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Some Features of Solar Proton Events on March 7, 2011, and on February 20, 2014

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The paper presents the results of studying two solar proton events—on March 7, 2011, and on February 20, 2014—which are associated with solar flares having almost the same power and located at close heliolongitudes, on the western side of the solar disk. The work was done on the basis of the experimental data obtained from the ACE spacecraft and the GOES artificial Earth satellites, located in the interplanetary space at the L1 point and inside the Earth’s magnetosphere on the geostationary orbit, respectively. A comparative analysis of the features of time profiles of solar energetic proton fluxes and variations of the interplanetary medium parameters is carried out. These parameters included the speed and density of the solar wind and the magnitude and direction of the interplanetary magnetic field. The main distinctions in the time profiles of proton fluxes of two solar events are shown to be related with the features of the interplanetary medium state on March 7, 2011, and on February 20, 2014. The results of a comparative analysis of time variations of solar proton fluxes with E > 10 and E > 30 MeV and of the Bz- and Bx-components of the interplanetary magnetic field on February 20, 2014, testify to the determining role of the interplanetary magnetic field’s structure in the formation of the features of time profiles of particle fluxes in the given event.

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ACKNOWLEDGMENTS

The authors express their deep gratitude to Yu.I. Logachev and N.V. Pereslegina for their interest in the work, as well as for their useful comments and suggestions. The experimental data were obtained at NASA’s Goddard Space Flight Center for the solar wind; for the interplanetary magnetic field in the OmniWeb: High Resolution OMNI (http://omniweb.gsfc.nasa.gov/form/omni_min.html); and, for solar proton fluxes, in the CDAWeb: the Coordinated Data Analysis Web (https://cdaweb.sci.gsfc.nasa.gov). The information on solar flares and coronal mass ejections was obtained in Coordinated Data Analysis Workshops (https://cdaw.gsfc.nasa.gov), in the SOHO LASCO CME Catalog (https://cdaw.gsfc.nasa.gov/CME_list/), and in the WSA-ENLIL-DONKI-HELCATS–Solar Wind and CMEs for 2007-2019 (http://helioweather.net/archive/2014/02).

Funding

The work was supported by the Russian Foundation for Basic Research, project no. 19-02-00264.

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Authors and Affiliations

  1. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, 119991, Moscow, Russia

    N. A. Vlasova, V. I. Tulupov & V. V. Kalegaev

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  1. N. A. Vlasova
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  2. V. I. Tulupov
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  3. V. V. Kalegaev
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Correspondence to N. A. Vlasova.

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In memory of German Pavlovich Lyubimov

Translated by Yu. Preobrazhensky

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Vlasova, N.A., Tulupov, V.I. & Kalegaev, V.V. Some Features of Solar Proton Events on March 7, 2011, and on February 20, 2014. Cosmic Res 59, 250–258 (2021). https://doi.org/10.1134/S0010952521040067

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