[IGPP Everyone] TOMORROW: Space Physics seminar - Friday 9/23, 3:30 PM PDT - Alfvénic Wave Resonances in the Kronian and Terrestrial Magnetospheres: Modeling and Observations (L. Rusaitis, UCLA EPSS)

[Emmanuel Masongsong]

SPACE PHYSICS SEMINAR 




DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES 

DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES 
UNIVERSITY OF CALIFORNIA, LOS ANGELES 

Friday, September 23rd, 2022 
3:30 - 4:30 PM 

In-person in Slichter 3853, with refreshments afterwards on Franz Patio 






Alfvénic Wave Resonances in the Kronian and Terrestrial Magnetospheres: Modeling and Observations 


Liutauras Rusaitis 
UCLA EPSS 
Ultra-low frequency (ULF) waves have been commonly detected in inner and outer Solar System planetary magnetospheres. ULF waves with periods that are of the order of the Alfvén wave transit time in a planetary magnetosphere are often associated with resonant field lines that can be excited by either internal or external triggers. We present a calculation of standing wave resonances in a realistic model of Saturn’s magnetosphere. We examined magnetic field data and found that observed 30-, 60-, and 120-minute magnetic perturbations correspond to even-mode oscillations. We find the quasiperiodic waves waves at Saturn reoccur consistently at a PPO period, with the highest transverse to parallel magnetic perturbation power in the post-dusk sector, suggesting mainly an internal driver such as the vertical flapping of the magnetotail. At Earth, the field line resonances that are associated with Pc4 to Pc5 waves do not demonstrate similar periodicity in reoccurrence as at Saturn and are likely to be driven externally by processes such as the solar wind dynamic pressure variations. We compare the terrestrial eigenperiods to the observed ULF wave periods. 


Zoom link: https://ucla.zoom.us/j/98070654630?pwd=aWdrSktueG9xWjU3cDZiQUhGRXV0UT09 



In-Charge: Vassilis Angelopoulos 



Fall Space Physics Seminar schedule: 



September 23, 2022 - Liutauras Rusaitis, UCLA EPSS 
ULF resonances in planetary magnetospheres 

September 30, 2022 - Akhtar Ardakani, UNH 
The role of O+ in dynamics of the earths magnetotail 

October 7, 2022 - Elena Kronberg, Univ. of Munich 
Predicting and understanding the energetic particle dynamics using Cluster observations 

October 14, 2022 - Camilla Harris, NASA JPL 
Multi-fluid MHD Modeling of Europa’s Plasma Interaction 

October 21, 2022 - Terry Liu, UCLA EPSS 
Modeling the Formation and Expansion of Foreshock Transients 

October 28, 2022 - Kent Tobiska, Space Envt. Technologies 
Radiation hazards as a major space weather on commercial and suborbital aviation 

November 4, 2022 - Ben Lynch, UCB SSL 
Solar wind (TBC) 

November 11, 2022 - Veterans Day - no seminar 

November 18, 2022 - Mike Shumko, NASA/GSFC 
The Association of Relativistic Electron Microbursts With the Aurora 

November 25, 2022 - Thanksgiving - no seminar 

December 2, 2022 - Christine Gabrielse-Lin, Aerospace Corp. 
Estimating Precipitating Energy Flux, Average Energy, and Hall Auroral Conductance From THEMIS All-Sky-Imagers With Focus on Mesoscales 




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