Identification

Title

Early morning equatorial ionization anomaly from GOLD observations

Abstract

During geomagnetically quiet and solar minimum conditions, spatial variations of the early morning thermosphere-ionosphere (TI) system are expected to be mainly governed by wave dynamics. To study the postmidnight dynamical coupling, we investigated the early morning equatorial ionization anomaly (EIA) using Global-scale Observations of the Limb and Disk (GOLD) measurements of OI-135.6 nm nightglow emission and global navigation satellite system (GNSS)-based total electron content (TEC) maps. The EIA structures in the OI-135.6 nm emission over the American landmass resemble, spatially and temporally, those observed in the GNSS-TEC maps. The early morning EIA (EM-EIA) crests are well separated in latitude and mostly located over the middle of South America during October-November. In February-April the crests are less separated in latitude and predominantly located over the west coast sector of South America. Whole Atmosphere Community Climate Model with thermosphere and ionosphere eXtension (WACCMX) simulations with constant solar minimum and quiet-geomagnetic conditions show that EM-EIA can occur globally and shows properties similar to longitudinal Wave 4 pattern. Thus, we propose that EM-EIA is driven by dynamical changes associated with the lower atmospheric waves.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7z89gpr

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

2020-07-09T00:00:00Z

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