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White-light and radio sounding observations of coronal transientsA concerted search for coronal transients was conducted with the 'Solwind' coronagraph during the solar occultations of the two Helios spacecraft in October/November 1979. The polarization angle and bandwidth of the linearly polarized S-band downlink signal were monitored at the three 64-m tracking stations of the NASA Deep Space Network to determine coronal Faraday rotation and spectral broadening. A one-to-one correspondence could be established between abrupt disturbances in the two signal parameters and the passage of a white-light transient through the signal ray path from spacecraft to earth. The white-light morphology and the additional information provided by the radio sounding coverage are presented for each of the five distinct events recorded. Although no specific example could be observed in sufficient detail in both white light and Faraday rotation to derive the small-scale magnetic structure, some qualitative descriptions of the orientation and rough estimates of the magnitude of the transient magnetic field could be made.
Document ID
19860036822
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Bird, M. K.
(Bonn Univ. Germany)
Volland, H.
(Bonn, Universitaet Germany)
Howard, R. A.
(Bonn Univ. Germany)
Koomen, M. J.
(Bonn Univ. Germany)
Michels, D. J.
(Bonn Univ. Germany)
Sheeley, N. R., Jr.
(U.S. Navy, Naval Research Laboratory, Washington DC, United States)
Amstrong, J. W.
(Bonn Univ. Germany)
Seidel, B. L.
(Bonn Univ. Germany)
Stelzried, C. T.
(Bonn Univ. Germany)
Woo, R.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 12, 2013
Publication Date
August 1, 1985
Publication Information
Publication: Solar Physics
Volume: 98
ISSN: 0038-0938
Subject Category
Solar Physics
Accession Number
86A21560
Distribution Limits
Public
Copyright
Other

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