NASA NTRS ยท 19690043714
A regular disturbance in the topside ionosphere.
Abstract
Regular disturbance in topside ionosphere on summer nights from continuous records of ionospheric electron content, discussing magnetic activity and sunspot number effects
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Titheridge, J. E.. 1969-03-01. A regular disturbance in the topside ionosphere.. https://ntrs.nasa.gov/citations/19690043714
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