Other
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..616g&link_type=abstract
Journal of Geophysical Research, vol. 83, Feb. 1, 1978, p. 616-622. Navy-supported research;
Other
15
Plasma Frequencies, Radio Direction Finders, Solar Electrons, Type 3 Bursts, Very Long Base Interferometry, Electron Plasma, Electron States, Hawkeye Satellites, Helios 1, Helios 2, Imp, Solar Wind
Scientific paper
Stereoscopic direction finding measurements from the Imp 8, Hawkeye 1, and Helios 2 spacecraft over base line distances of a substantial fraction of an astronomical unit are used to directly determine the three-dimensional trajectory of a type III solar radio burst. By comparing the observed source positions with the direct in situ solar wind plasma density measurements obtained by Helios 1 and 2 near the sun, the relationship of the emission frequency to the local plasma frequency can be determined directly without any modeling assumptions. These comparisons show that the type III radio emission occurs near the second harmonic of the local electron plasma frequency. Other characteristics of the type III radio emission, such as the source size, which can be obtained from this type of analysis, are also discussed.
Baumback Mark M.
Gurnett Donald A.
Rosenbauer Helmut
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