The localization of Pi 2 pulsations - Ground-satellite observations

Physics – Geophysics

Scientific paper

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Earth Magnetosphere, Geomagnetic Micropulsations, Satellite Observation, Geosynchronous Orbits, Goes Satellites, Ground Stations, Magnetic Disturbances, Magnetic Signatures, Picosecond Pulses

Scientific paper

Simultaneous Pi 2 ground observations using the U.S. Air Force Geophysics Laboratory (AFGL) magnetometer network as well as space observations with the GOES 2 and 3 satellites are presented which indicate that the Pi 2 signal in space is often localized in such a way that synchronous satellites separated by 30 deg see very different field signatures. By contrast, on the ground at midlatitudes, similar features are often observed across the 60 deg width of the AFGL magnetometer network. In addition, when Pi 2's occur, as indicated by ground observations, their appearance at synchronous orbit near midnight is more likely during times of large rather than small K(p). These results are interpreted in terms of the plasma sheet model, which has been used to explain some of the Pi 2 pulsation properties.

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