Identification

Title

Hemispheric asymmetry of the vertical ion drifts at dawn observed by DMSP

Abstract

Based on the measurements from Defense Meteorological Satellite Program (DMSP) F12, F13, and F15 satellites in 1995-2014, we report significant hemispheric asymmetries in vertical ion drift velocity (V-z) at dawn (0500-0700 solar local time) in geomagnetic and geographic coordinates. V-z is distributed in 0300-0900 magnetic local time sector in both the northern (NH) and southern (SH) hemispheres. The north-south asymmetries are persistent no matter under what kind of seasonal, solar activity, and IMF conditions. In the polar cap, downward V-z is stronger in the SH. Such difference shows clear IMF B-Y dependence and is more significant in the local winter and/or under low solar activity conditions. In the geomagnetic coordinates, the auroral zone is dominated by upward V-z in the NH but by downward V-z in the SH statistically. In the geographic coordinates, the geographic longitudinal variation of V-z is more pronounced in the SH. The seasonal variations of high-latitude V-z are different in the NH and SH. The average asymmetric feature of V-z largely depends on the occurrence and magnitude of ion upflow/outflow, which are modulated by the combined effects of the asymmetric magnetic field configuration between the two hemispheres, and the dynamic processes in the tightly coupled ionosphere-thermosphere system, and their (probably nonlinear) interactions with each other.

Resource type

document

Resource locator

Unique resource identifier

code

http://n2t.net/ark:/85065/d7319zw2

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

2018-12-04T00:00:00Z

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