Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 83425 10.12737/stp-104202405 Results of current research Results of current research Results of current research Ground-based observations of the VLF auroral hiss at Lovozero and Barentsburg observatories Ground-based observations of the VLF auroral hiss at Lovozero and Barentsburg observatories https://orcid.org/0000-0002-0715-3873 Никитенко Александр Сергеевич Nikitenko Aleksandr Sergeevich alex6657328@yandex.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Клейменова Наталья Георгиевна Kleimenova Natalia Georgievna ngk1935@yandex.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 https://orcid.org/0000-0002-9957-0921 Федоренко Юрий Валентинович Fedorenko Yuriy Valentinovich yury.fedorenko@gmail.com https://orcid.org/0000-0002-7538-8156 Бекетова Елена Борисовна Beketova Elena Borisovna elena.beketova@gmail.com Полярный геофизический институт Апатиты Россия Polar Geophysical Institute Apatity Russian Federation Институт физики Земли им. О.Ю. Шмидта РАН Москва Россия Schmidt Institute of Physics of the Earth of the RAS Moscow Russian Federation Полярный геофизический институт Апатиты Россия Polar Geophysical Institute Apatity Russian Federation Филиал Мурманского арктического университета в г. Апатиты Апатиты Россия Apatity Branch of Murmansk Arctic University Apatity Russian Federation 18 12 2024 18 12 2024 10 4 37 45 23 05 2024 11 09 2024 https://naukaru.ru/en/nauka/article/83425/view

The paper presents the results of the analysis of auroral hiss bursts, measured at Lovozero and Barentsburg observatories. These points are located on close geomagnetic meridians in the auroral and circumpolar zones. The auroral hiss bursts occur first in the auroral zone at Lovozero Observatory. Then, they fade out smoothly and occur in the circumpolar zone at Barentsburg Observatory. These events are observed when geomagnetic activity and the source of phase scintillation of GPS signals move from auroral to circumpolar latitudes. Analysis of magnetic field polarization and arrival angles of the bursts has shown that the area on the Earth surface, illuminated by hiss bursts, arose at auroral latitudes near Lovozero Observatory, and then moved to higher latitudes. Since propagation of the hiss to the ground and occurrence of GPS signal scintillation requires the presence of electron density irregularities of similar scales in the ionosphere, we assume that the same irregularities could cause both phenomena. A possible cause of their occurrence is the development of current-convective and (or) drift instability in the ionosphere caused by the development of field-aligned currents. Their development is indicated by the simultaneous recording of Pi1B pulsations. The results show that the termination of hiss at auroral latitudes may be caused by a shift of the geomagnetic disturbance region to high latitudes, rather than changes of wave propagation conditions in the ionosphere.

The paper presents the results of the analysis of auroral hiss bursts, measured at Lovozero and Barentsburg observatories. These points are located on close geomagnetic meridians in the auroral and circumpolar zones. The auroral hiss bursts occur first in the auroral zone at Lovozero Observatory. Then, they fade out smoothly and occur in the circumpolar zone at Barentsburg Observatory. These events are observed when geomagnetic activity and the source of phase scintillation of GPS signals move from auroral to circumpolar latitudes. Analysis of magnetic field polarization and arrival angles of the bursts has shown that the area on the Earth surface, illuminated by hiss bursts, arose at auroral latitudes near Lovozero Observatory, and then moved to higher latitudes. Since propagation of the hiss to the ground and occurrence of GPS signal scintillation requires the presence of electron density irregularities of similar scales in the ionosphere, we assume that the same irregularities could cause both phenomena. A possible cause of their occurrence is the development of current-convective and (or) drift instability in the ionosphere caused by the development of field-aligned currents. Their development is indicated by the simultaneous recording of Pi1B pulsations. The results show that the termination of hiss at auroral latitudes may be caused by a shift of the geomagnetic disturbance region to high latitudes, rather than changes of wave propagation conditions in the ionosphere.

 GPS scintillation auroral hiss Pi1B pulsations GPS scintillation auroral hiss Pi1B pulsations The work was financially supported by RSF grant No. 22-12-20017 “Spatio-temporal structures in near-Earth space of the Arctic: from aurora through the characteristics of plasma self-organization to radio-waves propagation” The work was financially supported by RSF grant No. 22-12-20017 “Spatio-temporal structures in near-Earth space of the Arctic: from aurora through the characteristics of plasma self-organization to radio-waves propagation”

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