Reconstructed IMF Properties from MEX Heavy Pickup Ion Measurements

Dataset: IMF information derived from heavy pickup ions (HPUI) measurements by Mars Express (MEX) Ion Mass Analyzer (IMA). Aug 2014 - Sep 2022. Columns: HPUI detecting time MEX orbit number MEX IMA Scan number fx, fy, fz: normalized HPUI flux directions in MSO measured by MEX IMA HPUI energy measured by MEX IMA MSO-x, MSO-y, MSO-z: MEX spacecraft positions in MSO MEX nsw, MEX Vsw: MEX measruements of the solar wind density and velocity Clock angle: derived IMF clock angle from HPUI measurements B_perp: strenghth of the IMF component perpendicular to solar wind derived from HPUI measurements Notes: For more detials, see Dong, Y., Ramstad, R., Davis, M. W., Holmström, M., Brain, D. A., Espley, J. R., & Curry, S. M. (2025). Deriving IMF properties from Mars Express heavy pickup ion measurements. Geophysical Research Letters, 52, e2025GL114745. https://doi.org/10.1029/2025GL114745 The IMF components By = cos(phi) & Bz = sin(phi) in the Mars-Solar Orbital (MSO) coordinate system. Phi is the IMF clock angle. Bx cannot be obtained from this method. See Dong et al. 2025 for the uncertainties of this proxy.