Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...63m&link_type=abstract
Observatorium für Solare Radioastronomie, International Solar Wind 8 Conference, p. 63
Astronomy and Astrophysics
Astronomy
Solar Corona, Plasma Waves, Shock Waves, Radio Spectra, Magnetoacoustic Waves, Type 2 Bursts, Radio Astronomy, Bandwidth, Drift Rate, Harmonic Analysis, Temporal Resolution, Stellar Mass Ejection, Solar Flares, Rankine-Hugoniot Relation
Scientific paper
In the solar corona shock waves generated by flares and/or coronal mass ejections can be observed by radio astronomical methods in terms of solar type 2 radio bursts. In dynamic radio spectra they appear as emission stripes slowly drifting from high to low frequencies. A sample of 25 solar type 2 radio bursts observed in the range of 40 - 170 MHz with a time resolution of 0.1 s by the new radiospectrograph of the Astrophvsikalisches Institut Potsdam in Tremsdorf is statistically investigated concerning their spectral features, i.e, drift rate, instantaneous bandwidth, and fundamental harmonic ratio. In-situ plasma wave measurements at interplanetary shocks provide the assumption that type 2 radio radiation is emitted in the vicinity of the transition region of shock waves. Thus, the instantaneous bandwidth of a solar type 2 radio burst would reflect the density jump across the associated shock wave. Comparing the inspection of the Rankine-Hugoniot relations of shock waves under coronal circumstances with those obtained from the observational study, solar type 2 radio bursts should be regarded to be generated by weak supercritical, quasi-parallel, fast magnetosonic shock waves in the corona.
Classen H.-T.
Mann Gottfried
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