STEREO and near-Earth multi-spacecraft observations of solar energetic particle (SEP) events have revealed that some events show quite unexpected intensity distributions at 1 AU (Dresing et al. 2012, Lario et al. 2013). They can be much broader (circumsolar) (Gómez-Herrero et al. 2015), non-symmetric, and sometimes irregular showing so-called finger distribution (Klassen et al. 2016). It had been suggested that these non-symmetric and irregular distributions, among others, may result from non-radial particle injection and propagation in the solar corona below the solar wind source surface.
In this nugget we present an SEP event which indeed shows a clear evidence for such strongly non-radial electron injection and propagation in the solar corona. The detected electron event was associated with a giant coronal jet observed in extreme ultraviolet (EUV) appearing at the border of an isolated equatorial coronal hole (CH). At that time the angular separation between the flare and magnetic footpoints connecting the Sun to STA and STB was 68° and 90°, respectively.
Fig. 1 presents a series of 13, mostly impulsive electron events detected by the Solar Electron and Proton Telescope (SEPT) at STEREO-A (STA, red) and STEREO-B (STB, blue) between 17 and 22 July 2014.
Figure 1. Overview of ...