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TitleComparative study of electric currents and energetic particle fluxes in a solar flare and Earth magnetospheric substorm
AuthorArtemyev, A; Zimovets, IORCID logo; Sharykin, IORCID logo; Nishimura, Y; Downs, CORCID logo; Weygand, JORCID logo; Fiori, RORCID logo; Zhang, X -J; Runov, A; Velli, MORCID logo; Angelopoulos, V; Panasenco, OORCID logo; Russell, C TORCID logo; Miyoshi, Y; Kasahara, S; Matsuoka, A; Yokota, SORCID logo; Keika, K; Hori, T; Kazama, Y; Wang, S -YORCID logo; Shinohara, I; Ogawa, Y
SourceThe Astrophysical Journal vol. 923, no. 2, 151, 2021 p. 1-21, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20210341
PublisherIOP Publishing
Mediapaper; on-line; digital
File formatpdf; html
Subjectsgeophysics; 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
Illustrationslocation maps; time series; spectra; geoscientific sketch maps; geophysical images; schematic representations; profiles; tables
ProgramPublic Safety Geoscience Assessing space weather hazards
Released2021 12 17
AbstractMagnetic 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.

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