[IGPP Everyone] Reminder - Space Physics Seminar - Spring Quarter - Friday - April 12, 2019

[Marjorie Sowmendran]

Reminder – Friday – April 12, 2019

SPACE PHYSICS SEMINAR

DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES

DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES

UNIVERSITY OF CALIFORNIA, LOS ANGELES

(AOS M275C, EPSS M288C)





Shock associated whistler waves observed by MMS



Hanying Wei



EPSS/UCLA



ABSTRACT

Whistler waves have been observed frequently in the upstream foot region of planetary bow shocks and interplanetary shocks. These waves are believed to be created in the shock ramp and propagate towards upstream as standing wave packets in the shock frame. We present case studies on the interplanetary shock and bow shock observations from the electromagnetic fields and plasma instruments on board of Magnetosphere Multiscale (MMS) spacecraft. The Mach number of the interplanetary shock is marginally super critical but smaller than the critical Mach number for whistler wave propagation, thus these whistler waves could propagate from their origin at the ramp to the upstream. On the other hand, even though the Mach number of Earth’s bow shock is usually higher, upstream whistlers are also seen when the shock Mach number is less than the whistler critical Mach number. By studying the whistler waves upstream of the interplanetary shock and of the Earth bow shock, we can understand the wave properties for shocks of different Mach numbers, as well as the wave’s roles in affecting the upstream plasma parameters and shock dissipation.



Friday, April 12, 2019

Room 6704 Geology

3:30 - 5:00 PM

Presiding: Y. J. Ma  

In-Charge: C. T. Russell 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.igpp.ucla.edu/pipermail/everyone/attachments/20190410/5c5c589c/attachment.html>