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The observations of high energy particles by DSP satellites during storm times

The observations of high energy particles by DSP satellites during storm times Jinbin CAO ， et al., National Key Laboratory of Space Weather Chinese Academy of Sciences. 1 Overview.

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The observations of high energy particles by DSP satellites during storm times

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  1. The observations of high energy particles by DSP satellites during storm times Jinbin CAO，et al., National Key Laboratory of Space Weather Chinese Academy of Sciences

  2. 1 Overview • The Double Star Program (DSP)consists of two satellites, one at an eccentric equatorial orbit with an apogee of about 13.4 RE and the other at a polar orbit with an apogee of about 6.0 RE. • Scientific objectives: • to investigate physical processes of magnetospheric space storms, • to establish physical models of magnetospheric space storms, • To develop dynamic models and prediction techniques of the near-Earth space environment.

  3. 1 Overview The DSP mission is also designed to make coordinated observations with Cluster constellation by synchronizing the local time sector sampled by these two missions.

  4. 1 Overview Eight scientific instruments onboard the equatorial satellite DSP-1. Active Spacecraft Potential Control (ASPOC), FluxGate Magnetometer (FGM), Hot Ion Analyzer (HIA) Heavy Ion Detector (HID) High Energy Electron Detector (HEED) High Energy Proton Detector (HEPD) Spatio-Temporal Analysis of Field Fluctuations (STAFF) and Digital Wave Processor (DWP)) Plasma Electron and Current Experiment (PEACE).

  5. 1 Overview Eight scientific instruments onboard the polar satellite DSP-2. Neutral Atom Imager (NUADU) FluxGate Magnetometer (FGM), Low Energy Ion Detector Heavy Ion Detector (HID) High Energy Electron Detector (HEED) High Energy Proton Detector (HEPD) LFEW (Low Frequency Electromagnetic Wave Detector) Plasma Electron and Current Experiment (PEACE).

  6. 1 Overview Three Chinese instruments onboard TC-1: HEED: High Energy Electron Detector HEPD: High Energy Proton Detector HID:Heavy Ion Detector

  7. 1 Overview Low Energy Ion Detector LFEW (Low Frequency Electromagnetic Wave Detector)

  8. 1 Overview TC-1 was launched on Dec. 30, 2003. HEED, HEPD and HID Commissioning: Start: 12:30 on January 3, 2004 End: 17:30 on January 3, 2004 re-powered on on January 5, 2004 and work continuously

  9. 1 Overview TC-2 was launched on July 25, 2004. HEED, HEPD and HID Commissioning: Start: July 28, 2004

  10. Important observation results： 1).The rapid decrease of relativistic electrons in the inner magnetosphere the generation and loss of relativistic electrons in the inner magnetosphere have been a key unsolved problem in magnetospheric physics. On Nov. 08 2004, 2004, LFEW and HEED of TC-2 made a joint observations of relativistic electrons and whistler waves, and observed for the first time, a long duration loss even of relativistic electrons in the magnetosphere

  11. Important observation results： A large storm on Nov. 8

  12. Important observation results： Some substorms ensued on Nov. 8

  13. Important observation results： CASE1: Energetic electron loss and wave burst observed by TC-2

  14. Important observation results： CASE2: Energetic electron loss and wave burst observed by TC-2

  15. Important observation results： CASE3: Energetic electron loss and wave burst observed by TC-2

  16. Important observation results： Pitch angle distribution before loss event observed by TC-2

  17. Important observation results： Pitch angle distribution before loss event observed by TC-2

  18. Important observation results： Case of Aug. 24, 2005

  19. Important observation results： Case of Aug. 24, 2005

  20. Important observation results： Case of Aug. 24, 2005

  21. Important observation results： Case of Aug. 24, 2005

  22. Important observation results： 2） High energy proton ions during storm time

  23. Important observation results： 2） High energy proton ions during storm time

  24. Important observation results： 3） High energy heavy ions during storm time The high energy heavy ions are major source of SEU. The research of high energy heavy ions in the magnetosphere is of great application significance. The observations of HID/TC2 show that the high energy heavy ion can fill the whole magnetosphere during storm time.

  25. Conclusions： 1) During geomagnetic storms, wave-particle interaction is very strong. Sometimes waves make energetic electrons precipitate into atmosphere and cause the loss of energetic electrons.Sometimes the precipitating electrons produce waves. 2) Even during a storm,some satellites observed the decrease of high energy electrons and some other satellites observe the increase of high energy electrons. Non global! 3) High energy proton flux decreases during some geomagnetic storms, and increase during some other geomagnetic storms. 4) During geomagnetic storm, the high energy He ions exist in the whole radiation belt

  26. Thank you END

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