Effects of Interplanetary Shock Inclinations on Nightside Auroral Power Intensity

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• 作者：D. M. Oliveira ; J. Raeder ; B. T. Tsurutani ; J. W. Gjerloev
• 关键词：Space physics ; Ionosphere ; magnetosphere interaction ; Plasma physics
• 刊名：Brazilian Journal of Physics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：46
• 期：1
• 页码：97-104
• 全文大小：557 KB
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• 作者单位：D. M. Oliveira (1) (2)
  J. Raeder (3)
  B. T. Tsurutani (4)
  J. W. Gjerloev (5) (6)
  
  1. NASA Goddard Space Flight Center, Greenbelt, MD, USA
  2. Goddard Planetary Heliophysics Institute, University of Maryland Baltimore County, Baltimore, MD, USA
  3. EOS Space Science Center and Department of Physics, University of New Hampshire, Durham, NH, USA
  4. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
  5. Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
  6. Birkeland Centre of Excellence, University of Bergen, Bergen, Norway
  
• 刊物类别：Physics and Astronomy
• 出版者：Springer New York
• ISSN：1678-4448

文摘

We derive fast forward interplanetary (IP) shock speeds and impact angles to study the geoeffectiveness of 461 IP shocks that occurred from January 1995 to December 2013 using ACE and Wind spacecraft data. The geomagnetic activity is inferred from the SuperMAG project data. SuperMAG is a large chain which employs more than 300 ground stations to compute enhanced versions of the traditional geomagnetic indices. The SuperMAG auroral electroject SME index, an enhanced version of the traditional AE index, is used as an auroral power (AP) indicator. AP intensity jumps triggered by shock impacts are correlated with both shock speed and impact angle. It is found that high AP intensity events typically occur when high speed IP shocks impact the Earth’s magnetosphere with the shock normal almost parallel to the Sun-Earth line. This result suggests that symmetric and strong magnetospheric compression leads to favorable conditions for intense auroral power release, as shown previously by simulations and observations. Some potential mechanisms will be discussed. Keywords Space physics Ionosphere-magnetosphere interaction Plasma physics