The results from the 1999 sprites balloon campaign

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Sprites, 1999 Balloon Campaign, Stratospheric Electromagnetic Fields

Scientific paper

A balloon campaign was conducted in summer, 1999, to measure the stratospheric electromagnetic fields associated with sprites. This paper will summarize some of the salient results of this work. The balloon payloads were instrumented with electric field detectors, magnetometers, an upward looking photometer, and other instruments. Ground observations for detection of sprites included low light level TV (LLTV) observations from three sites, Jelm Mt, WY, Bear Mt, SD, and Yucca Ridge, CO. The disagreements between models and these data will be discussed. We have used the photometer data to find TLEs by checking the trace at the times of cloud to ground (CG) strokes reported by the US National Lightning Detection Network (NLDN). In total numbers, the number of -CG transient luminous events (TLEs) (presumably all halos) predominates over the number of +CG TLEs. On the positive side, the TLE events show a current moment threshold. Inclusion of the -CG events that are not seen from the ground raises mesospheric power input estimates by a factor of ~5-7. Including the mesospheric effect of CGs not associated with TLEs increases this estimate by a factor of 2.

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