On Constructing a Climatology of VLF from Lightning in LEO
Abstract
Starting from OTD/LIS lightning data representing 1995 - 2005 a climatology is constructed with 1°x1° latitude longitude spatial resolution, averaged into 2 hour bins for each month of the year. Assuming a linear relationship between optical flash rate and VLF power flux, and that the VLF amplitude drop off as one over the distance between lightning origin and satellite detection. A typical lightning spectrum is applied and then the values are scaled by an appropriate transionospheric absorption for each time and place. These values are mapped up the geomagnetic field lines to satellite altitudes and over to the satellite conjugate locations in order to compare them to E-field spectral densities measured by the DEMETER satellite between 2005 and 2009. An overview of the DEMETER survey mode data is presented which leads to a best scaling of the lightning VLF climatology. The final distributions spatial and temporal variations are compared with the DEMETER data and some implications are discussed.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFMAE21A0238C
- Keywords:
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- 3324 ATMOSPHERIC PROCESSES / Lightning;
- 3320 ATMOSPHERIC PROCESSES / Idealized model