LANL MPA Observations of the May 1998 Storm Event
May 1, 1998
- No plasmasphere.
- Normal convection as indication of the location of electron plasma sheet
entry.
- Shock observed at 22UT (post-dusk) by 1990-095 (Shock observed at 2120UT
by WIND with northward IMF).
- Plasmasphere refilling (1990-095) at 2050-2300UT (enhancement at 22UT)
- PC pulsations sloshing cold plasma at 22-23UT on 1990-095.
- Plasma sheet entry (1990-095) from southward IMF at ~2250 UT.
- Growth phase dropped out on 1990-095 at ~2300-2415 UT (pre-midnight).
May 2, 1998
- Plasmaspheric draining plumes across the dayside. Plasmaspheric plumes at
around noon (0450 UT) on 1994-084; fast reaction on southward IMF turning
at 0335UT by WIND.
- Magnetosheath/low-latitude boundary layer encounter at ~1245 and 1330UT
on 1991-080. The draining plume is adjacent to the magnetosheath ions. The
plasmaspheric ions flow westward.
- Strong convection; electron plasma sheet entry before dusk.
- Oscillated plasmaspheric ions flow west-east alternately at ~5-6UT
(pre-noon) on 1994-084.
- Plasma sheet enhancement at ~15UT (post-dusk). Ion plasma sheet
temperature is ~10keV.
- Spacecraft charging to 100's volts (ion lines were seen) at ~16UT to the
end of the day on 1994-084 and LANL-97a.
- High plasma sheet densities (n ~ 3 cm-3) at the end of the day on
LANL-97a and 1994-084.
May 3, 1998
- Strong convection; electron plasma sheet entry before dusk.
- Plasma sheet densities are high at the beginning of the day.
- Magnetosheath/low-latitude boundary layer across on the dayside at 4-8UT
with southward IMF.
- Plasmaspheric ions are adjacent to the magnetosheath ions. Plasmasphere
is drain out.
- Convection surge rush at electron plasma sheet at ~12UT on 1994-084 and
LANL-97a (nearby), which may be associated with the substorm injection.
- Enhancement of the plasma sheet at ~18UT was associated with the substorm
injection. Shock at 17UT by WIND.
- Big substorm at ~21UT, which shown on SOPA high-energy electron data;
penetrating radiation after ~21UT.
- Spacecraft charging to 100's volts (ion lines were seen) at ~1830UT on
both 1994-084 and LANL-97a.
May 4, 1998
- Penetrating radiation during 0-3UT.
- Spacecraft charging to 100's volts at 0-4UT on 1994-084.
- Magnetosheath across on the dayside at ~3-8UT. Shock turning at 0225UT by
WIND with southward IMF (solar wind density and velocity were enhanced).
- Three enhancements of magnetosheath ions (adjacent to the plasmaspheric
ions) at ~0540, 0655, and 0720 UT on 1991-080, 1994-084, and LANL-97a are
associated with the enhanced solar wind densities at ~0500, 0630, and 0700
UT by WIND.
- Two species of low-energy ions (mainly westward) appear at ~1340-1630 LT
on 1994-084.
- Strong convection; electron plasma sheet entry before dusk at ~12UT.
- Rush at electron plasma sheet at ~12UT on both 1994-084 and LANL-97a
(nearby), which was associated with the substorm injection.
- Enhancement of the electron plasma sheet at ~16UT was associated with the
substorm injection.
May 5, 1998
- Plasmaspheric draining plumes across the dayside at ~11-15LT seen on
1994-084 and LANL-97A. The plumes were structured in density (lumpy). The
location of the plasmaspheric plumes began to retrieve to dusk.
- Electron plasma sheet entry at ~18LT indicated strong convection (Kp ~
-6). The few hour gap (electron trough) between draining plumes and
electron plasma sheet entry.
- Enhancement of the plasma sheet at ~17UT is associated with substorm
injection.
- Moderate level of penetrating radiation after ~17UT.
- Spacecraft charging to 100's volts at midnight region after ~17UT.
May 6, 1998
- No plasmasphere.
- Normal convection as indication of the location of electron plasma sheet
entry.
- Moderate penetrating radiation throughout all day.
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