Figure Captions:
Figure 1. 9-hr plots from 02:00 to 11:00 UT (Figure 1a) on 5 December 2017, 12:00 to 21:00 UT (Figure 1b) on 5 December 2017, and 21:00 UT on 5 December 2017 to 06:00 UT on 6 December 2017 (Figure 1c) showing multi-instrument observations. Dial plots show the MLT and L shell locations of RBSP A and B (orange and green lines respectively) and Arase (dark blue line). The rainbow color bar shows the mean magnetic spectral density of the chorus waves (between 0.1 and 0.5Fce) observed on RBSP and Arase. The magenta lines represent the observed chorus from ground-based VLF stations. The gray color bar indicates regions where POES observed strong electron precipitation (‘strong’ meaning the measured BLC flux exceeds the threshold profile as described above), and the red stars indicate microburst observations from FIREBIRD and/or AC6-A. The inner and outer black circles in each plot show L shells of 3 and 8 respectively. The gray ovals show the plasmapause location based on the Moldwin et al. [2002] Kp model.
Figure 2. (Figure 1a) MLT vs. UT plot showing observations of chorus (rainbow color bar, representing the mean magnetic spectral density of lower-band chorus observed on RBSP and Arase), magenta lines showing positive detections of chorus from VLF ground stations, microbursts (red stars, representing microbursts observed by FIREBIRD and AC6-A), and strong electron precipitation (purple/orange color bar, representing electron precipitation observed by POES/MetOp). Data is only plotted for regions where there was coverage of both chorus and precipitation. Therefore, the black regions represent areas where there is only coverage of precipitation, or no coverage at all. (Figure 1b) L shell vs. UT plot showing the same observations. (Figure 1c) MLT vs. UT plot showing electron fluxes (rainbow color bar) from MagEIS (RBSP FESA spin-averaged differential electron flux for 183 keV electrons) and HEP (Arase FEDO omni-directional electron flux for 176.7 keV electrons). (Figure 1d) L shell vs. UT plot for electron fluxes.
Figure 3. (Figures 1a, 1c, 1e) Overview of three 9-hr periods of persistent chorus and precipitation observations. Green bars show the microburst/precipitation extent between 4 and 14 MLT. Dark blue bars show the chorus extent. Light blue bars show the chorus coverage from RBSP and Arase. (Figures 1b, 1d, 1f) Upper and lower bounds on the size of the microburst-producing chorus region for the three periods. Gray bars show the lower bounds of the region (i.e. the overlap between chorus and microburst/precipitation observations). Green bars show the upper bounds of the region (i.e. regions where chorus and microburst/precipitation are observed and regions where only microburst/precipitation is observed but no chorus waves due to lack of coverage).