Physics
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3618808a&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 18, CiteID L18808
Physics
2
Atmospheric Processes: Lightning, Atmospheric Processes: Atmospheric Electricity, Atmospheric Processes: Remote Sensing, Atmospheric Processes: Instruments And Techniques
Scientific paper
From July 2004 to June 2007, the FORMOSAT-2/ISUAL spectrophotometer and Duke magnetometer observed clear optical and radio signatures of 12 sprite-producing lightning events. In 10 of these, 777.4-nm luminosity normalized to a distance of 3000 km was almost linearly correlated with current moment with a scaling factor of ˜0.82 MR/kAkm. This finding provides a possible new way to remotely measure lightning current moment, which is critical for understanding the production of sprites, through satellite-based optical measurements. The remaining 2 events had anomalously large scaling factors of ˜3 and ˜8 MR/kAkm. The concurrent images showed two coincident bright cores of lightning, which suggests complex in-cloud lightning processes may sometimes affect the optical-radio relationship.
Adachi Toru
Chen Alfred B.
Cummer Steven A.
Frey Harald U.
Hsu Rue-Ron
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