Investigation of exceptional solar activity in September 2017: GLE 72 and unusual Forbush decrease in GCR

Дорман, Л. И.; Tassev, Yordan; Velinov, P.; Mishev, Alexander; Tomova, Dimitrinka; Mateev, L. N.

doi:10.1088/1742-6596/1181/1/012070

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…2017年9月10日太阳爆发的X8.2级大耀斑引发了GLE72事件, 这是最新的一个GLE质子事件, 该事件成为近几年GLE研究的主要对象. Bruno等 [10] 、Gopalswamy等 [11] 利用卫星数据给出了GLE72事件的低能端能谱; Mishev等 [12] 利用新的中子堆yiled function [13]…”

Section: Gle事件中粒子的能谱、成份、加速机制和最unclassified

Research on the peak energy spectrum of the solar cosmic ray ground level enhancement event (GLE72)

Zhang¹,

Jia²,

Wang³

2021

Acta Phys. Sin.

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The ground level enhancement (GLE) event energy spectrum provides important information about the acceleration and propagation of cosmic ray. In this paper, we analyze the proton flux peak energy spectrum of recent GLE event (2017.09 GLE72) by using GOES15 satellite and neutron monitor experiment data. The method of adjacent averaging smoothing and weighted average are applied to study GOES15 satellite data, and obtain the flux peak and flux peak time. By fitting, the energy spectrum index of proton flux peak is 1.88 in the satellite observation energy range. Again, the energy spectrum index of the neutron monitor observation energy range, 4.86, is obtained by using the new neutron monitor yield function. It can be seen that the peak energy spectrum index given by satellites in the lower energy range (5–433 MeV) is much smaller than that given by the neutron monitor in the higher energy range (0.44–19 GeV). This means that, the energy spectrum in the lower energy range is harder than that in the higher energy range. Hence, the results of the energy spectrum could be explained qualitatively by the re-acceleration mechanism of high energy solar particles. In the low corona region, first, the particles released by the solar flare are accelerated, and the energy spectrum index of the high-energy range is twice that of the low-energy range. Then part of the solar high energy particles from the low corona enter into the CME, where they will be re-acceleration by the shock wave. The GLE72 event high energy range energy spectrum index given by the neutron monitor experiment is 4.86, so the energy spectrum index in low energy range should be 4.86/2 = 2.43. However, the low energy range energy spectrum index is 1.88 (lower than 2.43 in low energy range). The reason may be that the energy spectrum index is further reduced due to the re-acceleration effect in the shock wave generated by the CME. The observation of GLE event is one of the main research subjects of the Large High Altitude Air Shower Observatory (LHAASO). Also, the GLE72 proton peak energy spectrum results provide important information to observe solar high energy particles in the LHAASO experiment.

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Section: Gle事件中粒子的能谱、成份、加速机制和最unclassified

Research on the peak energy spectrum of the solar cosmic ray ground level enhancement event (GLE72)

Zhang¹,

Jia²,

Wang³

2021

Acta Phys. Sin.

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“…As it was already mentioned in the Data and methods section, when studying the behaviour of ionospheric quantities, their relative deviations, well-known to scientists studying the ionosphere, were used, which allow to evaluate the type of response. The response of the ionosphere can be classified into two categories: positive and negative [15][16][17][18][19][20]. For this purpose, data from selected ionospheric stations obtained by GIRO were used.…”

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Post-seismic Ionosphere Effects after Croatian MW 6.4 Earthquake on December 29, 2020

Bojilova,

Atanasova

2024

C. R. Acad. Bulg. Sci.

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The main idea of the present investigation is to study the relationship between post- seismic effects as a result of Petrinja, Croatia earthquake which occurred on December 29, 2020 in some ionospheric parameters. Two types of ionospheric data were used: the critical frequency of the F2 region (foF2), obtained from the vertical sounding of the ionosphere and Total Electron Content (TEC) data. The ionospheric response is studied by the relative deviation of both quantities foF2 and TEC. The results of the ionospheric parameter behaviour show the following: a) a positive anomaly is observed in both ionospheric characteristics; b) the most significant positive response is observed at ionospheric stations closer to the epicentre; c) the delay of the observed post-seismic ionospheric effect increases with distance from the epicentre in both data used. The observed anomalies in the behaviour of considered ionospheric parameters could be associated with the considered lithospheric phenomenon because the selected period is with completely quiet geomagnetic conditions. The results of this research gives additional insight into the Lithosphere-Atmosphere-Ionosphere Coupling during Earthquake processes.

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Main ionospheric trough and field-aligned currents’ responses to the geomagnetic storms in October 2015 and September 2017

Chuchra-Konrad,

Matyjasiak,

Przepiórka-Skup

et al. 2024

Acta Geophys.

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Investigation of exceptional solar activity in September 2017: GLE 72 and unusual Forbush decrease in GCR

Cited by 6 publications

References 3 publications

Research on the peak energy spectrum of the solar cosmic ray ground level enhancement event (GLE72)

Research on the peak energy spectrum of the solar cosmic ray ground level enhancement event (GLE72)

Post-seismic Ionosphere Effects after Croatian MW 6.4 Earthquake on December 29, 2020

Main ionospheric trough and field-aligned currents’ responses to the geomagnetic storms in October 2015 and September 2017

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