Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1485p&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1485
Physics
2700 Magnetospheric Physics (6939), 2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling
Scientific paper
Comparison of VLF experimental observations of LEP events with a comprehensive model of lightning-induced electron precipitation and the resulting ionospheric disturbance allows the measurement of such events with unprecedented quantitative detail. We examine the use of VLF remote sensing to quantitatively measure the precipitating flux associated with two representative LEP events. Observations of VLF signal perturbations recorded on the Holographic Array for Ionospheric/Lightning Research (HAIL) are interpreted using a comprehensive model of lightning-induced electron precipitation. The model consists of three major components: a test-particle model of the gyroresonant whistler-induced electron precipitation [Borntik et al., 2006]; a Monte Carlo simulation of the energy deposition into the ionosphere resulting from the calculated precipitation flux [Lehtinen, 2001]; and a model of VLF subionospheric signal propagation that takes into account the disturbed ionospheric density profiles [Chevalier and Inan, 2006]. For both cases, the model predicts VLF signal amplitude and phase perturbations within a factor of three of those observed, within the expected variability in trapped energetic flux levels. The modeled, precipitated energy flux (E>45 keV) peaks at ~1×10-2 [ergs s-1 cm-2], resulting in a peak loss of ~0.001% from a single flux tube at L~2.2, consistent with previous satellite measurements of LEP events [Voss et al., 1998]. A metric for quantitative interpretation of VLF signal perturbations in terms of precipitated electron flux is presented. A conversion metric ψ, relating VLF signal amplitude perturbations to the time-integrated precipitation flux (100-300 keV) along the VLF signal path, of 1.1±0.2×1010 [el m-1/dB] is suggested for precipitation events of similar location and characteristics to the events examined in this work. Preliminary work on the occurrence rates of LEP events is also presented.
Inan Umran
Peter William
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