Abstract
The National Geomagnetic Information Center (NGIC) of the U.S. Geological Survey recently produced a pair of CD‐ROMs, using the ISO 9660 standard, that contain 1‐minute values of the Earth's magnetic field from the USGS network of thirteen magnetic observatories.One CD‐ROM contains data for the years 1985–1989, and the other contains 1990 data. A third CD‐ROM containing 1991 data is expected to be available soon. One‐year CDROMs will be produced annually until 5 years of data have been accumulated, at which time a separate CD‐ROM containing these 5 years of data will also be produced. Digital geomagnetic data for some of these USGS observatories extends back into the mid‐1970's and are currently being processed for distribution on CD‐ROMs as well. Figure 1 shows the locations of the U.S.magnetic observatories.
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