13-19 June 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

Determining the equatorial dayside plasma density using travel-time magnetoseismology

17 Jun 2015, 19:10
2m
CCIS Ground Floor PCL lounge (University of Alberta)

CCIS Ground Floor PCL lounge

University of Alberta

Poster (Student, In Competition) / Affiche (Étudiant(e), inscrit à la compétition) Atmospheric and Space Physics / Physique atmosphérique et de l'espace (DASP-DPAE) DASP Poster Session with beer / Session d'affiches avec bière DPAE

Speaker

Mr Robert Ridgway (University of Calgary)

Description

Plasma density in the outer terrestrial magnetosphere is highly variable, both in space and time. Spacecraft observations are very sparse, and photoelectric charging makes direct in-situ measurements extremely challenging. In this report we present a new remote sensing method which could be a significant source of information about conditions in the dayside magnetosphere. This technique uses a novel approach to travel-time magnetoseismology based on the relationship between solar wind pressure and magnetospheric currents. Travel-time magnetoseismology has had previous success in the inner magnetosphere and our approach adapts it for use for the outer magnetosphere. Observed time delays between solar wind forcing and response at geostationary orbit are attributed to compressional mode propagation in the equatorial plane. Alfvén speeds are modeled using a dipole geomagnetic field and plasma density profiles from the IGRF and Gallagher et al. Preliminary results show very good agreement between the model and observations. Future work will include the application of inversion techniques to recover 2D maps of equatorial plasma density in the dayside magnetosphere.

Primary author

Mr Robert Ridgway (University of Calgary)

Co-author

Prof. Brian Jackel (University of Calgary)

Presentation Materials