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Low-Frequency Type III Bursts and Solar Energetic Particle EventsWe analyzed the coronal mass ejections (CMEs), flares, and type 11 radio bursts associated with a set of six low frequency (<14 MHz) extended type III bursts from active region 10588. The durations were measured at 1 and 14 MHz using high resolution data from Wind/WAVES and were within the range (>15 min) normally used to define these bursts. All but one of the type III bursts was not associated with a type 11 burst in the metric or longer wavelength domains. The burst without type 11 burst also lacked a solar energetic particle (SEP) event at energies >25 MeV. The 1-MHz duration of the type III burst (28 min) is near the median value of type III durations found for gradual SEP events and ground level enhancement (GLE) events. Yet, there was no sign of SEP events. On the other hand, two other type III bursts from the same active region had similar duration but accompanied by WAVES type 11 bursts; these bursts were also accompanied by SEP events detected by SOHO/ERNE. The CMEs were of similar speeds and the flares are also of similar size and duration. This study suggests that the type III burst duration may not be a good indicator of an SEP event.
Document ID
20100031235
Document Type
Conference Paper
Authors
Gopalswamy, Nat (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Makela, Pertti (Catholic Univ. of America Washington, DC, United States)
Date Acquired
August 25, 2013
Publication Date
September 6, 2010
Subject Category
Solar Physics
Meeting Information
10th Xvar Astrophysical Colloquium(Hvar)
Distribution Limits
Public
Copyright
Other