National Aeronautics and Space Administration

Living With A Star

Targeted Research and Technology

Sub-Auroral Polarization Streams Effects on the Ionosphere and Thermosphere

ROSES ID: NNH05ZDA001N      Selection Year: 2006      

Program Element: Focused Science Topic

Principal Investigator: Elsayed Talaat

Affiliation(s): The Johns Hopkins Universtiy Applied Physics Laboratory

Project Member(s):
Anderson, Brian J Co-I JHU/APL
Hairston, Marc Co-I University of Texas at Dallas
Paxton, Larry J Co-I Johns Hopkins University
Sotirelis, Thomas Co-I JHU/APL
Yee, Jeng-Hwa Co-I Johns Hopkins University, Applied Physics Laboratory
Rich, Frederick J. Collaborator MIT Lincoln Laboratory
Ruohoniemi, John Michael Collaborator Virginia Polytechnic and State University
Greenwald, Raymond A. Collaborator null
Brandt, Pontus C. Collaborator The Johns Hopkins University Applied Physics Laboratory


The coupling processes within the magnetosphere/ionosphere/thermosphere system are a key area of research in the Sun Earth Connections theme. One dramatic manifestation of this coupling is enhanced sub-auroral electric fields, labeled sub-auroral polarization streams (SAPS) or sub-auroral ion drifts (SAID) (Galperin et al., 1973; Spiro et al., 1978, respectively). These events are of great importance in determining the temporal evolution of the ring current and thermal plasma distribution in the magnetosphere, ionosphere and plasmasphere.

In this proposal we will create a climatological picture of SAPS/SAID, including their conjugacy, frequency, and intensity. We will also investigate the mechanisms behind their formation and duration and the effect that SAPS/SAID have on ionospheric density and thermospheric composition through analysis of multi-satellite observations and simulations using the NCAR Thermosphere Ionosphere Electrodynamics General Circulation Model (TIE-GCM).


Performance YearReferenceInvestigation TypeActions
1Ontiveros, Veronica; Vourlidas, Angelos; (2009), Quantita...
not set
1Vourlidas, Angelos; Ontiveros, Veronica; (2009), A Review...
not set


Performance YearReferenceActions
1Shepherd, S. G.; Cousins, E. D.; Ruohoniemi, J. M.;...
1Greenwald, R. A.; Ruohoniemi, J. M.; Shepherd, S. G....
1Ruohoniemi, J. M.; Clausen, L.; Baker, J. B.; Greenw...
1Vourlidas, A.; (2006), Detections of CME-Driven Shocks wit...
1Ontiveros, V. Z.; Vourlidas, A.; (2007), Signatures of C...
1Ontiveros, V.; Vourlidas, A.; (2007), How do CME-Shocks ...

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