*************************** ** THE GEM MESSENGER ** *************************** Volume 23, Number 31 November 4, 2013 ---------------------------------------------------------------------- 2013 Workshop Report from the Tail-Inner Magnetosphere Interaction Focus Group ---------------------------------------------------------------------- From: John Lyon and Frank Toffoletto We discussed four topic areas: 1. Origin and evolution of BBFs and related phenomena: Raeder and El Alaoui discussed their MHD simulations. In each case they found BBF-like structures. Birn and Sitnov both showed results from PIC simulations for magnetotail-like situations. They both found broad dipolarization fronts (DF's). Wang used the Rice Convection Model (RCM) to show how low entropy bubble could form in the tail. Drake discussed how the Hall current could give rise to the initial Bz dip observed in front of dipolarization fronts. 2. The impact of BBFs and other phenomena on transport during different levels of activity (e.g., quiet times, SMCs, substorms, storm main phases): Zhou discussed the observed effects of an interplanetary shock on the mid-tail. Gdioulidou showed RBSPICE data of multiple ion injections during a storm. Sitnov and Yang (RCM-E) modeled moderate storm events. Sitnov used an empirical model based upon the recent TS07D magnetic field model. Yang used the RCM-E - Rice convection model with an equilibrium magnetic field. Ohtani showed EUV solar cycle effects on Region 1 currents. Kissinger found in a statistical study relatively more SMC's in storm recovery phase. 3. The impact of BBFs et al on the inner magnetosphere: Runov found oscillations at 8 RE apparently caused by a precursor of the DF. Zhang discussed ion "trunks" in RBSP data near perigee. Ukhorskiy showed a model for DF quasi-trapping of ions. Gabrielse found particles could be injected by a channel using a strong potential (not inductive) field. Claudepierre discussed ULF waves in LFM driven by long period pressure waves in the solar wind. 4. Auroral streamers and other ionospheric signatures of BBFs: Nishimura and Zou showed separate airglow and radar data of a flow channel in the open polar cap that led to a PBI and streamer when it reached the open-closed boundary. Lotko discussed the question of how ionospheric conductance affects flux transport in the tail. Angelopoulos found correlation of ECH waves with DF's. There were also few possibilities discussed for coordinated workshops. 1. In July/Aug 2013 Artemis/Themis will be in the tail in drift conjunction with the Van Allen Probes and possibly Cluster and Geotail. (This needs to be checked.) 2. Two Themis events that Andrei Runov has looked at in some detail (April 4&8, 2009) 3. Modeling challenge to reproduce the polar cap flows that are observed to lead to streamers as observed by Nishimura. +-------------------------------------------------------------------+ | 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. | | | | GEM Messenger is also posted online via newsfeed at | | http://heliophysics.blogspot.com and | | http://www.facebook.com/heliophysics | | | | Back issues are available at ftp://igpp.ucla.edu/scratch/gem/ | | | | URL of GEM Home Page: http://aten.igpp.ucla.edu/gemwiki | | Workshop Information: http://www.cpe.vt.edu/gem/index.html | +-------------------------------------------------------------------+