Identification

Title

Latitudinal variations of middle thermosphere: Observations and modeling

Abstract

Ching and Carter (1974) reported an equatorial bugle of midnight mass density at about 230 km on the basis of ion gauge measurements in April 1972. However, since then few succeeding studies of the variation of equatorial mass density in this region have been pursued. In this report, observations from the Satellite Electrostatic Triaxial Accelerometer (SETA) satellite during 1 September 1983 to 31 October 1983 are used to examine the variations of the equatorial density at around 210 km for the daytime (1030 LT) and nighttime (2230 LT) sectors. It is found that mass densities show an equatorial trough around the geographic equator and two crests aside the trough during both daytime and nighttime. The thermosphere-ionosphere-mesosphere-electrodynamics general circulation model (TIMEGCM) reproduces the features seen in the SETA data. Our simulation reveals that the observed double-hump structures in both daytime and nighttime sectors are mainly associated with the tides excited locally in the lower and middle thermosphere region, although they are modulated by the tides originating from the lower atmosphere.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.org/ark:/85065/d7kp82wt

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

2011-12-06T00:00:00Z

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