教師資料查詢 | 類別: 會議論文 | 教師: 汪愷悌WANG KAITI (瀏覽個人網頁)

標題:Fermi acceleration of electrons driven by electric fields coupled to curvature drifts during dipolarization
學年110
學期2
發表日期2022/06/07
作品名稱Fermi acceleration of electrons driven by electric fields coupled to curvature drifts during dipolarization
作品名稱(其他語言)
著者Kaiti Wang
作品所屬單位
出版者
會議名稱2022臺灣地球科學聯合學術研討會
會議地點台北市,台灣
摘要The pitch angle distributions (PADs) of electrons have shown variations due to the changes in field configurations during dipolarization via satellite observations at Earth’s tailside. A specific variation of energy-dependent pattern for the associated field-aligned anisotropies η was also often found from tens of eV to hundreds of eV or from hundreds of eV to thousands of eV during dipolarization by measurements of the instrument ESA (ElectroStatic Analyzer) for < 30keV electrons onboard of THEMIS Mission. In the beginning of dipolarization, a distinct peak of η occurred at a lower energy level; during dipolarization, a peak with smaller value occurred at a higher energy level. Two representative events at 10 Earth radii will be presented. One event showed an increase in differential energy fluxes above ~ 2keV while the other event showed a decrease in these fluxes above a similar energy level. Fermi acceleration of electrons driven by electric fields coupled to curvature drifts is examined by adopting the values of observed electric fields and magnetic fields. Interestingly, deceleration of electrons is found possible to occur through inputting the real observed values of electric/magnetic fields, though this mechanism was used to theoretically explain electrons accelerated to high energies at the presence of a dawn-to-dusk electric field. Therefore, this Fermi acceleration/deceleration is found to yield larger η at higher energy levels closer to observed range as well as produce the observed increase/decrease in changes of differential energy flux above ~ 2keV. This can be considered as the scientific benefit from observations besides theoretical works.
關鍵字Fermi acceleration;electric fields;curvature drifts;dipolarization;electrons
語言英文
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會議性質國內
校內研討會地點
研討會時間20220607~20220610
通訊作者Kaiti Wang
國別中華民國
公開徵稿
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