Impact of lithium releases on ionospheric electron density observed by impedance probe during WIND campaign

被引:6
作者
Uemoto, Jyunpei [1 ]
Ono, Takayuki [2 ]
Yamada, Tomohisa [3 ]
Suzuki, Tomonori [2 ]
Yamamoto, Masa-Yuki [3 ]
Watanabe, Shigeto [4 ]
Kumamoto, Atsushi [2 ]
Iizima, Masahide [5 ]
机构
[1] Natl Inst Informat & Commun Technol, Koganei, Tokyo 1848795, Japan
[2] Tohoku Univ, Grad Sch Sci, Sendai, Miyagi 9808578, Japan
[3] Kochi Univ Technol, Grad Sch Engn, Kochi 7828502, Japan
[4] Hokkaido Univ, Div Earth & Planetary Sci, Sapporo, Hokkaido 0600810, Japan
[5] Daijo Syukutoku Gakuen, Tokyo 1748645, Japan
来源
EARTH PLANETS AND SPACE | 2010年 / 62卷 / 07期
关键词
Ionosphere; impedance probe; electron density; chemical release; EXPANSION CHARACTERISTICS; SATELLITE; CLOUDS; ELECTRODYNAMICS; MIDLATITUDE; LAYER;
D O I
10.5047/eps.2010.07.001
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
This paper presents direct observation of the impact of the lithium releases on the ionospheric electron density during the WIND (wind measurement for ionized and neutral atmospheric dynamics study) campaign conducted on 2 September 2007 in Japan. The direct observation is unique in that the electron density enhancement was observed by using the NEI (number density of electrons by impedance probe) which can measure accurately the absolute value of the electron density, and the distance between the NEI and the LES (lithium ejection system) was very close (several tens of meters). Data analyses of the NEI on-board the sounding rocket S-520-23, which was launched from Uchinoura (31.3 degrees N, 131.1 degrees E) at 19: 20 JST (JST = UT + 9 h), clarifies that lithium releases performed in the descending phase increased the electron density up to approximately 7 x 10(5) cm(-3). A simple model calculation performed under the assumption that the increased electron density equals the photoionized lithium ion density indicates that the observed electron density enhancements cannot be explained by considering each lithium release as an instantaneous one, but rather by considering a convolution of very short-time intermittent releases. The model calculation is verified by comparison with the observation of the lithium resonance scattering light from the ground.
引用
收藏
页码:589 / 597
页数:9
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