Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 39464 10.12737/stp-63202005 Results of current research Results of current research Results of current research Disturbed magnetosphere on November 7–8, 2004 and variations of cosmic ray cutoff rigidity: Latitude effects Disturbed magnetosphere on November 7–8, 2004 and variations of cosmic ray cutoff rigidity: Latitude effects Данилова Ольга Александровна Danilova Olga Aleksandrovna md1555@mail.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Птицына Наталья Григорьевна Ptitsyna Natalia Grigoryevna nataliaptitsyna@yandex.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Тясто Марта Ильинична Tyasto Marta Ilyinichna mtyasto@mail.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;

 Санкт-Петербургский филиал Института земного магнетизма, ионосферы и распространения радиоволн РАН Санкт-Петербург Россия St.-Petersburg Filial of IZMIRAN Saint Petersburg Russian Federation Санкт-Петербургский филиал Института земного магнетизма, ионосферы и распространения радиоволн РАН Санкт-Петербург Россия St.-Petersburg Filial of IZMIRAN Saint Petersburg Russian Federation Санкт-Петербургский филиал Института земного магнетизма, ионосферы и распространения радиоволн РАН Санкт-Петербург Россия St.-Petersburg Filial of IZMIRAN Saint Petersburg Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation 6 3 34 39 https://zh-szf.ru/en/nauka/article/39464/view

We have studied the latitude behavior of cosmic ray cutoff rigidity and their sensitivity to Bz and By components of the interplanetary magnetic field and geomagnetic activity indices Dst and Kp for different phases of the November 7–8, 2004 strong magnetic storm. Cutoff rigidities have been calculated using two methods: the spectrographic global survey method in which the cutoff rigidity is determined from observational data, acquired by the neutron monitor network, and the method in which particle trajectories are calculated numerically in a model magnetic field of the magnetosphere. We have found that the sensitivity of observed cutoff rigidities to Dst changes with latitude (threshold rigidity of stations) is in antiphase with changes in the sensitivity to By. During the recovery phase of the storm, the Dst correlation with By is significantly greater than that with Bz, and the Kp correlation with Bz is greater than that with By. The By component is shown to be a predominant driver of the current systems that determine the Dst evolution during the recovery phase.

We have studied the latitude behavior of cosmic ray cutoff rigidity and their sensitivity to Bz and By components of the interplanetary magnetic field and geomagnetic activity indices Dst and Kp for different phases of the November 7–8, 2004 strong magnetic storm. Cutoff rigidities have been calculated using two methods: the spectrographic global survey method in which the cutoff rigidity is determined from observational data, acquired by the neutron monitor network, and the method in which particle trajectories are calculated numerically in a model magnetic field of the magnetosphere. We have found that the sensitivity of observed cutoff rigidities to Dst changes with latitude (threshold rigidity of stations) is in antiphase with changes in the sensitivity to By. During the recovery phase of the storm, the Dst correlation with By is significantly greater than that with Bz, and the Kp correlation with Bz is greater than that with By. The By component is shown to be a predominant driver of the current systems that determine the Dst evolution during the recovery phase.

 cutoff rigidity By Bz interplanetary magnetic field geomagnetic activity indices magnetic storm phases cutoff rigidity By Bz interplanetary magnetic field geomagnetic activity indices magnetic storm phases

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