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On the origin of radio emissions associated with the January 6–11, 1997, CME
Author(s) -
Reiner M. J.,
Kaiser M. L.,
Fainberg J.,
Bougeret J.L.,
Stone R. G.
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl00138
Subject(s) - interplanetary spaceflight , physics , interplanetary medium , radio frequency , environmental science , radio wave , frequency drift , solar wind , astrophysics , atmospheric sciences , meteorology , astronomy , plasma , telecommunications , computer science , nuclear physics , quantum mechanics , local oscillator
Unusual type II radio emissions were generated by an Earth‐directed CME that originated at the sun on Jan. 6, 1997. The intensities of the observed radio emissions were significantly higher than for typical type II events, while the source sizes and the overall frequency drift rate were significantly smaller. By introducing a new way of presenting the radio data that inherently reveals the dynamics of the type II radio source, we used these type II radio emissions, observed by the WAVES experiment on Wind, to track this CME through the interplanetary medium (IPM). From an analysis of the observed frequencies, the frequency drift rates and the results of the Wind radio direction finding, we were able to identify specific interplanetary structures such as a CIR that were the probable sources of at least some of the type II radio emissions associated with this event. This is the first time that type II emissions have been traced to specific interplanetary structures.