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| 題 名 | Storm-associated Variations of [OI] 630.0nm Emissions from Low Latitudes=磁暴時低緯度地區[OI]630.0nm發射量變化 |
|---|---|
| 作 者 | Mukherjee,G. K.; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
| 卷 期 | 10:1 1999.03[民88.03] |
| 頁 次 | 頁265-276 |
| 分類號 | 338.9 |
| 關鍵詞 | 磁暴; 低緯度地區; 發射量; Ionosphere; Airglow; Precipitation; |
| 語 文 | 英文(English) |
| 英文摘要 | The ground-based magnetic signature of particle precipitation from the ring current to low latitude regions during the recovery phase of a geo- magnetic storm on 23 December, 1995, has been inferred by studying pho- tometric 630.0 nm nightglow at a low latitude station, Kolhapur (7.5 ° N, 144.7A25 ° E; Geomagnetic, dip latitude 10.6 ° N) and magnetograms (H,D and Z) of nearby low latitude stations. The maximum optical emission occurred simultaneously with the maximum positive (north ward) excursions in the H trace of low latitude magnetograms associated with negative H excur- sions at high latitude observatories. Generally, an increase in Z component occurred at all low latitude stations. A large intensity increase of about seven times in 630.0 nm emission was observed at around 2:15 hrs I.S.T on 23 December, 1995. The 630.0 nm enhancement maximised at the time of high Dst or Kp index during the night. In addition, the ionosonde experi- ment conducted at Ahmedabad (13.8 ° N, 144.7 ° E; Geomagnetic) showed the enhancement of peak electron densities in the F-region and sudden lower- ing of the F layer in the ionosphere. A possible explanation of the effect is given in terms of emergence of energetic neutral atoms (Hydrogen or Oxy- gen) from high energy protons in a typical charge exchange process in the ring current depositing energy into the thermosphere-ionosphere system, also possibly due to changes in the composition of the thermosphere-iono- sphere during magnetic storms that would enhance the 630.0 nm emissions. |
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