--------------------------------------------------------- Reports of Boundary Layer Campaign Working Group Meetings Snowmass, Colorado, June 28-30, 1992 --------------------------------------------------------- Report of GEM Working Group 1: Reconnection Electric Field and Magnetopause Boundary Normal Magnetic Field O. de la Beaujardiere and L. R. Lyons (co-chairs) Our working group had an extremely successful workshop that was filled with important contributions from a large number of individuals. The primary goals of our working group are to evaluate the dayside reconnection electric field and the normal component of magnetic field at the magnetopause. Our approach is to evaluate ionospheric plasma transport in the vicinity of the boundary between open and closed field lines and dayside boundary layers and the large-scale transport over the polar caps. Our analysis is being performed using ground-based and polar-orbiting satellite data, and our results are to be compared with models (MHD and non-MHD) of high-latitude convection to test and improve the models' distribution of magnetic field normal to the magnetopause. To pursue our goals, six specific coordinated observing campaigns were organized prior to the workshop. Specific campaign dates and approximate UT times are: 22 Dec 91, 09 - 22 UT; 6 and 7 Jan 92 , 05 - 13 UT; 27 Jan 92, 0940 UT - 29 Jan, 18 UT; 20 March 92, 10 - 18 UT; 28 and 29 March 92, 05 - 20 UT; 2 and 3 Aug. 1991, 1200 - 1600 UT. Data from four of the campaigns were considered during the workshop, leading to a large number of planned joint studies. Enthusiasm was so high that a large number of individual wanted to present results from the GEM campaigns at the Fall, 1992 AGU meeting. As a result, a special AGU session entitled "Processes Near the Dayside Magnetic Separatrix and Boundary Layers as Observed in the Ionosphere" has been arranged, and we encourage the submittal to this session of papers describing results from GEM observing campaigns as well as other relevant results. We first focussed on the campaign period Jan. 27-29, 1992. There are long periods of relatively steady IMF having significant Bx and By components. Excellent, yet preliminary, polar-cap potentials from AMIE were presented by Gang Lu of NCAR/HAO. These patterns showed significant hemispheric differences and should be valuable for comparison with model results. A large amount of ground- based data is still to be incorporated into the AMIE runs, and we anticipate that the final potential patterns will be among the most accurate ever determined. Papers and Fall AGU talks on this campaign that were planned at the workshop by participants are: Lu, with data from many others: AMIE potential patterns (paper, talk) Rich et al.: Mantle flow patterns relative to the IMF direction (paper and talk if get good results): Lyons, Rich, Lu, de la Beaujardiere et al.: Determine particle boundaries and relate to AMIE potential patterns (paper) Baker, de la Beaujardiere, Lyons: Combine Sondrestrom and Goose Bay data to get two-dimensional electric field maps with high spatial and temporal resolution; add particle boundaries (at least one paper, talk) Watermann, de la Beaujardiere: Fold Sondrestrom ne and Te data into study (paper, talk) Rogers, Lu: Relate F-region patches on night side to potential patterns on day side (paper, talk) Papitashvili: Results from electrodynamic parameter model (talk) Onsager: Use f(v) plots to map particle distributions back to the magnetopause (paper, talk?) Lyons et al.: Test models with AMIE potential patterns and boundaries from this and other campaigns (paper eventually) Excellent data is also available for the campaign period March 28-29, 1992, and cusp coverage is particularly good on the 29th from Goose Bay. We decided to pursue the analysis of data from this campaign by first combining the Goose Bay and Sondrestrom data to obtain local 2-D convection patterns. AMIE will be applied by Gang Lu after completing her analysis of the Jan. 27-29 campaign data. The campaign period Jan. 6-7, 1992 has unique radar, optical and induction coil B cusp observations from Svalbard in darkness, as well as excellent global data from polar- orbiting satellites, radars, and magnetometers. AMIE runs for this period will be pursued by Gang Lu, but only after she analyzes her results from the above two campaigns. Specific plans for this campaign at this time are: Lockwood, McHarg, Minnow: Bring radar, optical, and induction coil data together (at least one paper, 3 talks) Lu et al.: AMIE runs (paper eventually) de la Beaujardiere, Lockwood: Sondrestrom-Eiscat comparisons (paper) Dramatic dayside field oscillations directly related to oscillations in the IMF By-component were observed on the day side during the campaign period Aug. 2-3, 1991. These oscillations demonstrate strong coupling between the interplanetary and convection electric fields. Specific plans for this campaign at this time are: Stauning et al.: Greenland and IMF data showing direct connection (paper almost ready, talk) Rosenberg, Stauning, AT&T magnetograms: Conjugate study of oscillations (paper, talk) Fraser, Arnoldy: Antarctic wave data on day side (paper?) Rogers: PACE data oscillations (paper?) de la Beaujardiere, Clauer, Stauning, Baker: Comparison of oscillations with Sondrestrom and Goose Bay day (paper, talk?)