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To measure the characteristics of the ionosphere along the sferic propagation paths , broadband VLF magnetic field observations are compared to results from the same ELF / VLF propagation model which has been adapted to simulate the broadband signals considered in this work . At the MPB the magnetic field increases by an order of magnitude . In his nomination , the Condensed Matter Unit at APS recognized Singleton " for elucidation of many-body and reduced-dimensionality effects in molecular organic crystals and semiconductor systems , featuring creative use of optical and magnetic field techniques and clear technical exposition . The model achieves MeV energies by using the highly turbulent interplanetary magnetic field data . " It presents , in a useful form , the magnetic field data for a period of 2 days , including 41 hours before and 7 hours after the closest approach to Venus , which occurred at 1702 UT on February 5 , 1974 . This data set consists of 16-mm microfilm which contains 1 hour of 1.2-s average vector magnetic field data plots per frame ( 30 min across the frame , twice ) . The superconducting circuits could eventually be used in highly-sensitive magnetic field sensors and as logic circuits for quantum computers .