[IGPP Everyone] 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]

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/20220927/7b990c89/attachment.html>