Electric field measurements in a major magnetospheric substorm

Details Electric field measurements in a major magnetospheric substorm Electric field measurements in a major magnetospheric substorm

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.3181k&link_type=abstract

Journal of Geophysical Research, vol. 80, Aug. 1, 1975, p. 3181-3195.

Computer Science

Sound

2

Barium Ion Clouds, Electric Fields, Magnetic Storms, Magnetospheric Instability, Rocket Sounding, Electrical Measurement, Field Aligned Currents, Geomagnetism, Ionospheric Currents, Polar Substorms

Scientific paper

A Black Brant VB sounding rocket was launched on August 17, 1970 into the expansion phase of a major magnetospheric substorm during which the perturbation magnetic field was in excess of 2000 gammas at ground level. Measurements of the electric field component perpendicular to the earth's magnetic field made by double-probe detectors on board the rocket and by observation of the motion of two barium ion clouds released from the same rocket were in excellent agreement. These measurements show that the electric field is not always smallest inside auroral arcs and that the poleward auroral expansion phase is not accompanied by poleward ionospheric plasma motion; they suggest a divergence of the northward perpendicular ionospheric current and hence that a downward field-aligned current was present in the equatorward portion of the arc structure. During a portion of the flight the double-probe detectors also measured a parallel component of electric field between 10 and 24 mV/m which pointed downward toward the earth.

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