| タイトル | Fine structure of low-energy H(+) in the nightside auroral region |
| 著者（英） | Chappell, C. R.; Liu, Chao; Perez, J. D.; Moore, T. E.; Slavin, J. A. |
| 著者所属（英） | NASA Goddard Space Flight Center|NASA Marshall Space Flight Center |
| 発行日 | 1994-03-01 |
| 言語 | eng |
| 内容記述 | Low-energy H(+) data with 6-s resolution from the retarding ion mass spectrometer instrument on Dynamics Explorer (DE) 1 have been analyzed to reveal the fine structure at middle altitudes of the nightside auroral region. A new method for deconvolving the energy-integrated count rate in the spin plane of the satellite has been used to derive the two-dimensional phase space density. A detailed analysis reveals an alternating conic-beam-conic pattern with the observed conics correlated with large earthward currents in the auroral region. The strong downward current (larger than 1 microamperes per sq m (equivalent value at ionosphere)) provides a free energy source for the perpendicular ion heating, that generates the ion conics with energies from several eV to tens of eV. The bowl shape distribution of the low-energy H(+) is caused by the extended perpendicular heating. The strong correlation between conics and large downward currents suggests that the current-driven electrostatic ion cyclotron wave is an appropriate candidate for the transverse heating mechanism. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 95A68676 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/309696 |
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