[IGPP Everyone] TODAY: Space Physics seminar - Friday 9/30, 3:30 PM PDT - The Role of O+ on the Onset and Development of Reconnection in the Earth’s Magnetotail (A. Ardakani, UNH)
Emmanuel Masongsong
emasongsong at igpp.ucla.edu
Fri Sep 30 13:56:53 PDT 2022
SPACE PHYSICS SEMINAR
DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES
DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES
UNIVERSITY OF CALIFORNIA, LOS ANGELES
Friday, September 30th, 2022
3:30 - 4:30 PM
In-person in Slichter 3853, with refreshments afterwards on Franz Patio
The Role of O+ on the Onset and Development of Reconnection in the Earth’s Magnetotail
Akhtar Ardakani
Univ. of New Hampshire
Understanding the effects of multi-scales on the onset of collisionless magnetic reconnection in the earth’s magnetotail during substorms and storms, requires understanding of the balance between local and global processes and how these processes are affected by the presence of the heavier O+ ions of ionospheric origin. The presence of ionospheric oxygen ions (O+) can potentially affect the dynamics of the Earth’s magnetotail during the substorm phases. For example, the mass loading of the reconnection inflow region due to the O+ ions, leads to the reduction of the reconnected flux rate. However, in a realistic magnetosphere the higher O+ content is highly correlated with more disturbed conditions; together with the increase in the O+ content, the lobe magnetic field and the tail pressure are also substantially modified. Analyzing Cluster and MMS observations of X-line encounters in the Earth’s magnetotail we find that while the normalized reconnection rate is independent of the mass density in the plasma sheet, the rate of reconnected flux does increase with a higher density of O+ in the plasma sheet. To assess the role of global and meso-scales in the substorm onset and development, we use for the first time 3D global hybrid simulations (HYPERS code) to study the build-up of the O+ ions in the magnetotail by launching O+ outflows. Preliminary results suggest that the presence of O+ can induce X-lines at locations where magnetic reconnection does not occur in simulations without O+ outflows.
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.igpp.ucla.edu/pipermail/everyone/attachments/20220930/e00cf2ce/attachment.html>
More information about the Everyone
mailing list