Theoretical prediction of longitude dependence of electron precipitation due to lightning

Details Theoretical prediction of longitude dependence of electron precipitation due to lightning Theoretical prediction of longitude dependence of electron precipitation due to lightning

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1582c&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1582

Physics

Plasma Physics

[7867] Space Plasma Physics / Wave/Particle Interactions, [7984] Space Weather / Space Radiation Environment

Scientific paper

Observations of Lightning-induced Electron Precipitation (LEP) events in the United States have consistently shown the onset delay between a causative lightning stroke and the onset of an LEP event to be longer (by ~0.5 seconds) than predicted. At locations such as the Western and Central United States, the southern hemisphere loss cone is significantly wider than the corresponding northern hemisphere loss cone so that any electrons scattered by northern hemisphere lightning will sometimes not experience sufficient pitch angle scattering to reach the northern hemisphere loss cone. Rather, the electron distribution will first mirror in the north, and become incident on the southern hemisphere atmosphere at a grazing incidence angle, experience an isotropization of pitch angles and then return to the northern hemisphere where the effects can be observed. To determine the importance of this atmospheric backscattering with regard to the observed characteristics of LEP events, we have employed a comprehensive Monte Carlo model of energetic electron interactions with the atmosphere which tracks the full cyclotron motion of incident electrons to determine the pitch angle diffusion for all incident angles from grazing incidence to deep within the loss cone. With this model we are able to predict longitude-dependent precipitation signatures for any mid-latitude location including longitudes and hemispheres at which LEP will be most prevalent, as well as longitudes where LEP will be very rare.

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