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Relations between strong high-frequency microwave bursts and proton events View all abstracts by submitter

Victor Grechnev   Submitted: 2013-08-13 01:23

Proceeding from close association between solar eruptions, flares, shock waves, and CMEs, we analyze relations between bursts at 35 GHz recorded with the Nobeyama Radio Polarimeters during 1990-2012, on the one hand, and solar energetic particle (SEP) events, on the other hand. Most west to moderately east solar events with strong bursts at 35 GHz produced near-Earth proton enhancements of J(E > 100 MeV) > 1 pfu. The strongest and hardest those caused ground level enhancements. There is a general, although scattered, correspondence between proton enhancements and peak fluxes at 35 GHz, especially pronounced if the 35 GHz flux exceeds 104 sfu and the microwave peak frequency is high. These properties indicate emission from numerous high-energy electrons in very strong magnetic fields suggesting a high rate of energy release in the flare-CME formation process. Flaring above the sunspot umbra appears to be typical of such events. Irrespective of the origin of SEPs, these circumstances demonstrate significant diagnostic potential of high-frequency microwave bursts and sunspot-associated flares for space weather forecasting. Strong prolonged bursts at 35 GHz promptly alert to hazardous SEP events with hard spectra. A few exceptional events with moderate bursts at 35 GHz and strong proton fluxes look challenging and should be investigated.

Authors: V. Grechnev, N. Meshalkina, I. Chertok, V. Kiselev
Projects: GOES Particles,GOES X-rays ,Hinode/SOT,Neutron Monitors,Nobeyama Radioheliograph,Owens Valley Solar Array,SDO-AIA,SoHO-MDI,TRACE,Yohkoh-HXT

Publication Status: PASJ, accepted
Last Modified: 2013-08-13 11:02
Go to main E-Print page  Microwave Negative Bursts as Indications of Reconnection between Eruptive Filaments and Large-Scale Coronal Magnetic Environment  Study of Rapid Formation of a Delta Sunspot Associated with the 2012 July 2 C7.4 Flare Using High-resolution Observations of  New Solar Telescope  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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