Actions for Direction-finding measurements of type 3 radio bursts out of the ecliptic plane

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Direction-finding measurements of type 3 radio bursts out of the ecliptic plane

Author
Gurnett, D. A.
Published
Dec 1, 1975.
Physical Description
1 electronic document
Additional Creators
Baumback, M. M. and Kurth, W. S.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
Direction-finding measurements with the plasma wave experiments on the HAWKEYE 1 and IMP 8 satellites are used to find the source locations of type 3 solar radio bursts in heliocentric latitude and longitude in a frequency range from 31.1 kHz to 500 kHz. Using an empirical model for the emission frequency as a function of radial distance from the sun the three-dimensional trajectory of the type 3 radio source can be determined from direction-finding measurements at different frequencies. Since the electrons which produce these radio emissions follow the magnetic field lines from the sun these measurements provide information on the three-dimensional structure of the magnetic field in the solar wind. The source locations projected into the ecliptic plane follow an Archimedian spiral. Perpendicular to the ecliptic plane the source locations usually follow a constant heliocentric latitude. With direction-finding measurements of this type it is also possible to determine the source size from the modulation factor of the received signals.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19760014023.
Accession ID: 76N21111.
NASA-CR-146574.
U-OF-IOWA-75-45.
Workshop on Mech. for Solar Type 3 Radio Bursts; 8-9 May 1975; Berkeley, CA; United States.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15736443