Stereoscopic Direction Finding Analysis of a Type III Solar Radio Burst: Evidence for Emission at Twice the Plasma Frequency.
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1977
- Accession Number
- ADA038822
Entities
People
- Donald A. Gurnett
- H. Rosenbauer
- M. M. Baumback
Organizations
- University of Iowa