Identification

Title

Investigation of interhemispheric asymmetry of the thermospheric composition observed by GOLD during the first strong geomagnetic storm in solar-cycle 25, 1: IMF By effects

Abstract

An interhemispheric asymmetry of thermospheric Oxygen (O) to Nitrogen (N-2) column density ratio (Sigma O/N-2) variations was observed by the Global-scale Observations of the Limb and Disk (GOLD) during the 3-5 November 2021 geomagnetic storm. Sigma O/N-2 depletion is more equatorward in the local morning than in the local afternoon in the northern hemisphere (NH), while more equatorward in the local afternoon than the local morning in the southern hemisphere (SH). The Thermosphere Ionosphere Electrodynamics General Circulation Model simulations reproduced the observed Sigma O/N-2 asymmetry. The impacts of interplanetary magnetic field (IMF) east-west component (B-y) on the interhemispheric asymmetry of Sigma O/N-2 depletion was investigated. Comparisons of simulation results with and without real B-y show that the dominant positive IMF B-y results in the Joule heating maximum occurring in the local afternoon of NH and local morning in the SH during the storm initial phase, which generates the corresponding Sigma O/N-2 changes. Additionally, the IMF B-y during this storm are more crucial in the SH than in the NH. Without B-y, equatorward penetration of the Sigma O/N-2 depletion in GOLD Field of View are almost same in the SH. However, in the NH, there is still more equatorward depletion in the local morning than the local afternoon without B-y.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.org/ark:/85065/d77m0d0g

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

Text

originating controlled vocabulary

title

Resource Type

reference date

date type

publication

effective date

2016-01-01T00:00:00Z

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

publication

effective date

2023-10-30T00:00:00Z

Frequency of update

Quality and validity

Lineage

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Limitations on public access

None

Responsible organisations

Responsible party

contact position

OpenSky Support

organisation name

UCAR/NCAR - Library

full postal address

PO Box 3000

Boulder

80307-3000

email address

opensky@ucar.edu

web address

http://opensky.ucar.edu/

name: homepage

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact