Complex type III-like radio emissions observed from 1 to 14 MHz

Details Complex type III-like radio emissions observed from 1 to 14 MHz Complex type III-like radio emissions observed from 1 to 14 MHz

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..397r&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 3, p. 397-400

Astronomy and Astrophysics

Astrophysics

24

Radio Science: Radio Astronomy, Radio Science: Remote Sensing, Solar Physics, Astrophysics, And Astronomy: Radio Emissions

Scientific paper

We present a morphological description of intense, complex type III-like radio emissions in the frequency range from 1 to 14 MHz. This previously unexplored frequency range, between ground-based and space-based observations, corresponds to the transition region (heliocentric distances from ~2 to 10 Rsolar) between the solar corona and interplanetary medium. The complex type III-like radio emissions, some of which are SA events [Cane et al., 1981], are found to have distinctly different radio signatures above and below ~7 MHz. Above ~7 MHz, the radio emissions consists of very rapid frequency-drifting structures with time scales of <16 seconds. Below ~7 MHz, the radio emissions generally blend into slower frequency-drifting type III-like substructures, with the addition of short-duration very narrowband features that are either very slowly frequency drifting or nondrifting. In addition, there is generally a clear diminution in the radio intensity near 7 MHz.

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