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"Driverless" Shocks in the Interplanetary MediumMany interplanetary shocks have been detected without an obvious driver behind them. These shocks have been thought to be either blast waves from solar flares or shocks due to sudden increase in solar wind speed caused by interactions between large scale open and closed field lines of the Sun. We investigated this problem using a set of interplanetary shock detected {\it in situ} by the Wind space craft and tracing their solar origins using low frequency radio data obtained by the Wind/WAVES experiment. For each of these "driverless shocks" we could find a unique coronal mass ejections (CME) event observed by the SOHO (Solar and Heliospheric Observatory) coronagraphs. We also found that these CMEs were ejected at large angles from the Sun-Earth line. It appears that the "driverless shocks" are actually driver shocks, but the drivers were not intercepted by the spacecraft. We conclude that the interplanetary shocks are much more extended than the driving CMEs.
Document ID
Document Type
Gopalswamy, N.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Kaiser, M. L.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Lara, A.
(Catholic Univ. United States)
Date Acquired
August 19, 2013
Publication Date
November 18, 1999
Subject Category
Solar Physics
Meeting Information
The Universe at Low Radio Frequencies
Distribution Limits
Work of the US Gov. Public Use Permitted.

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