Identification

Title

Seasonal and latitudinal differences of the saturation effect between ionospheric NmF2 and solar activity indices

Abstract

The seasonal and latitudinal differences of the correlations between daytime ionospheric F 2 peak electron density (N m F 2) and solar activity indices in the east Asian/Australian sector have been analyzed using data from 15 ionosonde stations at different geomagnetic latitudes during 1969˜1990. It is found that the characteristics of the correlations between N m F 2 and solar activity indices have significant seasonal and latitudinal variations and hemispheric asymmetry. At middle and high latitudes, there is a clear saturation trend in N m F 2 as solar activity increases in summer. However, there is no apparent saturation trend in winter, rather a tendency of nonlinear increase of N m F 2 with solar activity. This nonlinear increasing effect is more pronounced in the Northern Hemisphere. In the equatorial anomaly region, the saturation effect is stronger, and the equinox has the strongest saturation effect. All seasons considered, the equatorial anomaly region has the strongest saturation effect, followed by the magnetic equatorial region. The saturation effect becomes relatively weak at middle latitudes. At higher latitudes and in the Northern Hemisphere, there is even a trend of nonlinear increase of N m F 2 with solar activity. Our results indicate that thermospheric global circulation is probably an important factor that introduces seasonal, latitudinal, and north-south differences in the correlations between N m F 2 and solar activity indices.

Resource type

document

Resource locator

Unique resource identifier

code

https://n2t.org/ark:/85065/d7x34zgx

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

2009-10-09T00:00:00Z

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