Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 57408 10.12737/stp-93202303 Results of current research Results of current research Results of current research Monitoring of magnetospheric parameters based on cosmic ray effects in August 2018 Monitoring of magnetospheric parameters based on cosmic ray effects in August 2018 Ковалев Иван Иванович Kovalev Ivan Ivanovich ivankov@iszf.irk.ru Олемской Сергей Владимирович Olemskoy Sergey Vladimirovich osv@iszf.irk.ru

доктор физико-математических наук;

doctor 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 2023 30 09 2023 9 3 21 24 01 03 2023 05 06 2023 https://zh-szf.ru/en/nauka/article/57408/view

Using data (uncorrected for the temperature effect) from the global network of neutron monitors (GNNM), along with data from the Yakutsk muon telescope complex and the muon hodoscope URAGAN (Moscow), we have applied a modified spectrographic global survey (SGS) method to the 2018 August event in order to split cosmic ray variations into components of primary, magnetospheric, and atmospheric origin. We obtained time variations in the 4 GV-rigidity primary particle isotropic flux and pitch-angle anisotropy, as well as in the interplanetary magnetic field (IMF) orientation. We also showed variations in the geomagnetic cutoff rigidity (GCR) in Irkutsk. Using the obtained data on the changes in the planetary system of GCR within a simple model of a bounded magnetosphere, we have calculated some parameters of magnetospheric current systems, namely, the ring current radius, the magnetopause current radius, and the Dst index.

Using data (uncorrected for the temperature effect) from the global network of neutron monitors (GNNM), along with data from the Yakutsk muon telescope complex and the muon hodoscope URAGAN (Moscow), we have applied a modified spectrographic global survey (SGS) method to the 2018 August event in order to split cosmic ray variations into components of primary, magnetospheric, and atmospheric origin. We obtained time variations in the 4 GV-rigidity primary particle isotropic flux and pitch-angle anisotropy, as well as in the interplanetary magnetic field (IMF) orientation. We also showed variations in the geomagnetic cutoff rigidity (GCR) in Irkutsk. Using the obtained data on the changes in the planetary system of GCR within a simple model of a bounded magnetosphere, we have calculated some parameters of magnetospheric current systems, namely, the ring current radius, the magnetopause current radius, and the Dst index.

 cosmic rays magnetosphere ring current geomagnetic storms cosmic rays magnetosphere ring current geomagnetic storms 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

Abunin A.A, Abunina M.A., Belov A.V., Chertok I.M. Peculiar solar sources and geospace disturbances on 20-26 August 2018. Solar Phys. 2020, vol. 295, 7. DOI: 10.1007/s11207-019-1574-8. Abunin A.A, Abunina M.A., Belov A.V., Chertok I.M. Peculiar solar sources and geospace disturbances on 20-26 August 2018. Solar Phys. 2020, vol. 295, 7. DOI: 10.1007/s11207-019-1574-8. Dvornikov V.M., Sdobnov V.E., Sergeev A.V. Spectrographic global survey method for the study of cosmic ray variations of interplanetary and magnetospheric origin. Variatsii kosmicheskikh luchei i issledovaniya kosmosa [Variations of Cosmic Rays and Space Research]. Moscow, IZMIRAN Publ., 1986, pр. 232-237. (In Russian). Dvornikov V.M., Sdobnov V.E., Sergeev A.V. Spectrographic global survey method for the study of cosmic ray variations of interplanetary and magnetospheric origin. Variatsii kosmicheskikh luchei i issledovaniya kosmosa [Variations of Cosmic Rays and Space Research]. Moscow, IZMIRAN Publ., 1986, pr. 232-237. (In Russian). Dvornikov V.M., Kravtsova M.V., Sdobnov V.E. Diagnostics of the electromagnetic characteristics of the interplanetary medium based on cosmic ray effects. Geomagnetism and Aeronomy. 2013, vol. 53, рр. 430-440. DOI: 10.1134/ S0016793213040075. Dvornikov V.M., Kravtsova M.V., Sdobnov V.E. Diagnostics of the electromagnetic characteristics of the interplanetary medium based on cosmic ray effects. Geomagnetism and Aeronomy. 2013, vol. 53, rr. 430-440. DOI: 10.1134/ S0016793213040075. Kovalev I.I. Olemskoy S.V., Sdobnov V.E. A proposal to extend the spectrographic global survey method. J. Atmos. Solar-Terr. Phys. 2022, vol. 235, 105887. DOI: 10.1016/j. jastp.2022.105887. Kovalev I.I. Olemskoy S.V., Sdobnov V.E. A proposal to extend the spectrographic global survey method. J. Atmos. Solar-Terr. Phys. 2022, vol. 235, 105887. DOI: 10.1016/j. jastp.2022.105887. Kichigin G.N., Sdobnov V.E. Geomagnetic cutoff rigidities of cosmic rays in a model of the bounded magnetosphere with the ring current. Geomagnetism and Aeronomy. 2017, vol. 57, рр. 132-136. DOI: 10.1134/S0016793217020049. Kichigin G.N., Sdobnov V.E. Geomagnetic cutoff rigidities of cosmic rays in a model of the bounded magnetosphere with the ring current. Geomagnetism and Aeronomy. 2017, vol. 57, rr. 132-136. DOI: 10.1134/S0016793217020049. Kravtsova M.V., Olemskoy S.V., Sdobnov V.E. Cosmic rays during Forbush effects in March 1989 and March 1991: Spectra of variation, anisotropy, and variations of geomagnetic cutoff rigidity. Geomagnetism and Aeronomy. 2020, vol. 60, рр. 432-440. DOI: 10.1134/S0016793220040088. Kravtsova M.V., Olemskoy S.V., Sdobnov V.E. Cosmic rays during Forbush effects in March 1989 and March 1991: Spectra of variation, anisotropy, and variations of geomagnetic cutoff rigidity. Geomagnetism and Aeronomy. 2020, vol. 60, rr. 432-440. DOI: 10.1134/S0016793220040088. URL: https://omniweb.gsfc.nasa.gov/ow.html (date of access 19 April 2023). URL: https://omniweb.gsfc.nasa.gov/ow.html (date of access 19 April 2023). URL: http://www.ysn.ru/ipm/ (date of access 19 April 2023). URL: http://www.ysn.ru/ipm/ (date of access 19 April 2023). URL: http://ckp-rf.ru/ckp/3056/ (date of access 19 April 2023). URL: http://ckp-rf.ru/ckp/3056/ (date of access 19 April 2023). URL: https://ckp-rf.ru/usu/433536/ (date of access 19 April 2023). URL: https://ckp-rf.ru/usu/433536/ (date of access 19 April 2023).