Slow Contraction of Flash Aurora Induced by an Isolated Chorus Element Ranging From Lower‐Band to Upper‐Band Frequencies in the Source Region
Slow Contraction of Flash Aurora Induced by an Isolated Chorus Element Ranging From Lower‐Band to Upper‐Band Frequencies in the Source Region
复制标题
源区域中从低频带到高频带频率范围内的孤立合唱元素引起的闪光极光的缓慢收缩
DOI:
10.1029/2021gl097597
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发表时间:
2022
影响因子:
5.2
通讯作者:
Imamura, Kousuke
中科院分区:
文献类型:
--
作者:
Ozaki, Mitsunori;Yagitani, Satoshi;Shiokawa, Kazuo;Tanaka, Yoshimasa;Ogawa, Yasunobu;Hosokawa, Keisuke;Kasahara, Yoshiya;Ebihara, Yusuke;Miyoshi, Yoshizumi;Imamura, Kousuke
Flash aurora driven by an isolated chorus element can be a useful ionospheric indicator for identifying the source wave properties via wave‐particle interactions. Using ground observation and modeling approaches, here we report the temporal characteristics of flash aurora that depend on the chorus frequency width and the sweep rate. We found that the contraction time increases more than the expansion time in patchy auroral variations, due to the difference in the minimum electron energies resonated with the chorus wave packet away from the equatorial source to higher latitudes. Especially, the contraction time strongly depends on the higher‐frequency chorus waves due to cyclotron resonance with lower‐energy electrons. The model calculations support that the chorus element ranges from lower‐band to upper‐band frequencies with respect to half the gyrofrequency at the exact generation region. Our study provides the prompt (milliseconds) chorus‐driven electron dynamics through the spatiotemporal characteristics of flash aurora in the ionosphere.
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影响因子:
5.2
作者:
X. Shen;Wen Li;Q. Ma;O. Agapitov;Y. Nishimura
通讯作者:
X. Shen;Wen Li;Q. Ma;O. Agapitov;Y. Nishimura
影响因子:
10.6
作者:
Li, Chunming;Xu, Chenyang;Fox, Martin D.
通讯作者:
Fox, Martin D.
DOI:
--
发表时间:
1978
期刊:
影响因子:
--
作者:
T. Oguti
通讯作者:
T. Oguti
影响因子:
16.6
作者:
Jinxing Li;J. Bortnik;X. An;Wen Li;V. Angelopoulos;R. Thorne;C. Russell;B. Ni;X. Shen
通讯作者:
Jinxing Li;J. Bortnik;X. An;Wen Li;V. Angelopoulos;R. Thorne;C. Russell;B. Ni;X. Shen
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
K. Yamaguchi;T. Matsumuro;Y. Omura;D. Nunn
通讯作者:
D. Nunn