[IGPP Everyone] Today - Reminder - SPACE PHYSICS SEMINAR - Fall Quarter - Friday October 23, 2020 - 3:30pm - UCLA Zoom

[Marjorie Sowmendran]

T o d a y 


SPACE PHYSICS SEMINAR 



ZOOM LINK PROVIDED BELOW 








https://ucla.zoom.us/j/93382900867?pwd=TlVQRmZyVEJFa0FCZWlRMU0yREtjUT09 







Date/Time: October 23, 2020/ 03:30 PM Pacific Time (US and Canada) 







SPACE PHYSICS SEMINAR 

DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES 

DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES 

UNIVERSITY OF CALIFORNIA, LOS ANGELES 



Quasiperiodic 1-hour Alfvén Wave Resonances in Saturn's Magnetosphere: Theory for a Realistic Plasma/Field Model 

Liutauras Rusaitis 
EPSS UCLA 

We model the omnipresent quasi-periodic 60-minute waves in Saturn's outer magnetosphere as field line resonances adopting a realistic magnetic field model and a measurement-based plasma density distribution using Alfvén wave resonance theory for arbitrary field geometries (Singer, 1981). The modeled eigenfrequencies for the second and higher modes are roughly independent of invariant latitude, mapping into large regions of the magnetosphere up to at least 20 RS, and the third and fourth harmonic modes having close to 1-hour eigenperiod. The model predicts the normalized amplitudes of these higher modes of the magnetic field perturbations at high latitudes to exceed the amplitudes at the plasma sheet, in agreement with the observations of more frequent occurrences at mid-to-high latitudes. The periods of the higher-order field line resonances in the outer magnetosphere differ considerably from those in a dipole model, illustrating the importance of a realistic field model. 



Friday, October 23, 2020 

3:30 - 5:00 PM 



In-Charge: Marco Velli 












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