Energetic Particles and the Magnetospheric Cusps

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Energetic Particles and the Magnetospheric Cusps
Huntsville Workshop October 31, 2000
Callaway Gardens Pine Mountain, Georgia

• Theodore A. Fritz

Significant Contributors Jiasheng Chen, Mohamed
Alothman, Eric Foreman, Maria Karra Boston
University, Volt Lutsenko IKI, Russia,
Richard Belian, Reiner Freidel, Geoff Reeves Los
Alamos
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Modified from Roederer, 1967
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Energetic Particles Observed by Polar in the
Pseudo-trapping Region
Fritz, 2000
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Scanned slide 19960917 IPS Energy Spectra
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Scanned slide 19980426 IPS Energy Spectra
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Local Time distribution of Polar Time-Energy
Dispersion Events
Karra and Fritz, 1999
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Fritz, et al., 1999
Cusp Energetic Particle Event
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Shabansky orbit
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Lyons and Williams, 1984
Polar Located 3 Re above the equatorial plane
LANL 97A
x
LANL 1994-084
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X
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Scanned slideSOPA LANL-97A
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Scanned slideSOPA 1994-084
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Scanned slide Polar observes major injection at
0514 UT
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At 051536 UT, Interball observes major flux
increase
Earthward looking sensor
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Comparison of first two spectra following onset
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A new paradigm?

• On June 28, 1999,there were no energetic
  particles upstream in the interplanetary medium
  prior to 0510 UT when a large density pulse in
  the solar wind impacted the magnetopause.
• Immediately following the compression of the
  magnetopause inside the geostationary orbit near
  the subsolar point, energetic particles were
  observed to be precipatating into the
  low-altitude polar cusp.
• Polar observed ion fluxes with ring current
  energies coincident with a Dst depression when
  Polar was located at 7 MLT and greater than
  three Earth radii above the equatorial plane.
  Their composition was recent solar wind.
• The Interball DOK2 experiment 21 Re upstream
  observed particles arriving from the direction of
  the Earth 6 minutes after the magnetopause
  compression. The particles were seen even later
  at Wind and Geotail.
• Conclusion The present paradigm is not
  consistent with either the rapid energization of
  solar wind plasma to ring current energies or the
  location of the ring current ions observed.