臺灣博碩士論文加值系統

本論文所取用之資料,來自於AMPTE/IRM衛星所提供自1984年到1985年共14
個磁鞘穿越之資料.目地是要研究在太陽風驅動地球磁層前,通過地球船頭
震波後一直到接近地球磁層頂這段期間磁鞘的熱力狀態分佈,並予以討論
適用於磁鞘之熱力方程.我們參考舊有的熱力方程加以更廣義的定義一套
新的熱力方程,用來分析磁鞘間各區間的熱力狀態.我們將磁鞘依位置及電
漿波之波動特性概略地分成五個區間,每個區間均分析其熱力狀態,然後再
用以統計的分法分析比較整個磁鞘熱力狀態隨位置不同的變化情形.結果
我們發現隨著太陽風進入地球船頭震波後一直到接近磁層頂,它的熱力狀
態,會在一段時間後才會慢慢的到達等溫狀態,然後再逐漸的接近絕熱狀
態.而電漿之壓力,密度,磁場資料之分佈狀況也由橢圓面型分佈,慢慢的拉
長成線型分佈.對於雙重多向性定律之熱力方程的適用性,我們也將討論.
而分析之所得各項參數資料將有助於以後對磁鞘的研究.

Total 14 magnetosheath crossing events observed by AMPTE/
IRMduring 1984 to 1985 are used to study the thermodynamic
propertiesfor the magnetosheath plasma near the subsolar region.
Empirical polytropic equations wih temperature anisotropy
areobtained from the best-fit of observations.Comparisons with
the CGL and double-polytropic models are alsodiscussed. The
magnetosheath crossings are devided into fiveequal spatoal areas
based on their perturbation characteristics.All regions are
analyzed in order to find their thermodynamicproperties. From
the Earth's bow shock to the magnetopause, it isfound that the
thermodynamic state will gradually evolve from anon-Maxwellian
to an isothermal state and then approach to an adiabatic state
near the magnetopause.