Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977iowa.reptr....g&link_type=abstract
Progress Report Iowa Univ., Iowa City. Dept. of Physics and Astronomy.
Astronomy and Astrophysics
Astronomy
Radio Sources (Astronomy), Trajectory Analysis, Type 3 Bursts, Plasmas (Physics), Scientific Satellites
Scientific paper
Stereoscopic direction finding measurements from the IMP 8, Hawkeye 1 and Helios 2 spacecraft over baseline distances of a substantial fraction of an A.U. 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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