Gemeditor at 23:10, 11 July 2008

2008-07-11T23:10:33Z

Gemeditor at 23:08, 11 July 2008

2008-07-11T23:08:03Z

Gemeditor: New page: == SEPs from the Heliosphere to the Magnetosphere == '''Conveners: Janet Luhmann and Mary Hudson''' A brief but productive discussion of the problem of SEPs (Solar Energetic Particles) f...

2008-07-11T21:51:34Z

New page: == SEPs from the Heliosphere to the Magnetosphere == '''Conveners: Janet Luhmann and Mary Hudson''' A brief but productive discussion of the problem of SEPs (Solar Energetic Particles) f...

New page

== SEPs from the Heliosphere to the Magnetosphere ==

'''Conveners: Janet Luhmann and Mary Hudson'''

A brief but productive discussion of the problem of SEPs (Solar
Energetic Particles) from their production in the heliosphere to
their geospace effects, was held on Thursday, June 26. This is
a particularly rich and appropriate GEM/SHINE topical
area because it involves connecting a chain of processes
occurring in the solar corona and interplanetary medium to responses
in the middle atmosphere, via the magnetosphere.
The large solar proton events that are of most interest
were the main focus of the discussion, which was kicked off
with an overview of the heliospheric end by David Lario (JHUAPL).
David described the still outstanding problems of a lack of
understanding of the details of the particle production, energization
and transport. This was followed by a more specific discussion
by David Ruffolo (Mahidol Univ.) of the most energetic of SEP events,
GLEs or Ground Level Events, which are detected on the ground by
Neutron Monitors. The major events which represent the deepest
penetrations of SEP event effects typically occur only once or
twice per solar cycle, and the reason for their particularly
great fluxes of protons at high energies reaching into the GeV
range is still a subject of investigation. These events have
certain properties such as prompt arrival and high antisunward,
field-aligned anisotropies that affect the way they are
perceived on the ground. Brian Kress (Dartmouth) spoke on
the magnetospheric access of the SEPs, and coincidentally, on
the effect of the particle flux anisotropy on access to
high latitudes along open field lines. Simulations of the proton
access in MHD magnetosphere models show geomagnetic cutoffs will appear
different in measurements when significant anisotropies exist.
Thus ground (and LEO and atmosphere) exposure to SEP effects for the
most energetic events is somewhat less predictable using cutoffs
computed for isotropic incident fluxes. Tamitha Mulligan (Aerospace)
spoke on several recent large SEP events observed in both the
heliosphere and magnetosphere. She showed that there were features
in the magnetospheric time profiles not present in the interplanetary
time profiles, suggesting magnetospheric modulation of the intrinsic
time profiles, perhaps. Finally, Stan Solomon (HAO) spoke on the
recent modeling of SEP event effects in the atmosphere using the
WACCM (Whole Atmosphere Community Climate Model). This model can
trace the 3D dynamical and chemical effects of SEP events from the
top of the thermosphere to the ground. Stan showed some results
from Jackman and coworkers for some previous large proton events.
The NO and ozone chemistry effects can be seen to last for months
after the event, and to make their way well into the middle atmosphere-
and occasionally into the stratosphere. The potential for tracing
this full chain of SEP physics from end to end has never been greater.

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		+	'''Candidate GEM co-convener: Mary Hudson <mary.hudson [at] dartmouth.edu>'''

	A brief but productive discussion of the problem of SEPs (Solar		A brief but productive discussion of the problem of SEPs (Solar

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	'''Conveners: Janet Luhmann and Mary Hudson'''		'''Conveners: Janet Luhmann and Mary Hudson'''

SEPs from Heliosphere to Magnetosphere - Revision history

Gemeditor at 23:10, 11 July 2008

Gemeditor at 23:08, 11 July 2008

Gemeditor: New page: == SEPs from the Heliosphere to the Magnetosphere == '''Conveners: Janet Luhmann and Mary Hudson''' A brief but productive discussion of the problem of SEPs (Solar Energetic Particles) f...