Theoretical Predictions for Interplanetary Type II Radio Bursts

Details Theoretical Predictions for Interplanetary Type II Radio Bursts Theoretical Predictions for Interplanetary Type II Radio Bursts

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh12a0419k&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH12A-0419

Physics

2139 Interplanetary Shocks, 7513 Coronal Mass Ejections, 7534 Radio Emissions, 7847 Radiation Processes, 7871 Waves And Instabilities

Scientific paper

Type II solar radio bursts have been observed for more than 50 years. However, only in 1998 were the first in situ observations obtained of an interplanetary type II source. These observations showed electron beams, Langmuir waves, and radio emission produced upstream of a rippled CME-driven interplanetary shock. We present here a semiquantitative model of interplanetary type II radio bursts which involves: electron reflection and acceleration at the shock front; beam formation upstream of the shock via time-of-flight effects; Langmuir wave growth driven by the electron beams; and the conversion of Langmuir waves into freely propagating radiation by nonlinear wave-wave processes. We use the model to investigate: (i) the beam properties and volume emissivities of radiation as functions of location; (ii) trends in the radiation flux seen by a distant observer for varying solar wind and shock parameters; and (iii) dynamic spectra for a shock propagating from the solar corona to 1AU. Our predictions are qualitatively and semi-quantitatively consistent with available observations. The predicted emission depends most sensitively on the speed of the shock relative to the solar wind. Strong correlations are also predicted between the intensity of fundamental emission and the level of nonthermal electrons present in the tail of the incident solar wind electron distribution. Harmonic emission is predicted to be most sensitive to variations in the solar wind electron temperature. These results indicate that the bursty nature of typical type II observations is consistent with a shock propagating through an inhomogeneous solar wind.

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