GMU Space Sciences Seminar

October 20, 2004

Dr. James L. Green
Chief, Space Science Data Operations Office
(NASA / Goddard Space Flight Center)

"New Insights from Imaging the Earth's Inner Magnetosphere"

TALK ABSTRACT:
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The Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) mission is the
first satellite mission that is dedicated to imaging the Earth's magnetosphere.
IMAGE utilizes the techniques of ultraviolet imaging, neutral atom imaging, and
radio plasma imaging to map out global distributions of the electron and proton
aurora; the helium ions of the plasmasphere; the ionospheric ion outflow; the 
medium-energy ions of the near-Earth plasma sheet, ring current, and polar cusp;
the high-energy ions of the ring current and trapped radiation belts; and the 
total plasma density from the ionosphere out to the magnetopause. Visuals from 
IMAGE have provided a fascinating look at how plasma (ionized gas) circulates 
within the magnetosphere geomagnetic storms. For instance, during less intense 
geomagnetic storms a partial ring current of hot plasma is observed coming from
the Earth's magnetotail tail and venting out of the front of the magnetosphere 
and into the solar wind rather than circulating around the Earth just outside 
the plasmasphere as expected. The plasmasphere is constantly battered by inner 
magnetospheric forces that peal off cold plasma, convect it sunward, and vent 
it out the magnetopause on the dayside and into the solar wind. These surprising
views of the magnetosphere and others will be discussed. In addition, the future
for magnetospheric imaging also looks bright, when techniques such as tomography
and interferometry will be applied to new space missions in the solar wind, in 
planetary magnetospheres, and moons of other planets. 
 

NASA SSDOO