*************************** ** THE GEM MESSENGER ** *************************** Volume 23, Number 28 September 9, 2013 ---------------------------------------------------------------------- 1. 2013 Workshop Report from the Scientific Magnetic Mapping and Techniques Focus Group ---------------------------------------------------------------------- From: Robyn Millan, Elizabeth MacDonald, Eric Donovan The Scientific Magnetic Mapping and Techniques focus group held three sessions at the recent GEM meeting, including one joint session with the Substorm Expansion Onset focus group. The first session focused on recent mapping-related results from newer missions, including the Van Allen Probes and BARREL. Several speakers discussed an event that occurred on November 14, 2012. Toshi Nishimura used observations of pulsating aurora to map the location of the two Van Allen Probes during this event. Liz MacDonald discussed observations from the HOPE instrument which indicate when the Van Allen Probes crossed into the lobe. Mei-Ching Fok used the BATSRUS and CRCM models to try to explain the observed lobe crossings. An injection event on February 2, 2013 was also discussed by several speakers. Alexa Halford presented an overview of the BARREL balloon campaign and showed observations of precipitation observed near the footpoints of the Van Allen Probes during this deep injection on Feb 2. Joe Fennel showed MagEIS observations of the injection for this event. Finally, Joe Baker gave a presentation about SuperDARN and measurements at the low altitude footprints of the Van Allen Probes. The second mapping session included a potpourri of mapping techniques. Mike Henderson showed examples of phase space density matching using Van Allen Probe data in order to test magnetic field models. Following that talk, we discussed how this kind of information could be used as input to improve the models. Yue Chao discussed a 3D force balance magnetic field model, and Mike Schulz reviewed some of his previous work on source-surface mapping of open closed boundary. Jone Peter Reistad presented on global auroral imaging of both auroral ovals as a tracer of true conjugate regions. Shasha Zhou also discussed the open- closed boundary and compared coupled models with observations. Finally, Asher Pembroke discussed using spherical barycentric coordinates in magnetic field modeling, and Lutz Rastaetter led a discussion of CCMC current and future mapping services. The third magnetic mapping session was joint with the Substorm Expansion Onset focus group. Matina Gkioulidou presented RBSPICE observations of the same February 2 deep injection event discussed in our first session. Eric Donovan and Tetsuo Motoba both discussed identifying conjugacy between the ground and satellites during onset. Robyn Millan presented Phil Erickson's slides on comparisons between in situ and ground-based measurements of electric fields during substorms. Xiangning Chu discussed magnetic perturbation of the substorm current wedge. The session was concluded with a discussion about future plans. The plan going forward is for the magnetic mapping focus group to focus on 2 events and have an old-fashioned GEM Challenge. We'll come together at mini-GEM to discuss the first results. The two challenges are: • 'Who's afraid of the OCB (open-closed boundary)?' coordinated by Liz MacDonald, featuring the storm-time lobe crossing events of Nov 14, 2012 as seen by both RBSP spacecraft. • 'More fun than a BARREL of monkeys' coordinated by Robyn Millan, featuring the quiet-time BARREL-RBSP wave and precipitation conjunctions for 2/2/13. If you'd like to participate, please register here: http://bit.ly/gem_challenge. All of the GEM presentations for the mapping focus group are also posted on our wiki http://bit.ly/gem_mapping. +-------------------------------------------------------------------+ | The GEM Messenger is the electronic newsletter for the | | NSF GEM Program and Workshops. | | | | Editor: Peter Chi, GEM Communications Coordinator | | E-mail: | | | | To subscribe GEM Messengers, send an e-mail message to: | | | | with the following command in the body of your e-mail: | | subscribe gem | | To remove your e-mail address from the list, the command is: | | unsubscribe gem | | | | 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 | +-------------------------------------------------------------------+