Correlation of near-Earth proton enhancements >100 MeV with parameters of solar microwave bursts

Solar-Terrestrial Physics

Grechnev V.V.¹  Meshalkina N.S.¹  Kiselev V.I.¹  Chertok I.M.² 

[1] Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia;Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, Troitsk, Moscow, Russia;

关键词: proton events;    flares;    radio radiation;   

DOI  :  10.12737/stp-33201701

来源: DOAJ

【 摘 要 】

We analyze the relations between various combinations of peak fluxes and fluences of solar microwave bursts at 35 GHz recorded with the Nobeyama Radio Polarimeters during 1990–2015, and corresponding parameters of proton enhancements with E>100 MeV exceeding 0.1 pfu registered by GOES monitors in near-Earth environment. The highest correlation has been found between the microwave and proton fluences. This fact reflects a dependence of the total number of protons on the total duration of the acceleration process. In the events with strong flares, the correlation coefficients of proton fluences with microwave and soft X-ray fluences are higher than those with speeds of coronal mass ejections. The results indicate a statistically larger contribution of flare processes to acceleration of high-energy protons. Acceleration by shock waves seems to be less important at high energies in events associated with strong flares, although its contribution probably prevails in weaker events. The probability of a detectable proton enhancement was found to directly depend on the peak flux and duration of a microwave burst. This can be used for diagnostics of proton enhancements based on microwave observations.

【 授权许可】

Unknown