Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..342m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. 342-353.
Astronomy and Astrophysics
Astrophysics
2
Energetic Particles, Magnetohydrodynamic Stability, Particle Acceleration, Plasma Jets, Solar Atmosphere, Solar Flares, Plasma-Particle Interactions, Shock Waves, Solar Corona, Taylor Instability
Scientific paper
A study is presented of the dynamics of a magnetic arcade that is typical of an active region in the solar atmosphere when it is affected by a solar flare occurring somewhere within the enclosure of the arcade. As it expands in the corona, propelled by the increased pressure of the flare, the energetic flare-accelerated particles that are trapped by the field are carried along and can only escape if an appropriate instability is excited. A pressure-driven instability of the ballooning-mode type is examined as a releasing mechanism. This is excited as the plasma beta within the magnetic enclosure exceeds a critical value a short time after the flare onset and grows in times of the order of 1 s. Finally, the effect of a shock wave moving in front of the expansion on the number of particles injected into interplanetary space is discussed.
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