Estimation of ionospheric electric fields and currents from a regional magnetometer array
Journal Article
·
· J. Geophys. Res.; (United States)
We investigate the technique of calculating ionospheric electric fields and currents and field-aligned currents using an equivalent current function obtained from a regional array of ground-based magnetometers at high latitudes (Scandinavian Magnetometer Array). Like similar calculations previously done on a global scale, the derived electric fields and currents are found to depend on the model of ionospheric conductivity assumed. Unlike the global scale calculations, the regional calculations are also dependent on the assumed boundary conditions. Additional information on the electric fields, currents, and/or conductivities is required, besides the ground magnetic variations, to obtain unique estimations of the ionospheric electrodynamic features. In the present case, ionospheric drift measurements from one of the Scandinavian Twin Auroral Radar Experiment radars help constrain the calculations. Analysis of an equivalent current function at 1835 UT on October 7, 1976, representing Harang discontinuity conditions, suggests that upward field-aligned current probably existed near the boundary between eastward and westward electrojets.
- Research Organization:
- National Center for Atmospheric Research, Boulder, Colorado
- OSTI ID:
- 5476213
- Journal Information:
- J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 90:A4; ISSN JGREA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Joint two-dimensional observations of ground magnetic and ionospheric electric fields associated with auroral zone currents 1. Three-dimensional current flows associated with a substorm-intensified eastward electrojet
Field-aligned current flow associated with intrusion of the substorm-intensified westward electrojet into the evening sector
Modeling substorm current sytems using conductivity distributions inferred from DE (Dynamics Explorer) auroral images
Journal Article
·
Thu May 01 00:00:00 EDT 1980
· J. Geophys. Res.; (United States)
·
OSTI ID:5336476
Field-aligned current flow associated with intrusion of the substorm-intensified westward electrojet into the evening sector
Journal Article
·
Mon Sep 01 00:00:00 EDT 1975
· Journal of Geophysical Research
·
OSTI ID:4161151
Modeling substorm current sytems using conductivity distributions inferred from DE (Dynamics Explorer) auroral images
Technical Report
·
Wed Oct 01 00:00:00 EDT 1986
·
OSTI ID:7060188
Related Subjects
640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOUNDARY CONDITIONS
CALCULATION METHODS
CURRENTS
DATA
EARTH ATMOSPHERE
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
IONOSPHERE
MAGNETOMETERS
MEASURING INSTRUMENTS
NUMERICAL DATA
PHYSICAL PROPERTIES
PLANETARY IONOSPHERES
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOUNDARY CONDITIONS
CALCULATION METHODS
CURRENTS
DATA
EARTH ATMOSPHERE
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
IONOSPHERE
MAGNETOMETERS
MEASURING INSTRUMENTS
NUMERICAL DATA
PHYSICAL PROPERTIES
PLANETARY IONOSPHERES