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Effects of Storm-Enhanced Density on Ionospheric Dynamics During March 1990 Events

This study investigates the impact of Storm-Enhanced Density (SED) phenomena on the mid-latitude ionosphere, particularly during the events of March 18-19, 1990. Utilizing data from the MIT Haystack Observatory and Millstone Hill radar observations, we analyze the role of penetrating electric fields in energizing particles, modifying the plasmasphere, and affecting the equatorial ionosphere. Key findings include the formation of detached plasmas and enhancements in Total Electron Content (TEC) due to the overlap of penetration jets with the outer plasmasphere, leading to significant ionospheric disturbances.

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Effects of Storm-Enhanced Density on Ionospheric Dynamics During March 1990 Events

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  1. Plasma Tails & Ionospheric SED J C FosterMIT Haystack ObservatoryYosemite 2002

  2. Millstone Hill UHF Radar Elevation ScansMid-LatitudeStorm Enhanced Density

  3. Electron Density @ 500 km Altitude Geodetic Latitude Universal Time 18-19 March 1990 Foster, JGR, 1993 (Foster, JGR, 1993)

  4. March 1990Su et al., GRL 2001 March 31, 2001IMAGE EUV

  5. Storm Enhanced DensityFoster, JGR, 1993 Kp=8 Kp=6 Kp=4

  6. A Strong Polarization Electric Field forms in Low-Conductivity Region between the Inner Edge of the Plasmasheet Precipitation and the Plasmapause Plasmapause Penetration Jet Trough Penetration Jet DMSP F15 6 April 2000 21 MLT Plasmapause Plasmasheet

  7. Effects of Penetrating Electric Fields • Cross-tail electric fields energize and inject particles into the inner magnetosphere forming the disturbance Ring Current • Penetrating electric fields uplift and perturb the Plasmasphere and low-latitude ionosphere • Storm-Enhanced Density (SED) and detached plasmas are formed as the Penetration Jet overlaps the outer plasmasphere • Injected Energetic Ions are Destabilized in Regions of Enhanced Plasma Density

  8. Radial E Field Eastward Penetration Electric Field Uplifts Equatorial Ionosphere Penetration JetStrips Away Outer Plasmasphere Dual Effects of Penetrating Electric Fields Detached Plasmaspheric Regions Penetration Electric FieldUplifts Equatorial Ionosphere Polarization JetStrips Away Outer Plasmasphere

  9. SED formed where PJ overlaps enhanced outer Plasmasphere

  10. Variable TEC Eglin AFB, Fla L=2

  11. GPS Map of TEC July 15, 2000 22:15 UT Plumes & Blobs of Storm-Enhanced DensitySweep across Mid Latitudes Penetration Jet Enhancement and Poleward Expansion ofEquatorial Anomaly

  12. GPS Map of SED Plume Mar 31, 2001

  13. PJ Overlaps Outer Plasmasphere March 31, 2001DMSP F13

  14. MISA DMSP F13 Zenith GPS and Millstone Hill Radar Maps ofStorm Enhanced Density 75 TECu 1015 el m-2s-1

  15. IMAGE Plasmapause(J. Goldstein)

  16. SED Plume: GPS and IMAGE

  17. Mid-Latitude Scintillation Hanscom AFB, MA Scintillation Occurs as SED Sweeps across Mid Latitudes Millstone Hill ISR Noontime Scintillation TECu/min GPS ROTI Westford MA

  18. Radar: Storm Enhanced DensityIMAGE: Plasmaspheric Tail Detached plasma SED

  19. Tongues of Ionization Plasmasphere Drainage Plumes Storm Enhanced Density Polar Ionosphere View Polar Magnetosphere View

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