[Everyone] Space Physics Seminar, Friday May 23rd: Understanding the Composition of Solar Energetic Particle Events (C. Cohen, Caltech)

[Emmanuel V. Masongsong]

SPACE PHYSICS SEMINAR 

DEPARTMENT OF EARTH, PLANETARY AND SPACE SCIENCES 

DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES 

UNIVERSITY OF CALIFORNIA, LOS ANGELES 

(EPSS M288A, AOS M275A ) 







Christina Cohen 


Caltech 





Understanding the Composition of Solar Energetic Particle Events 








Abstract: 


By the 1990’s sense had finally been made of the variable composition observed in solar energetic particle (SEP) events. The importance of solar flares was modified by the observation of coronal mass ejections (CMEs) and their ability to drive interplanetary shocks. The ‘two-class’ paradigm was established allowing the characteristics of an SEP event to be directly related to the acceleration mechanism at work. This neat picture was disrupted by the first observations from the Solar Isotope Spectrometer on the Advance Composition Explorer, launched in August 1997. Although the two acceleration mechanisms remain a distinguishing aspect of SEP events, additional puzzles have arisen in explaining the observed composition in some events. With the launch of the twin Solar Terrestrial Relations Observatory spacecraft in October 2006, the capability of routinely observing an SEP event from multiple vantage points was obtained. This talk will present the evolution in our understanding of SEP event composition, including how this new tool has contributed. 




Friday, May 23, 2014 

Room 6704 Geology 

3:30 - 5:00 PM 



Refreshments served after the seminar in Room 6850. 



In-Charge 
V. Angelopoulos 

X.-Z. Zhou 
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