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Observational Evidence and Formation Mechanism of Low-Density Cells in the Upper Thermosphere on September 8, 2017

Yuan, Liangliang and Jin, Shuanggen (2021) Observational Evidence and Formation Mechanism of Low-Density Cells in the Upper Thermosphere on September 8, 2017. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS. Wiley. doi: 10.1029/2020JA028915. ISSN 2169-9380.

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Abstract

The low-density cell structure in the high-latitude thermosphere is referred to as the density depletion with respect to the adjacent area. Based on Gravity Recovery and Climate Experiment (GRACE) accelerometer data during the September 2017 geomagnetic storms, the thermospheric mass density at about 350 km are estimated and further investigated especially in the high-latitude regions. At least two kinds of low-density cells over the Southern Hemisphere (SH) are observed along the GRACE orbit. To understand the low-density cell structures over the SH observed by GRACE, we investigate the underlying physical mechanism based on thermosphere-ionosphere numerical simulations using ThermosphereIonosphere Electrodynamic General Circulation Model and Global Ionosphere Thermosphere Model. According to the simulation results, the formation mechanism of the low-density cell is attributed to the storm-time vertical advection and horizontal velocity divergence driven by the auroral ion convection. The critical height of observable low-density cells is shown to be not less than 350 km. The meridional spatial scale of observed low-density cells over the SH are approximately or slightly larger than 1,500 km. Three low-density cells, including two in the dawn sector and one in the night sector were observed about 1 hour after the direction of interplanetary magnetic field BY component reversed. The occurrence of thermospheric low-density structure is essential to be included in the empirical model during geomagnetic storm time.

Item URL in elib:https://elib.dlr.de/145697/
Document Type:Article
Title:Observational Evidence and Formation Mechanism of Low-Density Cells in the Upper Thermosphere on September 8, 2017
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Yuan, Liangliangliangliang.yuan (at) dlr.dehttps://orcid.org/0000-0001-6711-107X
Jin, ShuanggenSchool of Remote Sensing and Geomatics Engineering, Nanjing University of Information Science and Technology, Nanjing, ChinaUNSPECIFIED
Date:2021
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1029/2020JA028915
Publisher:Wiley
ISSN:2169-9380
Status:Published
Keywords:Thermopshere, Density cell
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignment
DLR - Program:no assignment
DLR - Research theme (Project):no assignment
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Space Weather Observation
Deposited By: Yuan, Liangliang
Deposited On:02 Dec 2021 07:17
Last Modified:02 Dec 2021 07:17

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