Dayside EMMA-RBSP conjunctions during variable geomagnetic conditions

This data set contains a list of simultaneous observations of electron number density and plasma <br> 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 <br> using a dipole field approximation to describe the portion of the field line from the satellite to the<br> equatorial crossing point and assuming a decay rate of <em>r</em>⁻¹. Original electron density data set is <br> determined using the Neural-network-based Upper-hybrid Resonance Determination (NURD) algorithm <br> (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 <br> detected at the European quasi-Meridional Magnetometer Array (EMMA). The original geomagnetic field data <br> are available from https://zenodo.org/record/3387216, and detailed information on the method used to infer<br> 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 <br> identified when they differ in UT by at most 1 h and refer to positions that differ at most by <br> ∆<em>r</em>/<em>r</em> = 0.05 and ∆MLT = 0.5 h, where <em>r</em> 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, <br> magnetic local time and radial distance of both measures, as well as a label to identify the probe <br> (A or B) and a flag indicating if the conjunction refers to the plasmasphere or the plasmatrough region.