Dayside EMMA-RBSP conjunctions during variable geomagnetic conditions

This data set contains a list of simultaneous observations of electron number density and plasma mass density at the magnetic equator, during variable geomagnetic conditions. The equatorial electron number density is obtained by re-scaling Van Allen Probes (RBSP) observations using a dipole field approximation to describe the portion of the field line from the satellite to the equatorial crossing point and assuming a decay rate of r−1. Original electron density data set is determined using the Neural-network-based Upper-hybrid Resonance Determination (NURD) algorithm (Zhelavskaya et al., 2016) and is available at https://doi.org/10.5880/GFZ.2.8.2020.002. The equatorial plasma mass density is inferred from field line resonances estimated by magnetic signal detected at the European quasi-Meridional Magnetometer Array (EMMA). The original geomagnetic field data are available from https://zenodo.org/record/3387216, and detailed information on the method used to infer the plasma mass density is described by Del Corpo et al. (2019). The analysis is limited to daytime hours and to the periods: 2012/09/22-2012/12/01 2013/03/13-2013/03/27 2013/05/25-2013/06/11 2014/02/14-2014/03/09 2015/03/13-2015/03/31 2015/06/18-2015/06/27 2017/05/26-2017/06/02 A conjunction between the plasma mass density measure and the electron number density measure is identified when they differ in UT by at most 1 h and refer to positions that differ at most by ∆r/r = 0.05 and ∆MLT = 0.5 h, where r is the geocentric distance, and MLT is the magnetic local time. Besides the densities values and their uncertainties, the data set contains date in universal time, magnetic local time and radial distance of both measures, as well as a label to identify the probe (A or B) and a flag indicating if the conjunction refers to the plasmasphere or the plasmatrough region.