
Case Study:
Solar Wind Electron Moments
This data
set consists of 9789 data points acquired over 1 month (Feb. 80)
from the ISEE3 mission. 11 parameters are available: Date, seconds,
UT time, electron density, bulk flow speed, bulk flow azimuth,
the minimum total temperature, the maximum total temperature,
and angle of maximum temperature, the heat flux, and the heat
flux azimuth. It was obtained in ASCII format via the NSSDC and
converted to XmdvTool format.
High Minimum
Total Temperature
This image shows
a parallel coordinates view of the data, with a brush formed by
dragging over the region with high minimum temperature data. As
can be seen, the majority of this data occurred over a single day,
and has corresponding high values for maximum total temperature.
Statistics
on Individual Parameters
This image shows
a modified Tukey Box Plot for each dimension of the data covered
by the brush. The red circle shows the median value, the red box
shows the outline for the middle 2 quartiles, the red dashed lines
shows the points within 1.5 times the 2575 quartile range of the
median, and red dots indicate outliers. The blue circle shows the
mean value and the blue angle brackets show the standard deviation.
Glyphs of
Data
This display
of each data element as a glyph again shows that most of the values
with high minimum temperature occurred over a block of consecutive
readings.
Matthew
O. Ward (matt@cs.wpi.edu)
