Journal article
Direction finding measurements of type III bursts in both elevation and azimuth
Solar physics, Vol.46(2), pp.475-475
02/1976
DOI: 10.1007/BF00149871
Abstract
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 III solar radio bursts in elevation (geocentric solar ecliptic latitude) and azimuth (geocentric solar ecliptic longitude) in a frequency range from 31.1 kHz to 500 kHz. IMP-8 has its spin axis perpendicular to the ecliptic plane, hence by analyzing the spin modulation of the signals the location of the type III burst projected into the ecliptic can be found. HAWKEYE 1 has its spin axis nearly parallel to the ecliptic plane, hence the elevation of the source may also be determined. The trajectory of the electrons generating the burst, projected onto the ecliptic plane, follows an Archimedean spiral. Out of the ecliptic plane the trajectory is at a nearly constant heliographic latitude. The electrons originate from a region near a solar flare. With direction measurements of elevation and azimuth along with the modulation factor it is possible to determine the source size. Typical half angle source sizes range from ∼60° at 500 kHz to ∼40° at 56.2 kHz as viewed from the sun.
Details
- Title: Subtitle
- Direction finding measurements of type III bursts in both elevation and azimuth
- Creators
- M. M. Baumback - University of IowaW. S. Kurth - University of IowaD. A. Gurnett - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Solar physics, Vol.46(2), pp.475-475
- DOI
- 10.1007/BF00149871
- ISSN
- 0038-0938
- eISSN
- 1573-093X
- Language
- English
- Date published
- 02/1976
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455263502771
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