The Global Implications and Grand Challenge of Neutral-Ion Interactions in the Polar Regions (Invited)

Details The Global Implications and Grand Challenge of Neutral-Ion Interactions in the Polar Regions (Invited) The Global Implications and Grand Challenge of Neutral-Ion Interactions in the Polar Regions (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa53b..04t&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA53B-04

Physics

[0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition

Scientific paper

That the smallest of interactions occurring between neutrals and ions in the polar thermosphere can impact the largest of scales in thermosphere response is a testament to the primary importance of the Joule heating rate as an energy source for the thermosphere. Yet, our understanding/quantification of this primary energy source is woefully represented by numerical models and poorly sampled by measurement. For numerical models, the Joule heating rate requires parameterizations to account for the presumed “missing” energy in the simulations, while, for measurements, numerous approximations abound. In addition to being a primary thermosphere energy source, the Joule heating rate also represents a collective of neutral and ion interactions that result from solar wind and solar processes and exchange processes among the thermosphere, ionosphere and magnetosphere. Thus, to properly simulate the Joule heating rate requires a system perspective. Furthermore, to properly observe the Joule heating rate requires measurements of the ionosphere-thermosphere system at high temporal and spatial scales. This remains a very difficult task. The estimation and modeling of the Joule heating rate represents a grand challenge that involves the entire sun-earth system. This talk will put into perspective the current state in addressing the challenge of capturing this illusive source of energy.

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