[IGPP Everyone] AOS 270 Seminar Wed. Jan 14, 3:30pm: Hot Flow Anomaly: Explosions at the Earth's Bow Shock (Hui Zhang, U. Alaska Fairbanks)

[Emmanuel V. Masongsong]

Hello, 
Please join us this Wednesday January 14 th for the AOS 270 Seminar with Hui Zhang ! 




Wednesday, January 14, 2015 

3:30 PM to 4:30 PM 

MSB 7124 


Hui Zhang 

Assistant Professor, Physics Department & Geophysical Institute, 

University of Alaska Fairbanks 



“Hot Flow Anomaly: Explosions at the Earth's Bow Shock” 





ABSTRACT: 



The Earth’s magnetic field carves out a cavity known as the magnetosphere in the solar wind ejected from the Sun’s upper atmosphere. A bow shock standing upstream from the magnetosphere serves to decelerate and deflect the supersonic solar wind, enabling it to flow around the magnetosphere. In gasdynamic and magnetohydrodynamic models, no information about the interaction reaches the region upstream from the bow shock. However, when kinetic effects are considered, hot flow anomalies (HFAs) form upstream from the Earth’s bow shock. HFAs exhibit dramatic plasma heating (by a factor of 10) 

and enormous flow deflections (sometimes even backward toward the Sun). Because HFAs drive magnetopause boundary waves, transmit compressional waves into the magnetosphere that can excite resonant ULF waves and cause particles to scatter into the loss cone and precipitate into the ionosphere, generate field-aligned currents in the magnetosphere that drive magnetic impulse events in the high-latitude ionosphere and trigger transient auroral brightenings, they are an essential aspect of the solar windmagnetosphere-ionosphereinteraction and deserve detailed study. From a theoretical point of view, they provide a fascinating example of local (microscale) phenomena having global effects. I will begin by providing a basic introduction to the Earth’s magnetospheric environment, and then introduce what are HFAs, why we study them. I will then discuss my work on evolutions of HFAs, particle heating inside HFAs, reconnection within an HFA, and the discovery of Spontaneous HFAs (SHFA). Finally, I will present an extreme HFA event greater than 10 Earth Radii and its geoeffects . 


University of California, Los Angeles 


http://www.atmos.ucla.edu 

Samantha Miller 
Academic Personnel & Administrative Specialist 
UCLA | Atmospheric & Oceanic Sciences Department 
7127 Math Sciences Building, 7th Floor 
Los Angeles, CA 90095-1565 
Tel: (310) 825-1217 
Fax: (310) 206-5219 





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