Knowledge Resource Center for Ecological Environment in Arid Area
| F-region Dusk Ion Temperature Spikes at the Equatorward Edge of the High Latitude Convection Region | |
| [null] | |
| 出版年 | 2013 |
| 英文摘要 | By examining continuous data from the Poker Flat Incoherent Scatter Radar (PFISR) in Poker Flat, Alaska, short-lived enhancements in the F-region ion temperature, or "Tᵢ spikes", were discovered in the evening while the radar was on the equatorward edge of the high latitude convection region. These enhancements were several hundred Kelvin above the background temperature, would last less than 15 minutes and were preceded by sharp depletions in plasma density (of roughly one half). Though they were mostly detected in the summer, 25 events throughout a whole year of data were identi ed in which the spike occurred within 1.5 hours of the density drop. By examining the location of PFISR at the time of the enhancements, as well as the conditions under which these spikes occurred, it was concluded that these enhancements were the result of electric elds increasing the frictional heating between ions and neutrals. By then examining geophysical data, it was found that these events were temporal and related to changes in magnetic indices. One possible explanation for the observations is that the electric eld is at its strongest near the plasmapause during substorms. Another more likely possibility is that during substorms the region of sunward ion convection expands into a region in the evening side where the neutral gas moves in a direction opposite to the ions, thereby enhancing the frictional heating rate. |
| 英文关键词 | F-region Ion Temperature Dusk High Latitude Convection Region Poker Flat Incoherent Scatter Radar PFISR Frictional heating Electric Field |
| 语种 | 英语 |
| URL | http://hdl.handle.net/10388/ETD-2013-12-1333 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/247776 |
| 推荐引用方式 GB/T 7714 | [null]. F-region Dusk Ion Temperature Spikes at the Equatorward Edge of the High Latitude Convection Region[D],2013. |
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