Abstract
It has been noted by D. K. Bailey, R. Bateman, and R. C. Kirby1 that sudden ionospheric disturbances on the earth associated with flares (chromospheric eruptions) on the sun are in turn associated with enhanced signal strengths on ionospheric scatter circuits operating at 50 Mc. An SID is a phenomenon which occurs only on the daylight portion of the earth and, therefore, SID-type enhancements of VHF signal strengths are found to occur generally during daylight hours. The records of signal strengths observed at Sterling, Virginia, of transmissions on 49.8 Mc at Cedar Rapids, Iowa, showed an SID-type occurrence during the night-time hours of February 22–23, 1956. This occurrence was in close time association with the flare seen at Tokyo and Kodaikanal, and cosmic-ray outburst reported from many locations, including the Chicago area by P. Meyer, E. N. Parker, and J. A. Simpson.2 The VHF signal strength reached a maximum at 0413 UT.
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