Type III and type I-like decametric emission in a magnetic arch

Details Type III and type I-like decametric emission in a magnetic arch Type III and type I-like decametric emission in a magnetic arch

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..353l&link_type=abstract

Astronomy and Astrophysics, vol. 61, no. 3, Nov. 1977, p. 353-362.

Astronomy and Astrophysics

Astrophysics

8

Decametric Waves, Magnetic Field Reconnection, Solar Corona, Solar Magnetic Field, Type 2 Bursts, Type 3 Bursts, Type 4 Bursts, Cyclotron Resonance, Magnetohydrodynamic Stability, Plasma-Particle Interactions

Scientific paper

Two type II-type IV events observed in the range 25-70 MHz are described. They appear with fine structures drifting positively or negatively. An interpretation in terms of local acceleration at the top of an arch after magnetic-field reconnection is given to explain the formation of high-energy beams of electrons. They give rise to the type III-like bursts propagating downwards in the corona; but since the magnetic field is increasing, the beams will be reflected in a mirror region. It is shown that conditions in the medium as well as in the beam are such that a cyclotron beam-plasma instability can occur after reflection. This emission gives rise to short-lived narrow-band bursts, the characteristics of which are in agreement with the negatively drifting fine structures. The parameters of the beam (energy at least 63 keV, velocity dispersion about 14000 km/s, relative density approximately 0.00001) are derived along with the local magnetic field in the arch (about 9.5 gauss between 1.5 and 2 solar radii).

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