Seasonal dependence of LEP observed on DEMETER Erin S. Gemelos 1, Umran S. Inan 1, Martin Walt 1, Jean-Andre Sauvaud 2, Michel Parrot 3 February 18, 2009.

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Presentation transcript:

Seasonal dependence of LEP observed on DEMETER Erin S. Gemelos 1, Umran S. Inan 1, Martin Walt 1, Jean-Andre Sauvaud 2, Michel Parrot 3 February 18, STAR Laboratory, Stanford University, USA 2 CESR/CNRS, Toulouse, France 3 LPCE/CNRS, Orléans, France

Motivation  Lightning-induced electron precipitation (LEP) an important loss process at L<2.5  Ground measurements: ionospheric effects of LEP observed via associated D-region ionization (e.g. Inan et al., 1988; Peter and Inan, 2004)  In-situ measurements  Stimulated Emissions of Energetic Particles (SEEP): measurements of LEP into the loss cone [Voss et al., 1984]  DEMETER detection of LEP in the loss cone [Inan et al., 2007]  Goal: Long term effect of lightning and drift loss cone enhancements using in-situ data

Outline  (Motivation)  DEMETER  Lightning and wave data  Seasonal precipitation  Conclusions

DEMETER  730 km sun-synchronous orbit  10:30 or 22:30 local time  Instrument for Particle Detection (IDP)  Measures local pitch angles near 90, ~30 degree detector width  4/1 second resolution (survey/burst mode)  ~20/10 keV spectral resolution (survey/burst mode) in range 70keV – 2.35 MeV  Istrument Capteur Electrique (ICE)  VLF power spectrum (1 E component)

Energy Resonance

Energy Resonance [Blake et al., 2001]

Resonant Energy [Inan et al., 2007]

Fluxes and Lightning

Seasonal Lightning

Seasonal Fluxes

Seasonal Variation

U.S. unique  Location in drift loss cone

US unique  Location in drift loss cone  Geomagnetic conjugate in ocean

US unique  Location in drift loss cone  Geomagnetic conjugate in ocean  VLF wave activity Courtesy of M. Parrot [UNPUBLISHED RESULT]

Seasonal Fluxes over Pacific

Seasonal fluxes over U.S. Conjugate

Conclusions  Drift loss cone observations  Seasonal variation consistent with LEP  US uniquely located

Global difference