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Coronas Mass Ejections, Shocks, and Type II Radio BurstsCoronal mass ejections (CMEs) are the most energetic phenomena in the interplanetary medium. Type II radio bursts are the earliest indicators of particle acceleration by CME-driven shocks. There is one-to-one correspondence between large solar energetic particle (SEP) events and long wavelength type II bursts because the same CME-driven shock is supposed to accelerate electrons and ions. However, there are some significant deviations: some CMEs lacking type II bursts (radio-quiet or RQ CMEs) are associated with small SEP events while some radioloud (RL) CMEs are not associated with SEP events, suggesting subtle differences in the acceleration of electrons and protons. Not all CME-driven shocks are radio loud: more than one third of the interplanetary shocks during solar cycle 23 were radio quiet. Some RQ shocks were associated with energetic storm particle (ESP) events, which are detected when the shocks arrive at the observing spacecraft. This paper attempts to explain these contradictory results in terms of the properties of CMEs, shocks, and the ambient medium.
Document ID
20100021370
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Gopalswamy, Natchimuthuk
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2010
Subject Category
Solar Physics
Meeting Information
Meeting: AOGS 2010
Location: Hyderabad
Country: India
Start Date: July 2, 2010
End Date: July 11, 2010
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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