Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 51341 10.12737/stp-83202203 Results of current research Results of current research Results of current research Conditions for arrival of solar energetic protons in Earth after strong solar flares Conditions for arrival of solar energetic protons in Earth after strong solar flares Кичигин Геннадий Николаевич Kichigin Gennadiy Nikolaevich king@iszf.irk.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 https://orcid.org/0000-0002-9497-5823 Кравцова Марина Владимировна Kravtsova Marina Vladimirovna rina@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Сдобнов Валерий Евгеньевич Sdobnov Valeriy Evgen'evich sdobnov@iszf.irk.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation 30 09 2022 30 09 2022 8 3 22 26 22 06 2022 26 07 2022 https://zh-szf.ru/en/nauka/article/51341/view

We analyze the Sun-to-Earth transport of energetic protons accelerated in solar flares. We use a model which assumes that protons move earthward in the Parker electromagnetic field. In this model, protons are shown to be recorded on Earth when they, moving away from the solar flare region, reach the vicinity of the heliospheric current sheet, while Earth is at a distance smaller than the proton Larmor radius from the current sheet neutral line. We present the analysis of experimental data on solar flares in August–September 2011. This analysis shows that the absence of energetic protons recording in the vicinity of Earth for some major solar flares can be explained by the proposed model.

We analyze the Sun-to-Earth transport of energetic protons accelerated in solar flares. We use a model which assumes that protons move earthward in the Parker electromagnetic field. In this model, protons are shown to be recorded on Earth when they, moving away from the solar flare region, reach the vicinity of the heliospheric current sheet, while Earth is at a distance smaller than the proton Larmor radius from the current sheet neutral line. We present the analysis of experimental data on solar flares in August–September 2011. This analysis shows that the absence of energetic protons recording in the vicinity of Earth for some major solar flares can be explained by the proposed model.

 solar flares solar proton events ground level enhancements solar flares solar proton events ground level enhancements The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation The work was financially supported by the Ministry of Science and Higher Education of the Russian Federation

Bazilevskaya G.A., Krainev M.B., Machmutov V.S. The effects of the drift in the regular interplanetary magnetic field on the parameters of the solar cosmic rays. Proc. 17th International Cosmic Rays Conference, Paris, France. 1981, vol. 3, pp. 393-396. Bazilevskaya G.A., Krainev M.B., Machmutov V.S. The effects of the drift in the regular interplanetary magnetic field on the parameters of the solar cosmic rays. Proc. 17th International Cosmic Rays Conference, Paris, France. 1981, vol. 3, pp. 393-396. Berezhko E.G., Krymskii G.F. Acceleration of cosmic rays by shock waves. Soviet Physics Uspekhi. 1988, vol. 31, no. 1, pp. 27-51. Berezhko E.G., Krymskii G.F. Acceleration of cosmic rays by shock waves. Soviet Physics Uspekhi. 1988, vol. 31, no. 1, pp. 27-51. Berezhko E.G., Petukhov S.I., Taneev S.N. Particle acceleration by interplanetary shocks. Proc. 25th International Cosmic Rays Conference, Durban, South Africa. 1997, vol. 1, pp. 257-260. Berezhko E.G., Petukhov S.I., Taneev S.N. Particle acceleration by interplanetary shocks. Proc. 25th International Cosmic Rays Conference, Durban, South Africa. 1997, vol. 1, pp. 257-260. Desai M., Giacalone J. Large gradual solar energetic particle events. Living Rev. Solar Phys. 2016, vol. 13, no. 3. DOI: 10.1007/s41116-016-0002-5. Desai M., Giacalone J. Large gradual solar energetic particle events. Living Rev. Solar Phys. 2016, vol. 13, no. 3. DOI: 10.1007/s41116-016-0002-5. Echer E., Gonzalez W.D., Tsurutani B.T., Gonzalez A.L.C. Interplanetary conditions causing intense geomagnetic storms (Dst≤−100 nT) during solar cycle 23 (1996-2006). J. Geophys. Res. 2008, vol. 113, A05221. DOI: 10.1029/2007JA012744. Echer E., Gonzalez W.D., Tsurutani B.T., Gonzalez A.L.C. Interplanetary conditions causing intense geomagnetic storms (Dst≤−100 nT) during solar cycle 23 (1996-2006). J. Geophys. Res. 2008, vol. 113, A05221. DOI: 10.1029/2007JA012744. Ellison D.C., Ramaty R. Shock acceleration of electrons and ions in solar flares. Astrophys. J. 1985, vol. 298, pp. 400-408. Ellison D.C., Ramaty R. Shock acceleration of electrons and ions in solar flares. Astrophys. J. 1985, vol. 298, pp. 400-408. Kichigin G.N., Kravtsova M.V., Sdobnov V.E. Global solar magnetic field and cosmic ray ground level enhancement. Solar Phys. 2019, vol. 294, p. 116. DOI: 10.1007/s11207-019-1516-5. Kichigin G.N., Kravtsova M.V., Sdobnov V.E. Global solar magnetic field and cosmic ray ground level enhancement. Solar Phys. 2019, vol. 294, p. 116. DOI: 10.1007/s11207-019-1516-5. Lazutin L.L. Increases in SCR energetic proton fluxes on earth and their relation to solar sources. Solar-Terr. Phys. 2020, vol. 6, no. 4, pp. 40-43. DOI: 10.12737/szf-64202006. Lazutin L.L. Increases in SCR energetic proton fluxes on earth and their relation to solar sources. Solar-Terr. Phys. 2020, vol. 6, no. 4, pp. 40-43. DOI: 10.12737/szf-64202006. Logachev Yu.I., Bazilevskaya G.A., Daibog E.I., Ginzburg E.A., Ishkov V.N., Lazutin L.L., Nguyen M.D., Surova G.M., Vlasova N.A., Yakovchouk O.S. List of Solar Proton Events in the 24 Cycle of Solar Activity (2009-2019). Geophysical Center RAS, Moscow, Russia, 2019. DOI: 10.2205/ESDB-SAD-P-007. Logachev Yu.I., Bazilevskaya G.A., Daibog E.I., Ginzburg E.A., Ishkov V.N., Lazutin L.L., Nguyen M.D., Surova G.M., Vlasova N.A., Yakovchouk O.S. List of Solar Proton Events in the 24 Cycle of Solar Activity (2009-2019). Geophysical Center RAS, Moscow, Russia, 2019. DOI: 10.2205/ESDB-SAD-P-007. Ng C.K., Reames D.V., Tylka A.J. Modeling shock-accelerated solar energetic particles coupled to interplanetary Alfve ́n waves. Astrophys. J. 2003, vol. 591, pp. 461-485. DOI: 10.1086/375293. Ng C.K., Reames D.V., Tylka A.J. Modeling shock-accelerated solar energetic particles coupled to interplanetary Alfve ́n waves. Astrophys. J. 2003, vol. 591, pp. 461-485. DOI: 10.1086/375293. Parker E.N. Dynamics of the interplanetary gas and magnetic fields. Astrophys. J. 1958, vol. 128, p. 664. DOI: 10.1086/146579. Parker E.N. Dynamics of the interplanetary gas and magnetic fields. Astrophys. J. 1958, vol. 128, p. 664. DOI: 10.1086/146579. Reames D.V. What are the sources of solar energetic particles? Rev. Geophys. 1995, vol. 33, p. 585. DOI: 10.1007/s11214-015-0210-7. Reames D.V. What are the sources of solar energetic particles? Rev. Geophys. 1995, vol. 33, p. 585. DOI: 10.1007/s11214-015-0210-7. Reames D.V. Particle acceleration at the Sun and in the heliosphere. Space Sci. Rev. 1999, vol. 90, pp. 413-491. DOI: 10.1023/A:1005105831781. Reames D.V. Particle acceleration at the Sun and in the heliosphere. Space Sci. Rev. 1999, vol. 90, pp. 413-491. DOI: 10.1023/A:1005105831781. Reames D.V. The two sources of solar energetic particles. Space Sci. Rev. 2013, vol. 175, iss. 1-4, pp. 53-92. DOI: 10.1007/s11214-013-9958-9. Reames D.V. The two sources of solar energetic particles. Space Sci. Rev. 2013, vol. 175, iss. 1-4, pp. 53-92. DOI: 10.1007/s11214-013-9958-9. Richardson I.G. Identification of interplanetary coronal mass ejections at Ulysses using Multiple Solar Wind Signatures. Solar Phys. 2014, vol. 289, pp. 3843-3894. DOI: 10.1007/s11207-014-0540-8. Richardson I.G. Identification of interplanetary coronal mass ejections at Ulysses using Multiple Solar Wind Signatures. Solar Phys. 2014, vol. 289, pp. 3843-3894. DOI: 10.1007/s11207-014-0540-8. Richardson I.G., Webb D.F., Zhang J., Berdichevsky D.B., Biesecker D.A., Kasper J.C., Kataoka R., Steinberg J.T., Thompson B.J., Wu C.-C., Zhukov A.N. Correction to “Major geomagnetic storms (Dst≤−100 nT) generated by corotating interaction regions”. J. Geophys. Res. 2007, vol. 112, iss. A12. DOI: 10.1029/2007JA012332. Richardson I.G., Webb D.F., Zhang J., Berdichevsky D.B., Biesecker D.A., Kasper J.C., Kataoka R., Steinberg J.T., Thompson B.J., Wu C.-C., Zhukov A.N. Correction to “Major geomagnetic storms (Dst≤−100 nT) generated by corotating interaction regions”. J. Geophys. Res. 2007, vol. 112, iss. A12. DOI: 10.1029/2007JA012332. Schatten K.H., Wilcox J.M., Ness N.F. A model of interplanetary and coronal magnetic fields. Solar Phys. 1969, vol. 6, iss. 3, pp. 442-455. Schatten K.H., Wilcox J.M., Ness N.F. A model of interplanetary and coronal magnetic fields. Solar Phys. 1969, vol. 6, iss. 3, pp. 442-455. URL: http://wso.stanford.edu/synsourcel.html (accessed Desember 1, 2021). URL: http://wso.stanford.edu/synsourcel.html (accessed Desember 1, 2021). URL: https://cdaw.gsfc.nasa.gov/CME_list/sepe (accessed Desember 1, 2021) URL: https://cdaw.gsfc.nasa.gov/CME_list/sepe (accessed Desember 1, 2021)