Solar radio burst and in situ determination of interplanetary electron density

Details Solar radio burst and in situ determination of interplanetary electron density Solar radio burst and in situ determination of interplanetary electron density

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...90..401b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 90, Feb. 1984, p. 401-412.

Physics

62

Electron Density (Concentration), Interplanetary Medium, Solar Radio Bursts, Harmonics, Helios 1, Helios 2, Plasma Frequencies, Solar Wind

Scientific paper

The authors review and discuss a few interplanetary electron density scales which have been derived from the analysis of interplanetary solar radio bursts, and compare them to a model derived from 1974 - 1980 Helios 1 and 2 in situ density observations made in the 0.3 - 1.0 AU range. The Helios densities were normalized to 1976 with the aid of IMP and ISEE data at 1 AU, and were then sorted into 0.1 AU bins and logarithmically averaged within each bin. The best fit to these 1976-normalized, bin averages is N(RAU) = 6.1 R-2.10 cm-3. This model is in rather good agreement with the solar burst determination if the radiation is assumed to be on the second harmonic of the plasma frequency. This analysis also suggests that the radio emissions tend to be produced in regions denser than the average where the density gradient decreases faster with distance than the observed R-2.10.

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