Predicted times of bow Shock crossings at Venus from the ESA/Venus Express mission, using spacecraft ephemerides and magnetic field data, with a predictor-corrector algorithm

• Main Authors: Simon Wedlund, Cyril, Volwerk, Martin, Persson, Moa, Bergman, Sofia, Signoles, Claire
• Format: Other/Unknown Material
• Language: English
• Published: Zenodo 2023
• Subjects: Bow shock; Venus; Venus Express; North Pole
• Online Access: https://doi.org/10.5281/zenodo.7650328

CHARACTERISTICS Planet: Venus Radius: R V = 6051.8 km (volumetric mean planetary radius) Spacecraft: ESA/Venus Express Spacecraft coordinates system: Venus Solar Orbital (VSO) equivalent to Sun-State coordinate system: + X VSO points towards the Sun from the planet’s centre, + Z VSO towards Venus’ North pole and perpendicular to the orbital plane defined as the X VSO – Y VSO plane passing through the centre of Venus, Y VSO completes the orthogonal system. Time span: 01/04/2006 to 25/11/2014 Total number N of candidate bow shock crossings in the database: N = 4950 Number of quasi-parallel bow shock crossings: N || = 844 Number of quasi-perpendicular bow shock crossings: N \(\perp\) = 4106 ORIGINAL DATASETS USED The original Venus Express/MAG data repository on which these algorithmswere applied is available on ESA's Planetary Science Archive system (PSA) at: https://archives.esac.esa.int/psa/ftp/VENUS-EXPRESS/MAG/.For this study, 1-Hz magnetic field data was used. METHOD To construct this database from the original datasets above, thepredictor and predictor-corrector algorithms used are described for the Mars case in: Simon Wedlund, C., Volwerk, M., Beth, A., Mazelle, C.,Möstl, C., Halekas, J., Gruesbeck, J. and Rojas-Castillo, D.,(2021), A Fast Bow Shock Location Predictor-Estimator From 2Dand 3D Analytical Models: Application to Mars and the MAVENmission, Journal of Geophysical Research , 127 , e2021JA029942. https://doi.org/10.1029/2021JA029942 They consist of two consecutive steps: Predictor geometric algorithm based on 2D or 3D existing fits for prediction of the Venus bow shockposition. The original fits were taken from 2D conic fits in the plane \(\left(X_\text{VSO}, \sqrt{Y_\text{VSO}^2+Z_\text{VSO}^2}\right)\) performed on the datasets of Persson et al. (2023) , Venusian bow shock crossings manually identified from measurements by the ASPERA-4 and MAG instruments onboard Venus Express, Zenodo ( https://doi.org/10.5281/zenodo.7679677 ). Corrector algorithm based on magnetic field measurements. We also ...