Detection of Acceleration Processes During the Initial Phase of the 12 June 2010 Flare

作者：Kashapova L K^*; Meshalkina N S; Kisil M S

来源：Solar Physics, 2012, 280(2): 525-535.

DOI：10.1007/s11207-012-0080-z

• Flares
• Energetic particles
• Radio bursts, association with flares
• X-ray bursts, association with flares
• Heating, in flares

We present an analysis of the plasma parameters during the initial phase of the 12 June 2010 flare (SOL2010-06-12T00:57). A peculiarity of the flare was the detection of gamma-ray emission that is unusual for such weak and short event. The analysis revealed the presence of a flare precursor detected about five minutes before the flare onset in 94 images which spatially coincided with the non-polarized microwave (MW) source at 17 GHz (the Nobeyama Radio Heliograph) that is the Neutral Line associated Source (NLS). A comparison of the results obtained from MW data by the Nobeyama Radio Polarimeters and the multi-frequency Siberian Radioheliograph (the new 10-antenna radio heliograph prototype at 4.6 and 6.4 GHz) and hard X-ray (HXR) observations by the Fermi Gamma-ray Space Telescope reveal the presence of accelerated electrons during the flare's initial phase. The analysis of MW and HXR spectra also confirms the presence of accelerated particles. Moreover, a good temporal correlation between several light curves in different HXR energy bands and at MW frequencies indicates the generation of both HXR and MW emission by a common population of accelerated electrons. Detection of accelerated particles during the initial phase of the flare and soft-hard-harder (SHH) behavior of the spectra indicate several episodes of particle acceleration and confirm the non-impulsive type of the flare evolution.

• 出版日期2012-10