Yakutsk, Russian Federation
Yakutsk, Russian Federation
Yakutsk, Yakutsk, Russian Federation
Yakutsk, Russian Federation
Yakutsk, Russian Federation
Yakutsk, Russian Federation
Yakutsk, Russian Federation
from 01.01.1999 until now
Yakutsk, Russian Federation
UDK 55 Геология. Геологические и геофизические науки
We report the results of monitoring of cosmic rays and geomagnetic field along 210 magnetic meridians in Yakutia in the first half of September 2017. The energy spectrum of solar cosmic rays during Ground Level Enhancement in September 10, 2017 is estimated as J=3027E–1.99exp(–E/729 MeV). We present the results of the forecast and complex analysis of the magnetic storm on September 7–9, 2017 with Dst=–124 nT. The forecast lead time is about one day. We examine how the storm affected the electric potential and VLF signal propagation from RSDN-20 radio navigation stations. Irregular Pi3–Pi1 pulsations occurred during the September 8, 2017 magnetic storm from 12 to 20 UT. The pulsations were accompanied by variations in electrotelluric potentials and geomagnetic fields with the correlation coefficient between them ρ(E, H)=0.5÷0.9. The effects of the magnetic storm manifested themselves as an increase in the attenuation and a decrease in the phase delay of VLF radio signals.
cosmic rays, solar flares, solar proton fluxes, magnetic storm, electric potentials, VLF radio wave propagation
ОБЩАЯ ГЕЛИО-, КОСМО- И ГЕОФИЗИЧЕСКАЯ ОБСТАНОВКА В СЕНТЯБРЕ 2017 г.
В настоящее время мы находимся вблизи минимума 24-го цикла солнечной активности. В это время трудно ожидать какой-либо сильной активности Солнца и соответствующих эффектов космической погоды. Однако после длительного периода спокойствия в первой половине сентября 2017 г. Солнце неожиданно активизировалось, что проявилось в его вспышечной и корональной активности. В это время не наблюдалось каких-либо выдающихся событий — тем не менее, сама активизация Солнца в минимуме 11-летнего цикла и ее геофизические проявления обращают на себя внимание. Поэтому представляет несомненный интерес их изучение по данным комплексных наблюдений различными приборами Института космофизических исследований и аэрономии им. Ю.Г. Шафера СО РАН (ИКФИА СО РАН), образующими единую сеть пунктов измерений различных физических параметров.
После долгого затишья в начале сентября 2017 г. на Солнце появилось несколько крупных групп пятен, в которых произошел целый ряд мощных вспышек.
С 4 по 10 сентября 2017 г. на Солнце было зарегистрировано 26 вспышек класса М и 4 вспышки класса Х, что является максимальным проявлением вспышечной активности с апреля 2015 по май 2018 г. В это время космическими аппаратами серии GOES в одной и той же активной области AR 12673 на Солнце был зафиксирован ряд больших вспышек балла М и Х (рис. 3). Информация о них доступна на сайте [https://satdat.ngdc.noaa.gov/sem/goes/data/new_avg/2017/09/goes15/csv/g15_xrs_1m_20170901_20170930.csv]. Список наиболее мощных вспышек представлен в табл. 1. Большинство сопровождалось выбросами корональной массы [http://www.spaceweather.com], а в околоземном космическом пространстве были зарегистрированы возрастания потока солнечных космических лучей (СКЛ), форбуш-понижений и магнитных бурь.
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