Observations of Low-Frequency Terrestrial Type III Bursts by Geotail and Wind and Their Association with Geomagnetic Disturbances Detected by Ground and Space-Borne Instruments

R. R. Anderson, D. A. Gurnett, H. Matsumoto, K. Hashimoto, H. Kojima, Y. Kasaba, M. L. Kaiser, G. Rostoker, J.-L. Bougeret, J.-L. Steinberg, I. Nagano, H. J. Singer.
Geophys. Res. Lett., submitted for publication, 1996.

In this report we examine a Low Frequency (LF) burst event observed by both the Geotail Plasma Wave Instrument (PWI) and the Wind Waves experiment while both spacecraft were in the upstream solar wind but at widely separated locations. At the same time the Polar PWI was at 6 RE over the northern auroral zone and provided the characteristics of auroral kilometric radiation (AKR) near its source region. These observations are correlated with the CANOPUS ground magnetometer data showing an isolated and moving geomagnetic disturbance near local midnight. In the magnetometer data for GOES 8, which was also near local midnight, we have found indications of enhanced field aligned currents and magnetic field dipolarization observed simultaneously with the strong LF burst event. These observations indicate an intimate relationship between AKR, geomagnetic storms, and LF bursts. We suggest that the dynamics of the geomagnetic disturbance may be responsible for some of the observed time dispersion in the LF bursts.