Table of Contents ============================================================================ 1. GEM "GGCM Metrics and Validation" Focus Group: Call for Participation 2. GEM "Dayside Magnetopause Reconnection" Focus Group: Call for Participation ============================================================================ *************************** ** THE GEM MESSENGER ** *************************** Volume 19, Number 9 May 18, 2009 ---------------------------------------------------------------------------- 1. GEM "GGCM Metrics and Validation" Focus Group: Call for Participation ---------------------------------------------------------------------------- From: Aaron Ridley and Masha Kuznetsova The GGCM Metrics and Validation Focus Group would like to invite modelers to participate in a model comparison. The goal of this comparison is to examine how the different models handle basic solar wind and interplanetary magnetic field coupling with the magnetosphere. We invite modelers to bring simulation results in which the following conditions are simulated: 0. Zero dipole tilt. 1. Constant Pedersen conductances in the ionosphere of 5 mho. Zero Hall conductance. This condition is to simplify things, since everyone has a different implementation of the aurora. We need to discuss how to do a more realistic conductance, but have everyone do the same thing. We will discuss this at GEM. 2. Solar wind density is constant at 5/cc. Temperature is constant at 100,000 K. Vx is constant at -400 km/s, while Vy and Vz = 0. 3. The IMF starts at Bz=-5 nT, By=Bx=0.0. And varies as the following: yyyy mm dd hh mm ss Bx By Bz 2000 03 21 00 00 00 0.0 0.0 -5.0 2000 03 21 02 00 00 0.0 0.0 -5.0 2000 03 21 02 10 00 0.0 0.0 -10.0 2000 03 21 04 00 00 0.0 0.0 -10.0 2000 03 21 04 10 00 0.0 0.0 -20.0 2000 03 21 06 00 00 0.0 0.0 -20.0 2000 03 21 06 10 00 0.0 0.0 -30.0 2000 03 21 08 00 00 0.0 0.0 -30.0 2000 03 21 08 10 00 0.0 0.0 -40.0 2000 03 21 10 00 00 0.0 0.0 -40.0 2000 03 21 10 10 00 0.0 0.0 -50.0 2000 03 21 12 00 00 0.0 0.0 -50.0 We would like to examine: 1. The ionospheric potential patterns and the cross polar cap potential. Please bring plots of the CPCP versus time for the entire time period. 2. The mapping of currents from the ionosphere to the magnetosphere (and beyond, as some see it.) 3. The development of the ring current. Please bring plots of Dst (if you can calculate Dst). 4. The structure of the magnetosphere, including: (a) the position of the magnetopause and bow shock - please bring plots of the magnetopause location and bowshock location versus time; (b) the length of the tail - please bring plots of the location of the last closed field-line (in the magnetosphere) versus time; and (c) the shape of the magnetosphere - please bring plots of the magnetospheric current (Jy), plotting from X=~-100->~32; z=~-50->~50 at times just before the IMF Bz changes orientation (i.e., 1:45, 3:45, 5:45, 7:45, 9:45, 11:45). We are more than willing to consider other models, rather than just global MHD simulations. For example, empirical models could be utilized. Ring current models could also be utilized (one of the interesting issues that is being discussed is whether there is saturation of the inner magnetosphere when the outer magnetosphere is saturated). We would also like to discuss varying different parameters, if other are interested. We will discuss this further at GEM. Aaron Ridley and Masha Kuznetsova ---------------------------------------------------------------------------- 2. GEM "Dayside Magnetopause Reconnection" Focus Group: Call for Participation ---------------------------------------------------------------------------- From: Jean Berchem Nick Omidi We are soliciting contributions to the Dayside Magnetopause Reconnection session that will be held at the upcoming GEM workshop in Snowmass on June 21-26, 2009. The session will bring together people interested in the occurrence of magnetic reconnection at the dayside magnetopause. Given the wide range of scales involved in reconnection processes, the discussion will address both local and global aspects through a variety of modeling techniques including full particle, hybrid, multi-fluid and MHD simulations, as well as in-situ and ground-based observations. Our main goals this year will be to summarize recent progress and to focus on outstanding questions. Since the session will be held in a workshop style, each speaker is encouraged to present only a few slides to ensure enough time for discussion. To facilitate scheduling, please send us a tentative title for your contribution at your earliest convenience. Jean Berchem and Nick Omidi +-------------------------------------------------------------------------+ |To subscribe GEM Messengers, send an e-mail to | | with the following command in the body of your e-mail message: | | subscribe gem | |To remove yourself from the mailing list, the command is: | | unsubscribe gem | | | |To broadcast a message to the GEM community, please contact Peter Chi at | | | |Please use plain text as the format of your submission. | | | |URL of GEM Home Page: http://aten.igpp.ucla.edu/GemWiki | |Workshop Information: http://www.cpe.vt.edu/gem/index.html | +-------------------------------------------------------------------------+