[IGPP Everyone] TOMORROW: Space Physics Seminar, Fri. 1/19 3:30pm: "The terrestrial magnetopause - an asymmetric boundary" (S. Haaland, U. Bergen/MPI)

[Emmanuel V. Masongsong]

SPACE PHYSICS SEMINAR 
DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES 


DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES 

UNIVERSITY OF CALIFORNIA, LOS ANGELES 



The terrestrial magnetopause - an asymmetric boundary 



Stein Haaland 
Birkeland Centre for Space Science, University of Bergen, Norway and 
Max Planck Institute for Solar System Research 



When a sphere is put into a streaming gas, one would expect the diversion of the flow to be fairly rotationally symmetric about the flow direction. In the solar-wind-magnetosphere interaction, there are a number of processes that can break this symmetry. Some of the asymmetries can be attributed to pure mechanics of the Earth's celestial motion, and intermittent structures in the solar wind, but some of the asymmetries are persistent and related to electromagnetic forces. In this seminar we focus on observations from the terrestrial magnetopause - a current sheet that shields the Earth from the shocked solar wind and its embedded magnetic field. Measurements from the Cluster, THEMIS and MMS constellations of spacecraft show that persistent asymmetries between dawn and dusk flanks exist in key parameters such as current density, thickness and motion of the magnetopause. We also show how these asymmetries can set up corresponding north-south asymmetries in the magnetosphere and in the ionosphere. 






Friday, January 19, 2018 

Room 6704 Geology 

3:30 - 5:00 PM 



In Charge: 

V. Angelopoulos 

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