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).