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It is pointed out that radiocarbon is produced in the earth's atmosphere by the nuclear reaction N-14(n,p)C-14. The photosynthesis by trees of carbon in the form of CO2 provides an estimate of the C-14/C-12 ratio and, therefore, the atmospheric inventory of C-14 at the time of take-up. The existence of periodicities in the radiocarbon record has been considered by Suess (1965, 1971, 1980). The present investigation is concerned with these periodicities. Periodicities in the radiocarbon record are related to variability in the modulation of the galactic component of the incoming cosmic ray flux, mediated by the oceanic and atmospheric reservoirs. The long periods observed are an indicator of corresponding changes in the hydromagnetic output of the sun, which might be caused by changes in the intensity of the magnetic field escaping from the solar atmosphere.

Distant geomagnetic tail longitudinal magnetic field gradient model based on pressure balance between internal field and solar wind, discussing tail flux content

Pressure conditions across distant magnetopause from interplanetary magnetic field measurements, comparing Pioneer 7 plasma data with Explorer 33 distant geomagnetic tail field magnitudes

Solar-magnetospheric neutral sheet reconnection and noise in geomagnetic tail from Explorer 33 Ames magnetometer

Apollo 12 magnetometer data and selenomagnetic field determinations

Secular change examination in cislunar geomagnetic tail field gradient during summers of 1966 and 1967, using Explorer 33 and 35 results

Geomagnetic tail configuration and reconnection data from Explorer 33 satellite, noting skewing of field lines

Geomagnetic tail topology, reconnection and interaction with moon from Explorer 33 satellite data

Spacecraft rotation effect on measurement of hydromagnetic radiation in solar wind

Correction of magnetic measurements made by Mariner II, noting use of second-order approximation for interplanetary magnetic field

Worldwide positive-negative impulse pair observed on geomagnetic records found to be recurrent and associated with M-region disturbances

Spacecraft rotation effect on measurement of hydromagnetic radiation in solar wind