IONOSPHERIC STORMS

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IONOSPHERIC STORMS

• P. Cson Brandt
• (Acknowledgements to J. C. Foster, MIT, and H.
  Kil, JHU/APL)

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BASTILLE DAY RESPONSE
RECOVERY PHASE
MAIN PHASE
INITIAL PHASE
Courtesy of Dr. Hyosub Kil, JHU/APL
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IONOSPHERIC STORM TERMINOLOGY

• Negative phase storm Joule heating in the
  auroral region ? upward expansion of neutral
  atmosphere ? Loss of ionospheric O.
• Positive phase storm (1) Equatorward neutral
  winds drag plasma along field lines, or, (2)
  Polar neutral atmosphere lands at the equator ?
  decreases N2 ? reduces recombination ? increases
  electron density.
• Seasonal effect polar cap sunlit ? higher
  conductivity ? stronger joule heating.

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MAIN PHASE
INITIAL PHASE
MAIN PHASE
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RECOVERY PHASE
RECOVERY PHASE
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RECOVERY PHASE
RECOVERY PHASE
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RECOVERY PHASE
RECOVERY PHASE