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.