| Title | Comparative study of electric currents and energetic particle fluxes in a solar flare and Earth magnetospheric substorm |
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| Author | Artemyev, A; Zimovets, I ; Sharykin, I; Nishimura, Y; Downs, C; Weygand, J; Fiori, R; Zhang, X -J; Runov, A; Velli, M; Angelopoulos, V; Panasenco, O; Russell, C T; Miyoshi, Y; Kasahara, S; Matsuoka, A; Yokota, S; Keika, K; Hori, T; Kazama, Y; Wang, S -Y; Shinohara, I; Ogawa, Y |
| Source | The Astrophysical Journal vol. 923, no. 2, 151, 2021 p. 1-21, https://doi.org/10.3847/1538-4357/ac2dfc  Open Access |
| Image |  |
| Year | 2021 |
| Alt Series | Natural Resources Canada, Contribution Series 20210341 |
| Publisher | IOP Publishing |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Subjects | geophysics; extraterrestrial geology; Science and Technology; Nature and Environment; geomagnetism; geomagnetic fields; geomagnetic variations; geoelectric variations; magnetosphere; magnetospheric
currents; magnetic storms; solar variations; correlations; spectral analyses; x-ray emission spectroscopy; Methodology |
| Illustrations | location maps; time series; spectra; geoscientific sketch maps; geophysical images; schematic representations; profiles; tables |
| Program | Public Safety Geoscience Assessing space weather hazards |
| Released | 2021 12 17 |
| Abstract | Magnetic field line reconnection is a universal plasma process responsible for the conversion of magnetic field energy to plasma heating and charged particle acceleration. Solar flares and Earth's
magnetospheric substorms are two of the most investigated dynamical systems where global magnetic field reconfiguration is accompanied by energization of plasma populations. Such a reconfiguration includes formation of a long-living current system
connecting the primary energy release region and cold dense conductive plasma of the photosphere/ionosphere. In both flares and substorms the evolution of this current system correlates with the formation and dynamics of energetic particle fluxes
(although energy ranges can be different for these systems). Our study is focused on the similarity between flares and substorms. Using a wide range of data sets available for flare and substorm investigations, we qualitatively compare the dynamics
of currents and energetic particle fluxes for one flare and one substorm. We show that there is a clear correlation between energetic particle precipitations (associated with energy release due to magnetic reconnection seen from riometer and hard
X-ray measurements) and magnetic field reconfiguration/formation of the current system, whereas the long-term current system evolution correlates better with hot plasma fluxes (seen from in situ and soft X-ray measurements). We then discuss how data
sets of in situ measurements of magnetospheric substorms can help interpret solar flare data. |
| Summary | (Plain Language Summary, not published)
Space weather refers to the dynamic conditions on the Sun and in the space environment, in particular, in the near-Earth environment, that can affect
critical infrastructure. NRCan operates the Canadian Space Weather Forecast Centre and conducts research into space weather effects on power systems, pipelines, radio communications and GNSS positioning to help Canadian industry understand and
mitigate the effects of space weather. This study examines the similarity between magnetic field processes involved in a solar flare on the sun and a magnetic substorm at the Earth. These similarities imply that measurements of a magnetic substorm
can help to interpret data gathered from a solar flare. |
| GEOSCAN ID | 329019 |
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