천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제43권1호
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- Pages.51.3-52
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- 2018
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- 1226-2692(pISSN)
The Flow of the Interstellar Plasmas surrounding the Heliopause estimated via IBEX-Lo Observations
- 박지우 ;
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- ;
- Park, Jeewoo (NASA Goddard Space Flight Center) ;
- Kucharek, Harald (University of New Hampshire) ;
- Isenberg, Philip A. (University of New Hampshire) ;
- Paschalidis, Nikolaos (NASA Goddard Space Flight Center)
- 발행 : 2018.05.08
초록
Since Voyager 1 passed the Heliopause in 2012, it has provided the observations of the charged particles in the local interstellar medium. However, Voyager 1 only provides the information along with its trajectory. In order to understand the global view of the interstellar plasma flow surrounding the Heliopause, we need another tool. When the interstellar plasmas approach the Heliopause, the ions are deflected around the Heliopause due to the draping of the interstellar magnetic field. The draping of the interstellar magnetic field is strongly connected with the shape of the Heliopause. A fraction of the diverted ions exchanges their charges with the undisturbed primary interstellar neutral atoms, and then the ions become neutral atoms called the secondary interstellar neutral atoms. The newly created neutral atoms carry information on the diverted flow of the interstellar ions, and a fraction of them can travel to the Sun. Therefore, the secondary component of the interstellar neutrals is an excellent diagnostic tool to provide important information to constrain the shape of the Heliopause. The secondary interstellar neutrals are observed by Interstellar Boundary Explorer (IBEX) at Earth's orbit. Since 2009, two energetic neutral atom cameras on IBEX have measured neutral atoms and it has provided sky maps of neutral atoms. In this presentation, we will discuss the directional distribution of the secondary interstellar neutrals at Earth's orbit. In the sky maps, the primary interstellar neutral gas is seen between
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