Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...615..526a&link_type=abstract
The Astrophysical Journal, Volume 615, Issue 1, pp. 526-530.
Astronomy and Astrophysics
Astronomy
23
Acceleration Of Particles, Magnetohydrodynamics: Mhd, Shock Waves, Sun: Flares, Sun: Radio Radiation
Scientific paper
Using meter-wave solar radio spectral observations of the 2001 September 28 flare, we discuss simultaneously appearing type II-like bursts observed at 40-80 MHz and ~300 MHz as radio signatures of the upper and lower reconnection outflow termination shock (TS). The features are identified during the impulsive phase but well after the regular traveling-shock type II burst and during the rise of a coronal mass ejection. The upper and lower TS features reveal a tendency for flux anticorrelation over time. We use radio imaging data (Nançay Radio Heliograph) and Yohkoh soft X-ray images to support the TS hypothesis. Assuming shock drift acceleration, we compute the flux of accelerated electrons for lower TS conditions that lead to an electron population with energies of ~15 keV.
Aurass Henry
Mann Gottfried
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