Measurements of Columnar Ice Crystal Dimensional Time Series at 
Temperatures below -40C
Gwenore Pokrifka*, Alfred Moyle, and Jerry Y. Harrington
Department of Meteorology and Atmospheric Science, 
The Pennsylvania State University, University Park, PA
*Current affiliation: High Meadows Environmental Institute, 
Princeton University, Princeton, NJ

These data were collected with the Substrate Crystal Imaging (SCI) 
thermal-gradient diffusion chamber (Pokrifka et al., in prep.). Crystals 
were grown from a fiberglass substrate at temperatures below -40 and 
mid- to high-supersaturation. Two type-T thermocouples were used to 
track the conditions within the chamber, and two K2 DistaMax long-range 
microscopes, placed orthoganally to each other, were used to capture 
images of growing crystals at regular intervals. The views in 'Camera 1' 
and 'Camera 2' are, respectively, orthoganal and parallel to the 
substrate. The angle of each crystal from horizontal has been used to 
correct the projection measurements.

'conditions.dat' contains information on the environmental conditions of 
each experiment. Each column is as follows:

0) experiment name
1) temperature (C)
2) ice supersaturation (%)
3) supersaturation ratio
4) crystal angle in Camera 1 (rad)
5) crystal angle in Camera 2 (rad).


The remaining files are the time series for each experiment. The file 
name corresponds to the experiment name in 'conditions.dat'. The columns 
in 'X-timeseries.dat' are

0) elapsed time (s)
1) Camera 1 minor dimension projection(px)
2) Camera 1 major dimension projection( (px)
3) Camera 1 minor semi-dimension (um)
4) Camera 1 major semi-dimension (um)
5) Camera 2 minor dimension projection( (px)
6) Camera 2 major dimension projection( (px)
7) Camera 2 minor semi-dimension (um)
8) Camera 2 major semi-dimension (um).