Mesospheric ionization during substorm growth phase

被引：3

作者：

Murase, Kiyoka ^{[1
]}

Kataoka, Ryuho ^{[1
,2
]}

Nishiyama, Takanori ^{[1
,2
]}

Nishimura, Koji ^{[10
]}

Hashimoto, Taishi ^{[1
,2
]}

Tanaka, Yoshimasa ^{[1
,2
,3
]}

Kadokura, Akira ^{[1
,2
,3
]}

Tomikawa, Yoshihiro ^{[1
,2
]}

Tsutsumi, Masaki ^{[1
,2
]}

Ogawa, Yasunobu ^{[1
,2
]}

Uchida, Herbert Akihito ^{[5
]}

Sato, Kaoru ^{[4
]}

Kasahara, Satoshi ^{[4
]}

Mitani, Takefumi ^{[5
]}

Yokota, Shoichiro ^{[6
]}

Hori, Tomoaki ^{[7
]}

Keika, Kunihiro ^{[4
]}

Takashima, Takeshi ^{[5
]}

Kasahara, Yoshiya ^{[8
]}

Matsuda, Shoya ^{[8
]}

Shoji, Masafumi ^{[7
]}

Matsuoka, Ayako ^{[9
]}

Shinohara, Iku ^{[5
]}

Miyoshi, Yoshizumi ^{[7
]}

Sato, Tatsuhiko ^{[12
]}

Ebihara, Yusuke ^{[10
]}

Tanaka, Takashi ^{[11
]}

机构：

[1] Grad Univ Adv Studies, Dept Polar Sci, SOKENDAI, Tachikawa, Tokyo 1908518, Japan

[2] Natl Inst Polar Res, Tachikawa, Tokyo 1908518, Japan

[3] Res Org Informat & Syst, Polar Environm Data Sci Ctr, Tachikawa, Tokyo 1050001, Japan

[4] Univ Tokyo, Dept Earth & Planetary Sci, Bunkyo Ku, Tokyo 1130032, Japan

[5] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2525210, Japan

[6] Osaka Univ, Grad Sch Sci, Toyonaka, Osaka 5600043, Japan

[7] Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi 4648601, Japan

[8] Kanazawa Univ, Grad Sch Nat Sci & Technol, Kakuma, Ishikawa 9201192, Japan

[9] Kyoto Univ, Data Anal Ctr Geomagnetism & Space Magnetism, Sakyo Ku, Kyoto 6068502, Japan

[10] Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Kyoto 6110011, Japan

[11] Kyushu Univ, Int Ctr Space Weather Sci & Educ, Fukuoka, Fukuoka 8190395, Japan

[12] Japan Atom Energy Agcy, Tokai, Ibaraki 3191184, Japan

来源：

JOURNAL OF SPACE WEATHER AND SPACE CLIMATE | 2022年 / 12卷

关键词：

Mesospheric ionization; energetic electron precipitation; substorm; growth phase; ENERGETIC ELECTRON-PRECIPITATION; OUTER RADIATION BELT; PULSATING AURORA; MIDDLE; IONOSPHERE; PARTICLE; EVENTS; IMPACT; EISCAT;

D O I：

10.1051/swsc/2022012

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Many studies have been conducted about the impact of energetic charged particles on the atmosphere during geomagnetically active times, while quiet time effects are poorly understood. We identified two energetic electron precipitation (EEP) events during the growth phase of moderate substorms and estimated the mesospheric ionization rate for an EEP event for which the most comprehensive dataset from ground-based and space-born instruments was available. The mesospheric ionization signature reached below 70 km altitude and continued for similar to 15 min until the substorm onset, as observed by the PANSY radar and imaging riometer at Syowa Station in the Antarctic region. We also used energetic electron flux observed by the Arase and POES 15 satellites as the input for the air-shower simulation code PHITS to quantitatively estimate the mesospheric ionization rate. The calculated ionization level due to the precipitating electrons is consistent with the observed value of cosmic noise absorption. The possible spatial extent of EEP is estimated to be similar to 8 h MLT in longitude and similar to 1.5 degrees in latitude from a global magnetohydrodynamic simulation REPPU and the precipitating electron observations by the POES satellite, respectively. Such a significant duration and spatial extent of EEP events suggest a non-negligible contribution of the growth phase EEP to the mesospheric ionization. Combining the cutting-edge observations and simulations, we shed new light on the space weather impact of the EEP events during geomagnetically quiet times, which is important to understand the possible link between the space environment and climate.

引用

页数：16

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