Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1484b&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1484
Other
2704 Auroral Phenomena (2407), 2716 Energetic Particles: Precipitating, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2774 Radiation Belts, 3304 Atmospheric Electricity
Scientific paper
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. Two balloons were launched for the purpose of upper atmosphere physics observation. More than 20 days of simultaneous fair weather 3-axis electric field and stratospheric conductivity data were obtained at geomagnetic latitudes ranging from sub-auroral to the polar cap. A very pronounced negative ion conductivity enhancement was observed by one balloon but not the other at 32 km in the stratosphere on 27 January 2003 from 1500 to 2200 UT. During this event, the conductivity doubled for an interval of about 7 hours. 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 energetic proton precipitation as a possible magnetosphere-stratosphere coupling mechanism responsible for the conductivity enhancement. Such precipitation is consistent with the wave data. Precipitating > 16 Mev proton precipitation was observed by the Akebono and NOAA POES spacecraft. This paper will explore the relationship between the wave data, the proton observations and stratospheric electrodynamics. 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. The observations show that an electrified Southern Ocean storm and associated electrodynamic perturbations occurred during major perturbations in stratospheric conductivity driven by an auroral disturbance. This event might represent a hitherto unrecognized source of modulation of the global circuit current.
Bering Edgar A.
Engebretson Mark J.
Holzworth Robert H.
Kadokura Akira
Kokorowski Michael
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