IONIZATION GROWTH AT SUNRISE IN THE E-F REGION OF THE IONOSPHERE.
Scientific rept. no. 2,
UNIVERSITY OF NEW ENGLAND ARMIDALE (AUSTRALIA)
Pagination or Media Count:
Ionograms, recorded near sunrise using a Cossor ionosonde with an array of 40 dipoles for 1.515 Mcs, the gyro-frequency in the lower E-region, show increased group retardation of extraordinary F-echoes at frequencies near 2 Mcs commencing when the suns zenith angle is between 96 degrees and 98 degrees. This is followed by the appearance of stratifications in the E-F region. There is good agreement in the sunrise period between the observed ionization growth and that calculated for the solar radiations 911-1027 A and 10-170 A, which produce their maximum photoionization of O2 during the day at the peak of the E-region. Author