Home | Contact | Sitemap | 中文 | CAS
Search:
About Us Research People International Cooperation News Education & Training Join Us Journals Papers Resources Links
Location: Home > News > Seminars
News
  • Events
  • DAMPE
  • Seminars
  • Research Trends
  • Generation of Kinetic Alfven Waves in the Magnetospheric Boundary Layers

     

    Seminar Title:

    Generation of Kinetic Alfven Waves in the Magnetospheric Boundary Layers

    Speaker:

    Prof. YU Lin

    Affiliation: 

    (Physics Department, Auburn University, Auburn, AL 36849)

       

    When:

    Tuesday morning, Nov.8th , 10:00 a.m

    Where:

    Room 419, Office Block, 2 West Beijing Road (PMO, CAS)
     
     

    Welcome to Attend

     
      ( PMO Academic Committee & Academic Circulating committee)
     
     

     

    Abstract    
    Kinetic Alfven Waves (KAW) are believed to play an important role in the particle transport, heating, and acceleration at the magnetopause and in the substorm processes of the magnetosphere. In this talk, our global and local 3-D hybrid simulations will be presented for the generation of KAWs in the dayside and nightside magnetosphere under various interplanetary magnetic field (IMF) conditions. (1) In the cases in which the direction of IMF is such that the bow shock is a quasi-parallel shock, the interaction of kinetically excited foreshock waves/pressure pulses with the dayside magnetosphere leads to strong surface perturbations at the magnetopause. The compressional waves are found to mode convert to shear Alfven waves and KAWs through the Alfven resonance process at the magnetopause, which in turn produces field line resonance and field-aligned currents in the magnetosphere. (2) Under a southward IMF, Alfven waves as well as field-aligned ion beams are generated by magnetic reconnection in the tail plasma sheet. In the near-Earth region, large-amplitude short-wavelength KAWs are present, which propagate along field lines into the ionosphere. The simulation shows that these KAWs are generated through a phase mixing process in the plasma boundary.

    Copyright? Purple Mountain Observatory, CAS, No.10 Yuanhua Road, Qixia District, Nanjing 210023, China
    Phone: 0086 25 8333 2000 Fax: 8333 2091 http://english.pmo.cas.cn