[IGPP Everyone] TOMORROW: AOS 270 Seminar Wednesday 3:30pm: “Time-dependent Global MHD Studies of the Solar Wind Interaction with Mars” (Yingjuan Ma, EPSS)

[Emmanuel V. Masongsong]

Please join us for the AOS 270 Seminar, Wednesday, May 25, 2016 with Yingjuan Ma ! 



Wednesday, May 25, 2016 

3:30PM to 4:30PM 

MS 7124 










Yingjuan Ma 

University of California, Los Angeles 



“Time-dependent Global MHD Studies of the Solar Wind Interaction with Mars” 

Abstract: 



Mars has only localized crustal magnetic fields, so the solar wind plasma flow interacts directly with the Mars atmosphere/ionosphere system. Such an interaction generates induced current in the ionosphere, modifies the magnetic field environment around Mars and more importantly causes the erosion of Martian atmosphere. Here we use a 3D time-dependent multi-species single-fluid MHD model to understand the plasma environment of Mars and quantify the ion loss rate. The effects of the crustal magnetic fields are discussed based on model results and their comparison with MGS (Mars Global Surveyor) magnetometer observations. Two event studies of MAVEN (Mars Atmosphere and Volatile Evolution) mission are also presented, one for quiet solar wind condition and the other for a strong ICME impact in March 2015. The ongoing MAVEN mission was designed to study the upper atmosphere, ionosphere, and magnetosphere of Mars, the response to solar and solar-wind input, and the ability of atmospheric molecules and atoms to escape to space. Through detailed comparisons between the model results and the relevant plasma observations from MAVEN, we find that the time-dependent global MHD model is able to reproduce the main features of the plasma environment around Mars for both quiet and disturbed solar wind conditions. Model results suggest that the total ion escape rate was enhanced by an order of magnitude during the ICME event, indicating space weather could have a significant impact on the total ion loss throughout Martian history. 






-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.igpp.ucla.edu/pipermail/everyone/attachments/20160524/640f0bb4/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.png
Type: image/png
Size: 9321 bytes
Desc: image003.png
URL: <http://lists.igpp.ucla.edu/pipermail/everyone/attachments/20160524/640f0bb4/attachment-0002.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.png
Type: image/png
Size: 56048 bytes
Desc: image005.png
URL: <http://lists.igpp.ucla.edu/pipermail/everyone/attachments/20160524/640f0bb4/attachment-0003.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: May 25- Yingjuan Ma.doc
Type: application/msword
Size: 251904 bytes
Desc: May 25- Yingjuan Ma.doc
URL: <http://lists.igpp.ucla.edu/pipermail/everyone/attachments/20160524/640f0bb4/attachment-0001.doc>