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Title: Oxygen torus and its coincidence with EMIC wave in the deep inner magnetosphere: Van Allen Probe B and Arase observations

Abstract

We investigate the longitudinal structure of the oxygen torus in the inner magnetosphere for a specific event found on 12 September 2017, using simultaneous observations from the Van Allen Probe B and Arase satellites. It is found that Probe B observed a clear enhancement in the average plasma mass (M) up to 3–4 amu at L = 3.3–3.6 and magnetic local time (MLT) = 9.0 h. In the afternoon sector at MLT ~ 16.0 h, both Probe B and Arase found no clear enhancements in M. This result suggests that the oxygen torus does not extend over all MLT but is skewed toward the dawn. Since a similar result has been reported for another event of the oxygen torus in a previous study, a crescent-shaped torus or a pinched torus centered around dawn may be a general feature of the O+ density enhancement in the inner magnetosphere. We newly find that an electromagnetic ion cyclotron (EMIC) wave in the H+ band appeared coincidently with the oxygen torus. From the lower cutoff frequency of the EMIC wave, the ion composition of the oxygen torus is estimated to be 80.6% H+, 3.4% He+, and 16.0% O+. According to the linearized dispersion relationmore » for EMIC waves, both He+ and O+ ions inhibit EMIC wave growth and the stabilizing effect is stronger for He+ than O+. Therefore, when the H+ fraction or M is constant, the denser O+ ions are naturally accompanied by the more tenuous He+ ions, resulting in a weaker stabilizing effect (i.e., larger growth rate). From the Probe B observations, we find that the growth rate becomes larger in the oxygen torus than in the adjacent regions in the plasma trough and the plasmasphere.« less

Authors:
ORCiD logo [1];  [2];  [3];  [4];  [5];  [2];  [6];  [7];  [8];  [9];  [1];  [1];  [2];  [10];  [11];  [1];  [3];  [12];  [1];  [13] more »;  [13];  [14];  [15];  [14]; ORCiD logo [16] « less
+ Show Author Affiliations
  1. Nagoya Univ. (Japan)
  2. Kyoto Univ. (Japan)
  3. Tohoku Univ., Sendai (Japan)
  4. Kanazawa Univ. (Japan)
  5. Kyushu Institute of Technology (Japan)
  6. Southwest Research Institute, San Antonio, TX (United States); Univ. of Texas at San Antonio, TX (United States)
  7. Nagoya Univ. (Japan); Univ. of New Hampshire, Durham, NH (United States)
  8. Indian Institute of Geomagnetism, Navi Mumbai (India)
  9. North-Eastern Federal University, Yakutsk (Russia)
  10. Univ. of Tokyo (Japan)
  11. Osaka Electro-Communication University, Neyagawa (Japan)
  12. Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan)
  13. Univ. of Iowa, Iowa City, IA (United States)
  14. Univ. of New Hampshire, Durham, NH (United States)
  15. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  16. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
Japan Society for the Promotion of Science (JSPS); National Aeronautics and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1804382
Report Number(s):
LA-UR-21-23196
Journal ID: ISSN 1880-5981; TRN: US2212283
Grant/Contract Number:  
89233218CNA000001; 16H04057; 17K18804; 17K0566; 16H06286; 15H05815; 15H05747; 20H01959; 921647; NAS5-01072
Resource Type:
Accepted Manuscript
Journal Name:
Earth, Planets and Space (Online)
Additional Journal Information:
Journal Name: Earth, Planets and Space (Online); Journal Volume: 72; Journal Issue: 1; Journal ID: ISSN 1880-5981
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Heliospheric and magnetospheric physics; Oxygen torus; EMIC wave; ULF wave; Ion composition; Inner magnetosphere

Citation Formats

Nosé, M., Matsuoka, A., Kumamoto, A., Kasahara, Y., Teramoto, M., Kurita, Satoshi, Goldstein, J., Kistler, L. M., Sing, S., Gololobov, A., Shiokawa, K., Iamojo, S., Oimatsu, S., Yamamoto, K., Obana, Y., Shoji, M., Tsuchiya, F., Shinohara, I., Miyoshi, Yoshizumi, Kurth, W. S., Kletzing, C. A., Smith, C. W., MacDowall, R. J., Spence, H. E., and Reeves, Edmond Geoffrey David. Oxygen torus and its coincidence with EMIC wave in the deep inner magnetosphere: Van Allen Probe B and Arase observations. United States: N. p., 2020. Web. doi:10.1186/s40623-020-01235-w.
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Nosé, M., Matsuoka, A., Kumamoto, A., Kasahara, Y., Teramoto, M., Kurita, Satoshi, Goldstein, J., Kistler, L. M., Sing, S., Gololobov, A., Shiokawa, K., Iamojo, S., Oimatsu, S., Yamamoto, K., Obana, Y., Shoji, M., Tsuchiya, F., Shinohara, I., Miyoshi, Yoshizumi, Kurth, W. S., Kletzing, C. A., Smith, C. W., MacDowall, R. J., Spence, H. E., & Reeves, Edmond Geoffrey David. Oxygen torus and its coincidence with EMIC wave in the deep inner magnetosphere: Van Allen Probe B and Arase observations. United States. https://doi.org/10.1186/s40623-020-01235-w
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Nosé, M., Matsuoka, A., Kumamoto, A., Kasahara, Y., Teramoto, M., Kurita, Satoshi, Goldstein, J., Kistler, L. M., Sing, S., Gololobov, A., Shiokawa, K., Iamojo, S., Oimatsu, S., Yamamoto, K., Obana, Y., Shoji, M., Tsuchiya, F., Shinohara, I., Miyoshi, Yoshizumi, Kurth, W. S., Kletzing, C. A., Smith, C. W., MacDowall, R. J., Spence, H. E., and Reeves, Edmond Geoffrey David. Mon . "Oxygen torus and its coincidence with EMIC wave in the deep inner magnetosphere: Van Allen Probe B and Arase observations". United States. https://doi.org/10.1186/s40623-020-01235-w. https://www.osti.gov/servlets/purl/1804382.
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@article{osti_1804382,
title = {Oxygen torus and its coincidence with EMIC wave in the deep inner magnetosphere: Van Allen Probe B and Arase observations},
author = {Nosé, M. and Matsuoka, A. and Kumamoto, A. and Kasahara, Y. and Teramoto, M. and Kurita, Satoshi and Goldstein, J. and Kistler, L. M. and Sing, S. and Gololobov, A. and Shiokawa, K. and Iamojo, S. and Oimatsu, S. and Yamamoto, K. and Obana, Y. and Shoji, M. and Tsuchiya, F. and Shinohara, I. and Miyoshi, Yoshizumi and Kurth, W. S. and Kletzing, C. A. and Smith, C. W. and MacDowall, R. J. and Spence, H. E. and Reeves, Edmond Geoffrey David},
abstractNote = {We investigate the longitudinal structure of the oxygen torus in the inner magnetosphere for a specific event found on 12 September 2017, using simultaneous observations from the Van Allen Probe B and Arase satellites. It is found that Probe B observed a clear enhancement in the average plasma mass (M) up to 3–4 amu at L = 3.3–3.6 and magnetic local time (MLT) = 9.0 h. In the afternoon sector at MLT ~ 16.0 h, both Probe B and Arase found no clear enhancements in M. This result suggests that the oxygen torus does not extend over all MLT but is skewed toward the dawn. Since a similar result has been reported for another event of the oxygen torus in a previous study, a crescent-shaped torus or a pinched torus centered around dawn may be a general feature of the O+ density enhancement in the inner magnetosphere. We newly find that an electromagnetic ion cyclotron (EMIC) wave in the H+ band appeared coincidently with the oxygen torus. From the lower cutoff frequency of the EMIC wave, the ion composition of the oxygen torus is estimated to be 80.6% H+, 3.4% He+, and 16.0% O+. According to the linearized dispersion relation for EMIC waves, both He+ and O+ ions inhibit EMIC wave growth and the stabilizing effect is stronger for He+ than O+. Therefore, when the H+ fraction or M is constant, the denser O+ ions are naturally accompanied by the more tenuous He+ ions, resulting in a weaker stabilizing effect (i.e., larger growth rate). From the Probe B observations, we find that the growth rate becomes larger in the oxygen torus than in the adjacent regions in the plasma trough and the plasmasphere.},
doi = {10.1186/s40623-020-01235-w},
journal = {Earth, Planets and Space (Online)},
number = 1,
volume = 72,
place = {United States},
year = {Mon Aug 03 00:00:00 EDT 2020},
month = {Mon Aug 03 00:00:00 EDT 2020}
}
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