Journal cover Journal topic
Annales Geophysicae Sun, Earth, planets, and planetary systems An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/angeo-2018-23
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Regular paper
19 Mar 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).
Multisatellite observations of the magnetosphere response to changes in the solar wind and interplanetary magnetic field
Galina Korotova1,2, David Sibeck3, Scott Thaller4, John Wygant4, Harlan Spence5, Craig Kletzing6, Vassilis Angelopoulos7, and Robert Redmon8 1IPST, University of Maryland, College Park, MD, USA
2IZMIRAN, Russian Academy of Sciences, Moscow, Troitsk, Russia
3Code 674, NASA/GSFC, Greenbelt, MD, USA
4College of Science and Engineering, University of Minnesota, Minneapolis, MN, USA
5EOS, University of New Hampshire, Durham, NH, USA
6Department of Physics and Astronomy, Iowa University, Iowa City, IA, USA
7Department of Earth, Planetary and Space sciences, UCLA, Los Angeles, CA, USA
8Solar and Terrestrial Physics division, NGDC/NOAA, Boulder, CO, USA
Abstract. We employ multipoint observations of the magnetosphere to present case and statistical studies of the electromagnetic field and plasma response to interplanetary (IP) shocks. On February 27, 2014 the initial encounter of an IP shock with the magnetopause occurred on the early postnoon magnetosphere, consistent with the observed alignment of the shock with the spiral IMF. The dayside equatorial magnetosphere exhibited a dusk-dawn oscillatory electrical field with a period of ~ 330 s and peak to peak amplitudes of ~ 15 mV/m for a period of 30 min. The intensity of electrons in the energy range from 31.5 to 342 KeV responded with periods corresponding to the shock induced ULF electric field waves. The initial electric field perturbation was directed dawnward for this case study. We then perform a statistical study of Ey variations of the electric field and associated plasma drift Vx and Vy flow velocities for 30 magnetospheric events during the passage of interplanetary shocks. The direction of the initial Vx component of plasma flow is tailward at all local times except the nightside magnetosphere, where flows are sunward near the sun-Earth line but antisunward towards dawn and dusk. The observed directions of the azimuthal velocity Vy predominately agree with those expected for the given spiral or orthospiral shock normal orientation.
Citation: Korotova, G., Sibeck, D., Thaller, S., Wygant, J., Spence, H., Kletzing, C., Angelopoulos, V., and Redmon, R.: Multisatellite observations of the magnetosphere response to changes in the solar wind and interplanetary magnetic field, Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2018-23, in review, 2018.
Galina Korotova et al.
Galina Korotova et al.
Galina Korotova et al.

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Short summary
We performed case and statistical studies of multipoint observations of the electromagnetic field, plasma and particles in response to an IP shock. We found that the direction of the Vx component of plasma flow is tailward at all local times except the nightside magnetosphere, where flows are sunward near the Sun–Earth line but antisunward towards dawn and dusk.
We performed case and statistical studies of multipoint observations of the electromagnetic...
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