[IGPP Everyone] AOS270 Seminar, Wed. Feb. 11th: Exploring magnetosphere-ionosphere-thermosphere coupling using aurora: Role of transient fast flows (Y. Nakamura, UCLA AOS)

[Emmanuel V. Masongsong]

Department of Atmospheric and Oceanic Sciences Seminar 



AOS270 




Wednesday, February 11, 2015 

3:30 PM to 4:30 PM 

MSB 7124 



Yukitoshi Nishimura 

Researcher, Atmospheric & Oceanic Sciences 

University of California, Los Angeles 






“Exploring magnetosphere-ionosphere-thermosphere coupling using aurora: Role of transient fast flows” 





ABSTRACT: 



Aurora, optical emissions in the upper polar atmosphere, reflects a variety of space phenomena around the Earth, and thus optical observations can be used for remote sensing of space environment. Auroral phenomena are not only important for Space Physics but also impact human society and the upper-middle atmosphere during large space weather events. This talk will firstly introduce a few examples of those, and then present recent progresses in auroral research particularly on the following three science questions. (1) Is there any auroral precursor to substorm onset? (2) Where do auroral precursors (magnetotail flows) originate? Is magnetic reconnection spontaneous or driven? (3) How does the magnetotail interact with the inner magnetosphere? Results from auroral imaging, radars and satellites emphasize that transient flows from dayside to nightside are important for driving nightside aurora and plasma sheet flows. Also found is that such plasma sheet flows influence inner magnetospheric phenomena including subauroral fast flows and diffuse aurora. Finally, I will describe my future research plans of (1) storm-time neutral atmospheric response, (2) the role of localized, transient flows in the magnetosphere-ionosphere-thermosphere system, and (3) the development of convection electric field through the ionosphere-atmosphere waveguide. 
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