Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 81083 10.12737/stp-103202406 19TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 5–9, 2024, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA 19TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 5–9, 2024, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA 19TH ANNUAL CONFERENCE “PLASMA PHYSICS IN THE SOLAR SYSTEM”. FEBRUARY 5–9, 2024, SPACE RESEARCH INSTITUTE RAS, MOSCOW, RUSSIA MHD waves at the pre-front of interplanetary shocks on September 6 and 7, 2017 MHD waves at the pre-front of interplanetary shocks on September 6 and 7, 2017 https://orcid.org/0000-0002-2343-1618 Стародубцев Сергей Анатольевич Starodubtsev Sergei Anatolyevich starodub@ikfia.ysn.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Шадрина Людмила Панкратьевна Shadrina Lyudmila Pankratevna lushadr@mail.ru Институт космофизических исследований и аэрономии им. Ю.Г. Шафера СО РАН Якутск Россия Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS Yakutsk Russian Federation Академия наук Республики Саха Якутск Россия Academy of Sciences of the Republic of Sakha Yakutsk Russian Federation 29 09 2024 29 09 2024 10 3 50 57 30 03 2024 02 08 2024 https://naukaru.ru/en/nauka/article/81083/view

We analyze strong space weather disturbances during first ten days of September 2017, using the geomagnetic Dst index, parameters of normals to interplanetary shock fronts, direct measurements of interplanetary magnetic field, solar wind, and cosmic ray parameters. By applying spectral analysis methods to interplanetary medium data, we analyze MHD waves at the pre-front of two interplanetary shocks responsible for geomagnetic disturbances on September 6 and 7, 2017. The main results are as follows: the contribution of three branches of MHD waves (Alfvén, fast and slow magnetosonic) to the observed spectrum of the interplanetary magnetic field modulus has been established. We have confirmed the conclusion that the generation of Alfvén waves and fast magnetosonic waves is due to the presence of low-energy proton fluxes (Ep~1 MeV) at the pre-front of interplanetary shocks. We have also discovered a predominant contribution of slow magnetosonic waves to the observed spectrum of the interplanetary magnetic field modulus, but its reason is yet unknown. It is noted that different orientations of the normals to the interplanetary shock fronts and to the direction of the interplanetary magnetic field average vector on spacecraft located fairly close to each other may indicate waviness of the shock front structure.

We analyze strong space weather disturbances during first ten days of September 2017, using the geomagnetic Dst index, parameters of normals to interplanetary shock fronts, direct measurements of interplanetary magnetic field, solar wind, and cosmic ray parameters. By applying spectral analysis methods to interplanetary medium data, we analyze MHD waves at the pre-front of two interplanetary shocks responsible for geomagnetic disturbances on September 6 and 7, 2017. The main results are as follows: the contribution of three branches of MHD waves (Alfvén, fast and slow magnetosonic) to the observed spectrum of the interplanetary magnetic field modulus has been established. We have confirmed the conclusion that the generation of Alfvén waves and fast magnetosonic waves is due to the presence of low-energy proton fluxes (Ep~1 MeV) at the pre-front of interplanetary shocks. We have also discovered a predominant contribution of slow magnetosonic waves to the observed spectrum of the interplanetary magnetic field modulus, but its reason is yet unknown. It is noted that different orientations of the normals to the interplanetary shock fronts and to the direction of the interplanetary magnetic field average vector on spacecraft located fairly close to each other may indicate waviness of the shock front structure.

 interplanetary magnetic field solar wind MHD waves interplanetary shock geomagnetic storm cosmic rays Forbush decrease interplanetary magnetic field solar wind MHD waves interplanetary shock geomagnetic storm cosmic rays Forbush decrease The work was performed under Government assignment of the Ministry of Science and Higher Education of the Russian Federation for SHICRA SB RAS (FWRS-2021-0012) and Government assignment of AN RS (Ya) (Order of the Ministry of Science and Higher Education RS(Ya) No. 01-03/32 dated January 01, 2023) The work was performed under Government assignment of the Ministry of Science and Higher Education of the Russian Federation for SHICRA SB RAS (FWRS-2021-0012) and Government assignment of AN RS (Ya) (Order of the Ministry of Science and Higher Education RS(Ya) No. 01-03/32 dated January 01, 2023)

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