[IGPP Everyone] NOW: Space Physics Seminar, Fri. 3/1, 3:30pm: "Upstream in the Lab: ion-resonant "ULF" waves in LAPD" (M. Weidl, UCLA Physics)

[Emmanuel V. Masongsong]

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) 

Upstream in the Lab: ion-resonant "ULF" waves in LAPD 

Martin Weidl 
UCLA Physics 

For space physicists, a bow shock generates a beam of reflected ions, which excite ultra-low-frequency waves in the upstream plasma that flows into the shock. At the Large Plasma Device, our goal is to achieve the opposite: We use a dense beam of laser-ablated ions to excite ion-cyclotron waves and study the early stages of the formation of a parallel collisionless shock. These waves actually lie in the HF band (λ ~ decameter scale) for our magnetic field strength, which allows us to probe their spatial structure. After a short theory primer on how left- and right-hand polarized waves can form a shock front, I will analyze the saturation of the instabilities behind these waves in hybrid simulations and present LAPD measurements of the right-hand resonant instability and the current-density structure that it induces in the background plasma. 

Friday, March 1 , 2019 
Room 6704 Geology 
3:30 - 5:00 PM 

In Charge: 
V. Angelopoulos 

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