An extremely narrow-band solar type IV/dm/ burst with fine structure

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Fine Structure, Solar Magnetic Field, Solar Spectra, Type 4 Bursts, Plasma Radiation, Radio Observation, Solar Corona, Spectral Line Width, Synchrotron Radiation

Scientific paper

A decimetric type IV solar burst occurring with a halfpower bandwidth of only 40 MHz is analyzed; the concurrent fine structure of the burst is concluded to be a signature for plasma wave emission rather than synchrotron emission. With plasma wave emission assumed and the most widely spread interpretation of the fine structure adopted, coronal magnetic field strengths in the range of 5.5 + or - 1.5 gauss have been computed. The magnetic field values are about half those computed for the associated type II split-band event, suggesting that entirely different conditions in two well separated sources have been detected.

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