Search Publications
The evolving paradigm of the subauroral geospace
Mishin, Evgeny V.
An assessment of the status quo of fast subauroral flows—subauroral ion drifts (SAID) and subauroral polarization streams (SAPS), is presented. For a few decades, their development has been interpreted in terms of the voltage and current magnetospheric generators based largely on the drift motion of test particles. Recent multispacecraft observati…
Modeling of the cold electron plasma density for radiation belt physics
Merkin, V. G.; Pierrard, V.; Ukhorskiy, A. Y. +8 more
This review focusses strictly on existing plasma density models, including ionospheric source models, empirical density models, physics-based and machine-learning density models. This review is framed in the context of radiation belt physics and space weather codes. The review is limited to the most commonly used models or to models recently devel…
Mesoscale phenomena and their contribution to the global response: a focus on the magnetotail transition region and magnetosphere-ionosphere coupling
Wang, Chih-Ping; Nishimura, Yukitoshi; Malaspina, David +24 more
An important question that is being increasingly studied across subdisciplines of Heliophysics is "how do mesoscale phenomena contribute to the global response of the system?" This review paper focuses on this question within two specific but interlinked regions in Near-Earth space: the magnetotail's transition region to the inner magnetosphere an…
Evaluating the performance of empirical models of total electron density and whistler-mode wave amplitude in the Earth's inner magnetosphere
Ma, Qianli; Shen, Xiao-Chen; Li, Wen +4 more
Empirical models have been previously developed using the large dataset of satellite observations to obtain the global distributions of total electron density and whistler-mode wave power, which are important in modeling radiation belt dynamics. In this paper, we apply the empirical models to construct the total electron density and the wave ampli…
Full-wave modeling of EMIC wave packets: ducted propagation and reflected waves
Ma, Qianli; Shen, Xiao-Chen; Hanzelka, Miroslav +4 more
Electromagnetic ion cyclotron (EMIC) waves can scatter radiation belt electrons with energies of a few hundred keV and higher. To accurately predict this scattering and the resulting precipitation of these relativistic electrons on short time scales, we need detailed knowledge of the wave field's spatio-temporal evolution, which cannot be obtained…
On the phenomenology of magnetosheath jets with insight from theory, modelling, numerical simulations and observations by Cluster spacecraft
Voitcu, Gabriel; Echim, Marius; Munteanu, Costel +5 more
During recent years magnetosheath plasma structures called "jets" are identified in spacecraft data as localized regions in the magnetosheath where the dynamic pressure is enhanced compared to the background. Although the nomenclature and detection algorithms vary from author to author, magnetosheath jets are part of a larger class of phenomena wh…
How to improve our understanding of solar wind-magnetosphere interactions on the basis of the statistical evaluation of the energy budget in the magnetosheath?
Sorriso-Valvo, Luca; Plaschke, Ferdinand; Nakamura, Rumi +6 more
Solar wind (SW) quantities, referred to as coupling parameters (CPs), are often used in statistical studies devoted to the analysis of SW–magnetosphere–ionosphere couplings. Here, the CPs and their limitations in describing the magnetospheric response are reviewed. We argue that a better understanding of SW magnetospheric interactions could be ach…
A Review of Instrument Techniques to Measure Magnetospheric Cold Electrons and Ions
Reisenfeld, Daniel B.; Maldonado, Carlos A.; Resendiz Lira, Pedro A. +3 more
A review of the instruments and techniques to directly measure the full distributions of the cold-ion and cold-electron populations in the magnetosphere is presented. Relatively few studies have focused on the cold plasma populations of the magnetosphere due to difficulties associated with obtaining measurements. The cold particle populations are …
Using machine learning to characterize solar wind driving of convection in the terrestrial magnetotail lobes
Glassmeier, Karl-Heinz; Halekas, Jasper S.; Haaland, Stein +2 more
In order to quantitatively investigate the mechanism of how magnetospheric convection is driven in the region of magnetotail lobes on a global scale, we analyzed data from the ARTEMIS spacecraft in the deep tail and data from the Cluster spacecraft in the near and mid-tail regions. Our previous work revealed that, in the lobes near the Moon's orbi…
A possible mechanism for the formation of an eastward moving auroral spiral
Grigorenko, Elena E.; Kronberg, Elena A.; Partamies, Noora +1 more
The generation process of auroral spirals is described by different theories varying for their morphology and surrounding conditions. Here, a possible mechanism is proposed for an eastward moving auroral spiral, which was observed in Tromsø, Norway, during the expansion phase of a substorm on 18 September 2013. Measurements from the THEMIS-A and C…