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Derivation of International Geomagnetic Reference Field with tables of spherical harmonic coefficients and test results of various magnetic field models

Derivation and tables of spherical harmonic coefficients and isoporic charts for International Geomagnetic Reference Field for 1965

Provisional hourly values of equatorial Dst for 1968

The worldwide coverage of the earth by land, sea, and aircraft magnetic surveys since the beginning of the 20th century is shown on three world maps for surface surveys spanning the periods of 1900-1930, 1930-1955, and 1955-1967, respectively, on a fourth map for ship-towed magnetometer surveys performed after 1956, and on a fifth map for 1953-1966 airborne survey data. The technique used, involving a position plotting of each measurement with a microfilm plotter, results in the appearance of heavily surveyed regions as completely darkened areas. The coverage includes measurements at about 100,000 land stations, airborne measurements at over 90,000 points, and marine measurements at over 25,000 points. The marine measurements cover over 1,000,000 km of trackline.

Solar limb photographic, isodensity and isophotal data for eclipse of 7 March 1970 from coronagraph observations, noting coronal green line and prominence activity

Hourly values of equatorial storm time variation as function of solar wind pressure on boundary of magnetosphere

Observatory calculations of hourly values of equatorial Dst for 1968

Provisional hourly values of equatorial Dst for 1964, 1965, 1966, and 1967 - tables

Derivation of international geomagnetic reference field