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Low Energy Neutral Atom Signatures of

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Sun pulse brightens considerably at time of solar wind density enhancement. ... Signatures associated with reconnection are observed at IMAGE and by the Tiger ... – PowerPoint PPT presentation

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Title: Low Energy Neutral Atom Signatures of


1
Low Energy Neutral Atom Signatures of
Magnetopause Motion in Response to Southward Bz
Michael R. Collier, Thomas E. Moore, Hina Khan,
and Steve Snowden

2
XMM X-ray Observations of Solar Wind Charge
Exchange
Sun pulse brightens considerably at time of
solar wind density enhancement. Plan to break
interval up in time and compare NSW observations
with X-ray fluxes.
3
Magnetosheath Neutral Atom Emissions
But, sun pulse brightening and sheath emission
only require a magnetopause that is closer to the
Earth - not necessarily higher solar wind ram
pressure. One way to move the magnetopause
closer to the Earth is to erode it with southward
Bz.
4
The April 18, 2001 Event
On April 18, 2001, LENA observed sheath
emissions and sun pulse modulation. But between
0100 and 0430, the solar wind ram pressure was
steady.
5
Correlation Between LENA Data and Bz
Time-shifted cross-correlation does show a peak
consistent with the solar wind convection
time. Peak correlation not that high
(1) The relationship between Bz and emission is
highly non-linear. (2) Multi-spacecraft studies
show that the IMF does not correlate well even
with itself. (3) The LENA observations are line
of sight and the B-field observations are at a
single point.
6
  • Sun Pulse/Sheath Brightenings and Radar Data
  • Strong correlation between LENA data and
    backscattered radar power from Tiger

7
LENA Movie of Sun Pulse Modulation with IMF Bz
Sun pulse brightens in association with more
southward turnings of the IMF while dimming
in response to northward turnings.
8
Conclusions
  • Have simultaneous observations of solar wind
    charge exchange in X-rays and low energy neutral
    atoms (June 1-2, 2001, day 152-153).
  • During the April 18, 2001 (day 108) event,
    neutral solar wind fluxes are modulated by the
    interplanetary magnetic field and interpreted as
    due to magnetopause erosion.
  • Signatures associated with reconnection are
    observed at IMAGE and by the Tiger radar at about
    the same time (within a few minutes), which
    supports this association.
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