GEM ULF Wave Modeling
We're organizing a modeling challenge to investigate the ability of global models to reproduce ULF wave fields in the magnetosphere, and ultimately if those ULF fields can radially diffuse an existing electron population from L~5.5 to L~4.5 in two weeks. To get there, we can split the question into two distinct ones:
1. Can global models of the magnetosphere reproduce the observed persistent, solar wind driven, low mode number ULF wave fields in the magnetosphere?
2. Are those waves capable of producing the observed energetic radiation belt population evolution observed during the first two weeks of March 2013 as observed by Van Allen Probes?
L-time plot of RBSP-ECT fluxes at 5.6 MeV energy with an event with radially inward diffusion circled.
Presentation on ULF challenge
T. Guild's summary charts [PDF]
Publications about ULF wave observation and modeling
- Sarris et al., "Mode number calculations of ULF field-line resonances using ground magnetometers and THEMIS measurements", JGR 118(11), 6986-6997, doi:10.1002/2012JA018307, 2013
- Claudepierre et al., "Solar wind driving of magnetospheric ULF waves: Field line resonances driven by dynamic pressure fluctuations", JGR 115, A11202, doi:10.1029/2010JA015399, 2010
- Hartinger et al., "The effect of magnetopause motion on fast mode resonance", JGR 119(10), 8212-8227, doi:10.1002/2014JA020401, 2014
- Rae et al., "Ground based Magnetometer determination of in situ PC4-5 ULF electric field wave spectra as a function of solar wind speed", JGR 117, A04221, doi:10.1029/2011JA017335, 2013
- Zhao Li et al., Modeling gradual diffusion changes in radiation belt electron phase space density for the March 2013 Van Allen Probes case study, JGR 119 (10),8396--8403, doi=10.1002/2014JA020359 (2014)
- A. J. Halford et al. BARREL observations of an ICME-shock impact with the magnetosphere and the resultant radiation belt electron loss}, JGR 120 (4),2557--2570, doi=10.1002/2014JA020873 (2015)
Simulation runs at CCMC
- 10mHz monochromatic density variation in solar wind (no pressure variation):Event simulationsGEM Workshop sessionsPlease send questions, comments and suggestions to Lutz Rastaetter and Tim Guild.
- Event: 2017/05/27 00:00 - 2017/05/29 00:00 with Solar EUV and auroral conductances:
- 106x48x64-cell grid with dr=0.2 near the Earth:
- 9.6 million grid cells with 1/4 RE resolution near Earth, 1/2 R_E throughout the upstream region:
- Full event (F10.7=84): run ULFEVENT_SWMF_040319_1 (run includes ground magnetic perturbations at selected magnetometers and on 2x2 degree grid)
- 511x120x120-cell dayside grid with 1/4 RE resolution near Earth with CTIM conductances:
- Adapt=6, grid with about 1,350,000 cells and 1/8 RE resolution near Earth:
- 2017/05/28 04:00 - 10:00, F10.7=81: simulation planned
- 2014 GEM Summer workshop
- 2014 mini-GEM
- 2015 GEM Summer Workshop: Metrics and Validation Focus Group, Wed. 13:30 - 15:00Motivation / Introduction:**Observations
- S. Claudepierre: GEM ULF Wave Challenge [PDF]
- Chih-Ping Wang: Observations (RBSP, THEMIS, Geotail) and simulations (LFM) of a 2-hour ULF wave interval. [PDF] Simulations
- Bob Lysak: ULF waves in local MHD model
- Slava Merkin: ULF waves in the LFM.
- Scot Elkington: Mode structure calculations
- 2015 mini-GEM
- 2016 GEM-CEDAR Summer Workshop: Joint session of the ULF wave Modeling, Effects, and Applications (UMEA) and the Modeling Methods and Validation (MMV) Focus Groups, Thu., June 23, 4 PM to 6 PM