Genesis interplanetary field orientation proxy

The vector direction of peak suprathermal electron flux as measured with the Genesis Electron Monitor (GEM) instrument. This direction serves as a proxy for the interplanetary field orientation. The suprathermal electron flux is either parallel or anti-parallel to the interplanetary magnetic field. The true field polarity (+ or -) cannot be determined from GEM. Angles are given in Geocentric Solar Ecliptic (GSE) coordinates.