Ps 6 spatial and temporal structure from STARE and riometer observations

Details Ps 6 spatial and temporal structure from STARE and riometer observations Ps 6 spatial and temporal structure from STARE and riometer observations

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.8157n&link_type=abstract

Journal of Geophysical Research, vol. 87, Oct. 1, 1982, p. 8157-8165.

Astronomy and Astrophysics

Astronomy

20

Auroral Zones, Geomagnetic Pulsations, Ionospheric Currents, Ionospheric Drift, Magnetic Disturbances, Riometers, Auroral Electrojets, Earth Magnetosphere, Electric Fields, Electron Density (Concentration), Electron Precipitation, Field Aligned Currents, Hall Effect, Magnetic Flux, Radar Astronomy, Spatial Resolution, Temporal Distribution

Scientific paper

It is noted that during ground-based observations of Ps 6 events, the two-dimensional electron drift velocity maps (or the corresponding electric field maps) deduced from the Scandinavian twin auroral radar experiment (STARE) measurements exhibit a characteristic wavelike oscillation pattern. The electric field divergence suggests the presence of an east-west field-aligned current (FAC) pair, the more spatially confined leading FAC being downward, the more broadly spread following FAC being upward. A multiple narrow beam 51.4-MHz riometer gives evidence of a broad absorption zone associated with the trailing upward FAC. Using the Biot-Savart law to integrate the magnetic flux density due to the STARE velocity vectors (elemental currents) and comparing the result with the ground-based magnetometer records, it can be inferred that the closure current for the FAC pair has both Pedersen and Hall components, thereby indicating the presence of conductivity gradients.

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