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Investigations on Atmospheric Acceleration of Energetic Electrons by ERG and SCOPE

Investigations on Atmospheric Acceleration of Energetic Electrons by ERG and SCOPE. Wing-Huen Ip Institutes of Space Science and Astronomy National Central University March 17, 2009. Outline. TGFs TLEs Saturn: Extreme Electrostatic Charging

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Investigations on Atmospheric Acceleration of Energetic Electrons by ERG and SCOPE

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  1. Investigations on Atmospheric Acceleration of Energetic Electrons by ERG and SCOPE Wing-Huen Ip Institutes of Space Science and Astronomy National Central University March 17, 2009

  2. Outline • TGFs • TLEs • Saturn: Extreme Electrostatic Charging • Jupiter: Recirculation Process of MeV Electrons • Earth: The Russel-McPherron Effect • Space Weather

  3. Terrestrial Gamma-ray Flashes (TGFs)

  4. Terrestrail Gamma-ray Flashes:CGRO-BATSE Observations • NASA Compton Gamma-ray Observatory (CGRO) BATSE detected atmospheric gamma-ray bursts at 10’s MeV (Fishman et al. 1994) • Close association with thunderstorm and lightning activity (Inan et al., 1996) • Events lasted for a few mseconds to few tens of mseconds Fishman et al., Science, 264, 1313, 1994

  5. RHESSI observations of TGFs • RHESSI showed seasonal and geographic correlation of TGFs with lightning hot spots (Smith et al., 2005) Smith et al., Science, 307, 1085, 2005

  6. ~17% of TGFs detected by CGRO/BATSE have been reclassified to be 30 MeV electrons/positrons (Dwyer et al., 2008) Smith et al., Science, 307, 1085, 2005

  7. Theory • Relativistic runaway electron beams driven upward by intense QE field following positive cloud-to-ground discharges (Gurevich et al., Phys. Lett., A, 165, 463, 1992) • DC electric field ~ potential drop of about 30 MV (Tonev and Velinov, Adv. Space Res., 31, 1443, 2003)

  8. Transient Luminous Events(LTEs)

  9. First color image of a sprite http://sprite.phys.ncku.edu.tw/new/news/0626_presss/big_red_sprites_sentman_s.jpg

  10. Valdivia et al., GRL, 24, 3169, 1997

  11. Trapped relativistic electrons from lightning Lehtinen et al., GRL, 27, 1095, 2000

  12. Saturnian rings

  13. Formation of radial spokes Jones, et al. GRL, 33, L21202, 2006.

  14. Jones, et al. GRL, 33, L21202, 2006.

  15. Jovian synchrotron radiation http://www.atmos.ucla.edu/~bhattach/sr.gif

  16. Recirculation Model of Jovian Electrons Nishida, JGR, 81, 1771, 1976

  17. Fujimoto and Nishida, JGR, 95, 3840, 1990

  18. Earth’s magnetosphere http://farm4.static.flickr.com/3097/3128294877_2558320fbc.jpg

  19. Fujimoto and Nishida, JGR, 95, 4265, 1990

  20. The Russell-McPherron Effect Russell and McPherron, JGR, 78, 92, 1973

  21. Spacecraft charging http://sd-www.jhuapl.edu/UPOS/SCA/spacecraft-charging-assessment-final-report.pdf

  22. Thanks

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