The observation of an unusually fast type IV plasmoid

Details The observation of an unusually fast type IV plasmoid The observation of an unusually fast type IV plasmoid

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365l..31g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. L31-L34. Research supported by the Univers

Astronomy and Astrophysics

Astrophysics

10

Magnetohydrodynamic Waves, Shock Waves, Solar Corona, Type 4 Bursts, Solar Flares, Solar Magnetic Field, Stellar Mass Ejection, Wave Fronts

Scientific paper

A moving type IV burst of the 'isolated source' type has been detected whose out-of-plane speed, at 1600 km/sec, becomes about 2800 km/sec upon assumption of radial motion; this is twice as high as previously reported speeds for bursts of this type. While shock waves are known to have such high speeds, and a shock wave is likely to form ahead of a high-speed plasmoid, no radio signature has been observed for such a shock. This lack of shock detection may, however, be primarily due to poor observing conditions. Energetic electrons, trapped in an about 1.4 G magnetic field of the plasmoid, can adequately account for the emission.

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