Automated MMS Burst-mode Bow Shock Locations and Normals

This file contains the time and location of bow shock crossings seen in all four MMS probes over 8 years of dayside observations determined with three methods (sigmoid fitting, cross-correlation, and a statistical model. The statistical model is from Yeakel et al. (doi: 10.22541/essoar.174241659.95442361/v1) and the automated sigmoid fitting and cross-correlation are described in Toy-Edens et al.’s Automated Bow Shock Identification and Multi-Spacecraft Timing using Magnetospheric Multiscale (MMS) Observations (in prep). If you use any parts of the dataset, please cite Toy-Edens et al.’s Automated Bow Shock Identification and Multi-Spacecraft Timing using Magnetospheric Multiscale (MMS) Observations (DOI: 10.1029/2025JA034252). This work was funded by grant 2225463 from the NSF GEM program. The following tables detail the contents of the “bow_shock_normals_3methods.csv” file: Column Name Description sigmoid_bow_shock_time_mms{probe} Epoch of bow shock ramp for MMS{probe} (1,2,3,4) using the automated sigmoid method (see paper for more details) sigmoid_r_{x/y/z}_gse_mms{probe} {x/y/z} position in GSE of MMS{probe} (1,2,3,4) for the bow shock ramp epoch determined with the automated sigmoid method sigmoid_r_{x/y/z}_gse_mms{probe}_prime Same as “sigmoid_r_{x/y/z}_gse_mms{probe}” except the position is corrected for aberration in GSE (see paper for more details) sigmoid_n_{x/y/z}_mean The average bow shock normal component in {x/y/z} using multi spacecraft timing methods on the epochs and locations of the bow shocks determined with the automated sigmoid method sigmoid_n_{x/y/z}_mean The standard deviation of bow shock normal component in {x/y/z} using multi spacecraft timing methods on the epochs and locations of the bow shocks determined with the automated sigmoid method model_norm_{x/y/z} The model bow shock boundary or normal in {x/y/z} from Yeakel et al. (DOI: 10.22541/essoar.174241659.95442361/v1) for 45 degree IMF. Corrected for aberration (see paper for details) cross_corr_bow_shock_time_mms{probe} Epoch of bow shock ramp for MMS{probe} (1,2,3,4) using the automated cross-correlation method (see paper for more details) cross_corr _r_{x/y/z}_gse_mms{probe} {x/y/z} position in GSE of MMS{probe} (1,2,3,4) for the bow shock ramp epoch determined with the automated cross-correlation method cross_corr_r_{x/y/z}_gse_mms{probe}_prime Same as “cross_corr_r_{x/y/z}_gse_mms{probe}” except the position is corrected for aberration in GSE (see paper for more details) cross_corr _n_{x/y/z}_mean The average bow shock normal component in {x/y/z} using multi spacecraft timing methods on the epochs and locations of the bow shocks determined with the automated cross-correlation method cross_corr _n_{x/y/z}_mean The standard deviation of bow shock normal component in {x/y/z} using multi spacecraft timing methods on the epochs and locations of the bow shocks determined with the automated cross-correlation method transition Transition names (quasi-perpendicular bow shock, quasi-perpendicular bow shock) determined from Toy-Edens et al. 2024 (DOI:10.1029/2024JA032431). b{x/y/z}_upstream Upstream magnetic field component {x/y/z}. See paper for more details. theta_{sigmoid/cross/model}_{sigmoid/cross/model} The angle in degrees between bow shock normals determined by three methods {sigmoid/cross/model} to the other methods besides themselves theta_imf_{sigmoid/cross/model} The angle in degrees between bow shock normals determined by three methods {sigmoid/cross/model} to the upstream magnetic field vector (i.e. theta BN for different methods) theta_imf_{sigmoid/cross/model}_max90 Same as “theta_imf_{sigmoid/cross/model}” except if the value is greater than 90 degrees we take the supplementary angle.