Simultaneous observations of Pc 1 micropulsation activity and stratospheric electrodynamic perturbations on 27 January 2003 |
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Authors: | E Bering M Engebretson R Holzworth A Kadokura M Kokorowski B Reddell J Posch H Yamagishi |
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Institution: | 1. Physics Department, University of Houston, 617 Science and Research Building I, Houston, TX 77204-5005, USA;2. Department of Electrical and Computer Engineering, University of Houston, N-308 Engineering Building 1, Houston, TX 77204-4005, USA;3. Physics Department, Augsburg College, 2211 Riverside Drive, Minneapolis, MN 55454, USA;4. Earth and Space Sciences, University of Washington, Room 230 Condon Hall, Seattle, WA 98195-1310, USA;5. National Institute of Polar Research, 9-10 Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan |
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Abstract: | The 2nd Polar Patrol Balloon campaign (2nd-PPB) was carried out at Syowa Station in Antarctica during 2002–2003. Identical stratospheric balloon payloads were launched as close together in time as allowed by weather conditions to constitute a cluster of balloons during their flights. A very pronounced negative ion conductivity enhancement was observed at 32 km in the stratosphere below the auroral zone on 27 January 2003 from 1500 to 2200 UT. During this event, the conductivity doubled for an interval of about 7 h. This perturbation was associated with an extensive Pc 1 or Pi 1 wave event that was observed by several Antarctic ground stations, balloon PPB 10, and the Polar spacecraft. No appreciable X-ray precipitation was observed in association with this event, which would point to >60 Mev proton precipitation as a possible magnetosphere–stratosphere coupling mechanism responsible for the conductivity enhancement. Such precipitation is consistent with the wave data. During the latter half of the event, Ez was briefly positive. There was a tropospheric Southern Ocean storm system underneath the balloon during this interval. If the event was associated with this storm system and not energetic proton precipitation, the observations imply an electrified Southern Ocean storm and major perturbations in stratospheric conductivity driven by a tropospheric disturbance. This event represents a poorly understood source for global circuit current. Precipitating energetic proton data from Akebono and NOAA POES spacecraft show significant >16 MeV precipitation was occurring at the location of PPB 8 but not PPB 10, suggesting that proton precipitation was, in fact, the responsible coupling mechanism. |
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Keywords: | Stratospheric conductivity MeV proton precipitation Antarctic Balloon Electrified extra-tropical cyclone |
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