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Investigations on Atmospheric Acceleration of Energetic
Electrons by ERG and SCOPE
Wing-Huen IpInstitutes of Space Science and Astron
omyNational Central University
March 17, 2009
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Outline
• TGFs• TLEs• Saturn: Extreme Electrostatic Charging • Jupiter: Recirculation Process of MeV Elec
trons • Earth: The Russel-McPherron Effect• Space Weather
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Terrestrial Gamma-ray Flashes (TGFs)
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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
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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
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• ~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
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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)
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Transient Luminous Events(LTEs)
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First color image of a sprite
http://sprite.phys.ncku.edu.tw/new/news/0626_presss/big_red_sprites_sentman_s.jpg
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Valdivia et al., GRL, 24, 3169, 1997
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Trapped relativistic electrons from lightning
Lehtinen et al., GRL, 27, 1095, 2000
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Saturnian rings
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Formation of radial spokes
Jones, et al. GRL, 33, L21202, 2006.
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Jones, et al. GRL, 33, L21202, 2006.
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Jovian synchrotron radiation
http://www.atmos.ucla.edu/~bhattach/sr.gif
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Recirculation Model of Jovian Electrons
Nishida, JGR, 81, 1771, 1976
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Fujimoto and Nishida, JGR, 95, 3840, 1990
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Earth’s magnetosphere
http://farm4.static.flickr.com/3097/3128294877_2558320fbc.jpg
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Fujimoto and Nishida, JGR, 95, 4265, 1990
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The Russell-McPherron Effect
Russell and McPherron, JGR, 78, 92, 1973
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Spacecraft charging
http://sd-www.jhuapl.edu/UPOS/SCA/spacecraft-charging-assessment-final-report.pdf
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Thanks