Identification

Title

Investigation of the post-sunset extra electron density peak poleward of the Equatorial Ionization Anomaly southern crest

Abstract

The Global-scale observation of limb and disk mission observed an extra electron density (Ne) peak after sunset at approximately 30 degrees S near 40 degrees W on 4 November 2019, which is poleward and immediately next to the southern equatorial ionization anomaly (EIA) crest. This Ne peak is different from previously reported mid-latitude peaks that occur at all local times. The Whole Atmosphere Community Climate Model-eXtended captures this phenomenon. Model diagnostic analysis reveals that the decrease of Ne and hmF2 between 15 degrees and 25 degrees S makes Ne near 30 degrees S appear as an extra density peak relative to the southern EIA crest. Transport by poleward meridional wind decreases Ne between 15 degrees and 25 degrees S. Moreover, the upward E x B drifts due to pre-reversal enhancement lift the plasma between the dip equator and 15 degrees S but do not affect Ne much between 15 degrees and 25 degrees S with a low drift speed. Comparison with days without the extra peak shows the importance of E x B drift latitudinal variations on the extra peak formation. This study provides new insights into the dynamic variability of the nighttime ionosphere.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7sn0drn

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

2022-10-30T00:00:00Z

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