The digital charts encode magnetic-field polarity and coronal hole polarity with four distinctive gray levels. Each pixel represents one square heliographic degree. These displays show long lifetimes to large-scale features and reveal proper motions, evolutions and rotation rates with clarity. Data are available on 3 inch or 5 inch IBM-compatible diskettes. Diskette contains data description and comprehensive tables of rotation numbers, start and end times, and data availability dates.
Data are in numeric format.
For non-programmers we can also supply TIFF, PCX, or GIF ect., plotted files. Click for ordering information .