[Grad-postdoc-assn] ASP seminar TOMORROW (29 April) by Michael Wiltberger (HAO/NCAR)
Hyeyum (Hailey) Shin
hshin at ucar.edu
Tue Apr 28 09:56:08 MDT 2015
The ASP seminar by Dr. Michael Wiltberger (HAO/NCAR) will take place
TOMORROW (29 April) at 11:00 am in the CG1 Center Auditorium, and will be
followed by lunch with the speaker in the CG cafeteria.
Here are detailed information about his seminar. Hope to see you all there!
Space Weather: What is it and how do we model it?
As we advance in the technological age our risk exposure to the space
weather, severe storms in the near-Earth space environment driven by the
complex magnetic field interactions at the Sun, continues to increase. The
alterations in the ionized portion of the upper atmosphere driven by
interaction of the complicated plasma and magnetic field structures emitted
by the Sun, aka CMEs, and the Earth’s magnetic field can lead to
significant degradations on the availability and accuracy of global
positioning system (GPS). This interaction can also impact high-frequency
(HF) radio communications forcing airlines to divert aircraft from
trans-polar routings to longer lower latitude routes at significant costs.
The severe storms can also drive strong currents in the electric power
grid, potentially leading to blackouts, and long-distance pipelines,
contributing to enhanced corrosion. Aspects of our understanding of the
basic science behind these affects are quite good, but work remains to be
done to create a robust, reliable, and effective set of forecast tools.
Modern modeling of space weather is accomplished through coupling of
regional models of the thermosphere, ionosphere, and magnetosphere that can
be driven by solar wind conditions taken from satellite observations or by
the results of models of solar wind driven by solar coronal simulations.
These numerical simulations can provide forecast of the space environment
and are beginning to be transitioned into operations at NOAA’s Space
Weather Prediction Center (SWPC) to provide information for government and
industrial users. High Performance Computing (HPC) platforms allow
simulations to be conducted at unprecedented resolution and over long
simulation intervals. The large data sets produced by these simulations
provide opportunities for novel discoveries through data mining. An
excellent example of this discovery process is linkage of bursty bulk flows
to magnetic reconnection in the mid-tail through high-resolution
simulations. The future of space weather modeling includes many challenges.
Key among these are the is the ability to predict the magnetic field inside
the CME, utilization of new modeling techniques such as hybrid methods
within the magnetospheric simulations, and development of a robust whole
on behalf of ASP seminar committee.
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