Shock waves and type II radiobursts in the interplanetary medium

Details Shock waves and type II radiobursts in the interplanetary medium Shock waves and type II radiobursts in the interplanetary medium

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980soph...65..397b&link_type=abstract

Solar Physics, vol. 65, Mar. 1980, p. 397-404.

Astronomy and Astrophysics

Astronomy

12

Interplanetary Medium, Shock Wave Propagation, Type 2 Bursts, Voyager Project, High Energy Electrons, Radio Astronomy, Solar Flares, Type 3 Bursts

Scientific paper

The planetary radio astronomy experiment on the Voyager spacecraft observed several type II solar bursts at frequencies below 1.3 MHz; these correspond to shock waves at distances between 20 earth radii and 1 AU from the sun. The characteristics of these bursts are studied and the information that they give on shock waves in the interplanetary medium and on the origin of the high energy electrons which give rise to the radioemission, is discussed. The relatively frequent occurence of type II bursts at large distances from the sun favors the hypothesis of the emission by a longitudinal shockwave. The observed spectral characteristics reveal that the source of emission is restricted to only a small portion of the shock. From the relation between type II bursts, type III bursts and optical flares, it is suggested that some of the type II bursts could be excited by type III burst fast electrons which catch up the shock and are then trapped.

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