National Aeronautics and Space Administration

Living With A Star

Targeted Research and Technology

Thermal upwelling of neutral particles at high latitudes

ROSES ID: NNH07ZDA001N      Selection Year: 2008      

Program Element: Focused Science Topic

Principal Investigator: Marc Lessard

Affiliation(s): University of New Hampshire

Project Member(s):
Lund, Eric J Co-I null
CROWLEY, GEOFFREY Co-I/Institutional PI null
Otto, Antonius Co-I/Institutional PI University of Alaska
Sadler, Brent Graduate/Undergraduate Student University of New Hampshire


Recent results from the CHAMP satellite show the persistence of neutral gas density enhancements at 400+ km in the cusp region. These observations were made using the ultra-sensitive accelerometer on CHAMP and, by comparison with CHAMP magnetic field data, were determined to be associated with strong field-aligned currents in the northern hemisphere cusp region. Unlike the situation at lower latitudes, attempts to understand density enhancements in this region in terms of Joule heating alone have not been successful; competing theories have since been put forth that attribute the upwelling to electrodynamic processes in the cusp, such as those related to ion outflow, etc. The goal of this project is to determine the extent these competing processes contribute. This will be accomplished with an effort that combines data analysis, numerical results of large-scale Joule heating and numerical results of electrodynamic processes. The approach will be to examine data from the FAST satellite during several of its conjunctions with CHAMP, which have already been identified. These data will both support the analytical aspect of this project, as well as provide input for the numerical studies.


Performance YearReferenceInvestigation TypeActions
1Sadler, F. Brent; Lessard, Marc; Lund, Eric; Otto, A...
not set


Performance YearReferenceActions
1Sadler, B.; Lessard, M. R.; Lund, E.; Luhr, H.; Cro...
1Sadler, B.; Lessard, M.; Lund, E. J.; Luhr, H.; Mar...
1Sadler, B.; Otto, A.; Lessard, M.; Lund, E. J.; Luh...
1Sadler, B.; Lessard, M.; Otto, A.; Hu, H.; Luhr, H....
1Sadler, B.; Lessard, M.; (2013), Temporal Evolution of El...

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