HR: 1340h
AN: AE23A-0994 [Abstracts]
TI: Elves spectrum based on the ISUAL photometric data
AU: * Kuo, C
EM: johnny@phys.ncku.edu.tw
AF: National Cheng Kung University, No.1, Ta-Hsueh Road, Tainan, 701
Taiwan
AU: Chen, B
EM: alfred@phys.ncku.edu.tw
AF: National Cheng Kung University, No.1, Ta-Hsueh Road, Tainan, 701
Taiwan
AU: Hsu, R
EM: rrhsu@phys.ncku.edu.tw
AF: National Cheng Kung University, No.1, Ta-Hsueh Road, Tainan, 701
Taiwan
AU: Su, H
EM: htsu@phys.ncku.edu.tw
AF: National Cheng Kung University, No.1, Ta-Hsueh Road, Tainan, 701
Taiwan
AU: Lee, L
EM: loulee@narl.org.tw
AF: National Applied Research Laboratories, 3F, No. 106, Ho-Ping E. Road, Sec. 2, Taipei, 106
Taiwan
AU: Mende, S
EM: mende@ssl.berkeley.edu
AF: Space Sciences Lab,
University of California, Berkeley, Centennial Drive at Grizzly Peak Boulevard, Berkeley, 94720-7450
United States
AU: Frey, H
EM: hfrey@ssl.berkeley.edu
AF: Space Sciences Lab,
University of California, Berkeley, Centennial Drive at Grizzly Peak Boulevard, Berkeley, 94720-7450
United States
AU: Fukunishi, H
EM: fuku@pat.geophys.tohoku.ac.jp
AF: Department of Geophysics, Tohoku University, Aramaki-aoba, Aoba-ku, Sendai, 980-8578
Japan
AU: Takahashi, Y
EM: yukihiro@pat.geophys.tohoku.ac.jp
AF: Department of Geophysics, Tohoku University, Aramaki-aoba, Aoba-ku, Sendai, 980-8578
Japan
AB:
Elves are lower ionospheric optical emissions induced by lightnings' electromagnetic pulses (EMP) [Inan et al., 1996;
Fukunishi et al, 1996]. Their short luminous duration (~1 msec) and low brightness (0.1-1 MR) severely limit the success in
obtaining the spectroscopic infromation from ground-based observations [Barrington-Leigh and Inan, 2001]. With the launch of
ISUAL payload on the FORMOSAT-2 satellite, a new opportunity has opened up to elucidate the nature of the fleeting elves.
From the recorded ISUAL events, the following characteristics of elves have been obtained (1) the existence of highly
absorbed Lyman-Birge-Hopfield band and ionized 1NN2+ band, (2) a higher brightness of ~40 mega-Rayleigh at 1PN2 band, and (3)
an associated E-field of 15 Volt/m at 90 km.
Using the ISUAL spectrophotometric data (SP1 at 150-290 nm, SP2 centered at 337 nm, SP3 cetered at 391.4 nm, SP4 at
608.9-753.4 nm, SP6 at 228.2-410.2 nm; 0.1 ms time resolution) and Array Photometer data (blue band 370-450 nm, red band
530-650 nm; 0.05 ms time resolution), 57 hehind-the-limb elves with their parent lightning blocked by the solid Earth are
analyzed. The possible spectrum of elves will be proposed.
DE: 2423 Ionization processes (7823)
DE: 2427 Ionosphere/atmosphere interactions (0335)
DE: 3324 Lightning
SC: Atmospheric and Space Electricity [AE]
MN: Fall Meeting 2005