[IGPP Everyone] 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
emasongsong at igpp.ucla.edu
Tue Sep 20 10:13:56 PDT 2022
SPACE PHYSICS SEMINAR
DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES
DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES
UNIVERSITY OF CALIFORNIA, LOS ANGELES
ZOOM LINK PROVIDED BELOW
https://ucla.zoom.us/j/98070654630?pwd=aWdrSktueG9xWjU3cDZiQUhGRXV0UT09
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.
Friday, September 23rd, 2022
In-person in Slichter 3853, with refreshments afterwards on Franz Patio
3:30 - 4:30 PM
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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