Mid-Latitude Aurora in Solar Cycles 23–24 From Observations in the South of Eastern Siberia

Михалев, А. В.

doi:10.12737/szf-54201909

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…It is known that the entry of meteoroids (meteoroids) into the Earth's atmosphere is accompanied by the generation of various geophysical fields (acoustic [1,2], magnetic [3][4][5][6], light [7,8]). Meteoroids (fragments of asteroids and comets) enter the atmosphere at supersonic speeds (11-71 km/s), slow down and in some cases break up in the atmosphere in an explosive way, releasing a significant amount of energy [9].…”

Section: Introductionmentioning

confidence: 99%

Atmospheric effects caused by the fall of the Izhevsk bolide on November 17, 2021

Rybnov

Рябова

Romanovsky

et al. 2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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Using the results of instrumental observations, the acoustic, electrical and magnetic effects of the explosive destruction of the bolide on November 17, 2021 in the region of Izhevsk was established. It was found that the effects are non-local in nature and were registered at a significant epicentral distances from the explosion. It is noted that variations in the magnetic field were observed both during the fall of the bolide and during the arrival of the atmospheric signal at the registration point. Based on the characteristic frequency of the atmospheric signal, the bolide explosion energy was estimated, which was 9.4•1010 J.

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Section: Introductionmentioning

confidence: 99%

Atmospheric effects caused by the fall of the Izhevsk bolide on November 17, 2021

Rybnov

Рябова

Romanovsky

et al. 2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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“…Согласно накопленной к настоящему времени информации, обнаруженные в [Михалев и др., 2018; Михалев, 2019] типы сияний связаны с потоками электронов определенных энергий, вторгающимися в атмосферу из различных магнитосферных структур [Bame et al, 1967;Rassoul et al, 1993;Frey, 2007;Фельдштейн и др., 2010;Feldstein et al, 2014;Mishin et al, 2018;Михалев, 2019]. Сияния типа «a» возбуждаются электронами с энергиями ~0.1-10 кэВ, поступающими в авроральный овал из центрального плазменного слоя после значительного ускорения.…”

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Peculiarities of 630.0 and 557.7 nm emissions in the main ionospheric trough: March 17, 2015

Золотухина

Полех

Михалев

et al. 2021

Solnechno-Zemnaya Fizika

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Peculiarities of 557.7 and 630.0 nm emissions observed in the second step of the magnetic storm main phase at the mid-latitude observatory Tory (52° N, 103° E) on March 17, 2015 are compared with the changes in ionospheric parameters above this station, detected from ionospheric sounding data and total electron content maps. We have found that the intensity of the 557.7 and 630.0 nm emissions noticeably increased after the observatory entered into the longitudinal sector of the developed main ionospheric trough (MIT). The most powerful synchronous increases in intensities of the two emissions are associated with amplification of the westward electrojet during strengthening of the magnetospheric convection. We study the dependence of the ratios between the intensities of 630.0 nm emission recorded in the north, zenith, and south directions on the position of emitting regions relative to the MIT bottom. The SAR arc is shown to appear initially near the bottom of the MIT polar wall and approach the zenith of the station during registration of F3s reflections by an ionosonde, which indicate the presence of a polarization jet near the observation point.

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Auroras during extreme geomagnetic storms: Some features of mid-latitude aurora on February 11, 1958

Mikhalev

2024

Solnechno-Zemnaya Fizika

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This paper discusses peculiarities of the great mid-latitude aurora that occurred during the extreme magnetic storm on February 11, 1958. This mid-latitude aurora had unusual optical and spectral characteristics, among which, first of all, were very high (10⁵–10⁸ R) intensities of atomic oxygen [OI] 630.0 nm emission and an unusually high ratio of the intensities of two forbidden lines of oxygen [OI] 630.0 nm and 557.7 nm (I₆₃₀/I₅₅₇.₇). In some points, this ratio was as high as 10³–10⁴. Analysis of I₆₃₀ dynamics during other extreme geomagnetic storms and associated geophysical conditions and physical processes in Earth’s ionosphere and magnetosphere allows us to assume that great mid-latitude auroras are formed during intense substorms in main phases of magnetic storms. In order to interpret the observed features of the February 11, 1958 mid-latitude aurora, we propose to examine the mechanism of level [OI] ¹D selective filling in which reactions of resonance recharge of oxygen ions O⁺(²D)+O (³P)→O⁺(⁴S)+O(³P, ¹D) and/or reactions of oxygen atom and molecule collisions with excited components of odd nitrogen can be implemented.

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Mid-Latitude Aurora in Solar Cycles 23–24 From Observations in the South of Eastern Siberia

Cited by 4 publications

References 17 publications

Atmospheric effects caused by the fall of the Izhevsk bolide on November 17, 2021

Atmospheric effects caused by the fall of the Izhevsk bolide on November 17, 2021

Peculiarities of 630.0 and 557.7 nm emissions in the main ionospheric trough: March 17, 2015

Auroras during extreme geomagnetic storms: Some features of mid-latitude aurora on February 11, 1958

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