Japan Geoscience Union Meeting 2019

Presentation information

[E] Oral

P (Space and Planetary Sciences ) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM13] Inner magnetosphere: Recent understanding and new insights

Tue. May 28, 2019 1:45 PM - 3:15 PM A04 (TOKYO BAY MAKUHARI HALL)

convener:Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Danny Summers(Memorial University of Newfoundland), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Shinji Saito(Graduate School of Science, Nagoya University), Chairperson:Danny Summers, Yoshizumi Miyoshi(ISEE, Nagoya University)

2:25 PM - 2:40 PM

[PEM13-03] Optimal Use of Time Lags Between MMS Spacecraft : Application to the Estimation of Wave-Vectors

*Gerard Marcel CHANTEUR1,2,3, Drew L. Turner, Olivier Le Contel1,2,3, Alessandro Retino1,2,3, Laurent Mirioni1,2,3 (1.CNRS, 2.SORBONNE UNIVERSITE, 3.ECOLE POLYTECHNIQUE)

Keywords:multi-spacecraft missions, MMS, field analysis, wave vectors, phase shifts

Turner et al. (2017) made use of cross-correlations of SCM quasi monochromatic data between pairs of MMS spacecraft to estimate phase lags and to derive wave vectors of whistler mode chorus elements in the inner magnetosphere. A new approach has been developped to revisite this study. For a cluster of four spacecraft there are six pairs of spacecraft, each one giving raise to a scalar equation relating the vector position R from the first to the second spacecraft, the wave vector K and the phase lag Δφ : R.K=Δφ. A positive weight is attributed to each equation (wj, j=1 to 6). A statistical ensemble of 6-uplets is built and we look for the 6-uplet giving the lowest condition number of matrix M. This procedure warrants the best accuracy of the pseudo-inverse of M and hence the best estimate of the wave vector K. Adding random perturbations to M and Δφ the procedure allows to estimate the uncertainties on K.

Turner, D. L. et al. JGR Space Physics, https://doi.org/10.1002/2017JA024474