Articles | Volume 40, issue 4
https://doi.org/10.5194/angeo-40-531-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-40-531-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Regular paper
| 
05 Aug 2022
Regular paper |
| 05 Aug 2022
| 05 Aug 2022
Multiple conjugate observations of magnetospheric fast flow bursts using THEMIS observations
Homayon Aryan
CORRESPONDING AUTHOR
University of California Los Angeles, Atmospheric and Oceanic Sciences, Math Sciences Building, Los Angeles, California 90095-1565, USA
Jacob Bortnik
University of California Los Angeles, Atmospheric and Oceanic Sciences, Math Sciences Building, Los Angeles, California 90095-1565, USA
Jinxing Li
University of California Los Angeles, Atmospheric and Oceanic Sciences, Math Sciences Building, Los Angeles, California 90095-1565, USA
James Michael Weygand
Department of Earth, Planetary and Space Sciences, University of California Los Angeles, California 90095, USA
Xiangning Chu
Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80303, USA
Vassilis Angelopoulos
Department of Earth, Planetary and Space Sciences, University of California Los Angeles, California 90095, USA
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Subject: Magnetosphere & space plasma physics | Keywords: Magnetosphere–ionosphere interactions
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In studies of the Earth's ionosphere, a hot topic is how to estimate ionospheric conductivity. This is hard to do for a variety of reasons that mostly amount to a lack of measurements. In this study we use satellite measurements to estimate electromagnetic work and ionospheric conductances in both hemispheres. We identify where our model estimates are inconsistent with laws of physics, which partially solves a previous problem with unrealistic predictions of ionospheric conductances.
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During magnetic storms the magnetic disturbance at low latitudes becomes asymmetric, enhanced in the evening sector and reduced around morning. This has been attributed to the asymmetric ring current. Here a new 3D current system is proposed for explaining the asymmetric signal. Anti-sunward net currents at high latitude are connected at their noon and night ends to field-aligned currents that lead the currents to the magnetopause on the dawn and dusk flanks where the current closure occurs.
Patrik Krcelic, Stein Haaland, Lukas Maes, Rikard Slapak, and Audrey Schillings
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In this paper we have used Cluster EDI data in combination with the CODIF cusp dataset from Slapak et al. (2017) to obtain parallel and convection velocities for oxygen ions; 69 % of total oxygen outflow from the high-altitude cusps escapes the magnetosphere on average; 50 % escapes tailward beyond the distant X-line. The oxygen capture-versus-escape ratio is highly dependent on geomagnetic conditions. During active conditions, the majority of oxygen outflow is convected to the plasma sheet.
Maxime Grandin, Markus Battarbee, Adnane Osmane, Urs Ganse, Yann Pfau-Kempf, Lucile Turc, Thiago Brito, Tuomas Koskela, Maxime Dubart, and Minna Palmroth
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When the terrestrial magnetic field is disturbed, particles from the near-Earth space can precipitate into the upper atmosphere. This work presents, for the first time, numerical simulations of proton precipitation in the energy range associated with the production of aurora (∼1–30 keV) using a global kinetic model of the near-Earth space: Vlasiator. We find that nightside proton precipitation can be regulated by the transition region between stretched and dipolar geomagnetic field lines.
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Short summary
In this study, we use a multipoint analysis of conjugate magnetospheric and ionospheric observations to investigate the magnetospheric and ionospheric responses to fast flow bursts that are associated with different space weather conditions. The results show that ionospheric currents are connected to the magnetospheric flows for different space weather conditions. The connection is more apparent and global for flows that are associated with a geomagnetically active condition.
In this study, we use a multipoint analysis of conjugate magnetospheric and ionospheric...
