[2114] Interplanetary Physics / Energetic Particles, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7974] Space Weather / Solar Effects
Scientific paper
Recently, it has been suggested that a twin-CME scenario is the cause of the Ground-Level-Event and extreme Solar Energetic Particle (SEP) events. Here, we extend that study and examine if the"twin CME" scenario can explain most of the large solar energetic particle (SEP) events in solar cycle 23. The "twin CME" scenario predicts that two CME eruptions in sequence during a short period of time from the same active region can lead to SEPs. We use various surveys of large SEP events and fast CMEs in solar cycle 23. We found that most large SEP events in solar cycle 23 are in agreement with the "twin-CME" scenario. For "twin CMEs"producing large SEPs, we analyze their statistical properties such as angular width, speed, and associated flare class. As a control study, we also identify single fast CMEs (V>1000km/s), i.e., without preceding CME within the time interval threshold we set (9 hours) and found none of them lead to 10 pfu and therefore did not make to the large SEP category. Some of the single CMEs show signs of producing an excess of particle at a few MeV, and are therefore nice seed particle generators. We note that there are some"twin CMEs"that fail to produce large SEPs. This is possible in the "twin-CME" scenario since the existence of the first CME does not guarantee there are both seed particles and enhanced turbulence level at the second shock.
Ding Longyun
Jiang Yuming
Li Gaojun
Zhao Lifeng
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