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25 MeV solar proton events in Cycle 24 and previous cycles

Richardson, Ian G.; Cane, Hilary V.; von Rosenvinge, Tycho T.

We summarize observations of around a thousand solar energetic particle (SEP) events since 1967 that include ∼25 MeV protons, made by various near-Earth spacecraft (IMPs 4, 5, 7, 8, ISEE 3, SOHO), that encompass Solar Cycle 20 to the current cycle (24). We also discuss recent observations of similar SEP events in Cycle 24 made by the STEREO spacec…

Characteristics of active regions associated to large solar energetic proton events

Bronarska, K.; Michalek, G.

The relationship between properties of active regions (ARs) and solar energetic particles (SEP events, protons with energy ⩾10 MeV) is examined. For this purpose we study 84 SEP events recorded during the SOHO era (1996-2014). We compare properties of these SEP events with associated ARs, flares and CMEs. The ARs are characterized by McIntosh clas…

Visibility of coronal mass ejections in SOHO/LASCO coronagraphs

Bronarska, K.; Michalek, G.; Yashiro, S. +1 more

We studied the detection efficiency of coronal mass ejections (CMEs) of the Large Angle Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric Observatory (SOHO). For this purpose LASCO/SOHO observations are compared with these obtained by the two Solar Terrestrial Relations Observatory (STEREO) satellites in quadrature in the perio…

The study of variations of low energy cosmic helium's flux (up to 6 MeV) due to solar activity

Shayan, M.; Davoudifar, P.; Bagheri, Z.

In General, the flux of low energy cosmic rays varies with time due to solar activities. The cosmic particle fluxes were studied using data of satellites near the Earth. In this work, first we studied the variations of particle fluxes from 1 Jan to 31 Dec 2000 and 35 events were selected. Then we proposed a relation for cosmic particle flux as a f…