Cooperatives Roles of Dynamics and Topology in Generating the Magnetosphere-Ionosphere Disturbances: Case of the Theta Aurora

T. Tanaka, T. Obara, Masakazu Watanabe, S. Fujita, Y. Ebihara, R. Kataoka, M. Den

研究成果: ジャーナルへの寄稿記事

2 引用 (Scopus)

抄録

To understand the magnetosphere-ionosphere (M-I) disturbances, it is necessary to know the change in the null-separator structure along with the development of convection. The present paper explains this proposition by taking the case of the theta aurora that occurs after the switch of interplanetary magnetic field By and reveals auroral development inside the polar cap. The interplanetary magnetic field change is followed by the reformation of the null-separator structure to cause a convection transient and a successive deformation of separatrices inside the magnetosphere, where separatrices separate the space into different volumes that include different types of magnetic field lines, and intersections of separatrices form separators that connect nulls. By the reconnection on the separator, energy inflow occurs from the solar wind to the magnetosphere. Convection driven by this energy transports nulls. In the case of theta aurora, two new nulls on the dayside coexist with two old nulls carried toward the tail by convection. Each set of nulls generates two open-closed boundaries (separatrices) bounded by separators. Thus, open-closed boundaries are divide into four parts. Separatrices generated by different sets partially become side by side near the nightside stem limes. The theta aurora is generated at the area corresponding to the low-latitude side with respect to both of two boundaries. Thus, the occurrence of the theta aurora is a natural consequence of a transition in the null-separator structure. The present example indicates that the global structure of the magnetosphere is almost decided from the skeleton of nulls.

元の言語英語
ページ(範囲)9991-10,008
ジャーナルJournal of Geophysical Research: Space Physics
123
発行部数12
DOI
出版物ステータス出版済み - 12 1 2018

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Magnetosphere
separators
Ionosphere
aurora
Separators
magnetospheres
topology
cooperatives
ionospheres
magnetosphere
ionosphere
disturbances
Topology
disturbance
convection
magnetic fields
interplanetary magnetic fields
Magnetic fields
magnetic field
Solar wind

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

これを引用

Cooperatives Roles of Dynamics and Topology in Generating the Magnetosphere-Ionosphere Disturbances : Case of the Theta Aurora. / Tanaka, T.; Obara, T.; Watanabe, Masakazu; Fujita, S.; Ebihara, Y.; Kataoka, R.; Den, M.

:: Journal of Geophysical Research: Space Physics, 巻 123, 番号 12, 01.12.2018, p. 9991-10,008.

研究成果: ジャーナルへの寄稿記事

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