The Effect of Sudden Ionospheric Disturbances (S.I.D.'s) on 2·28 Mc/s Pulse Reflections from the Lower Ionosphere
Open Access
- 1 January 1959
- journal article
- research article
- Published by CSIRO Publishing in Australian Journal of Physics
- Vol. 12 (1) , 42-53
- https://doi.org/10.1071/ph590042
Abstract
The effects of sudden ionospheric disturbances (S.LD.'s) on the complicated structure ()f ionospheric echoes obtained with moderately high sensitivity at 2�28 Mcls are described. The observations indicate that flares of classes 2 and 3 can produce high values of electron density near the base of the ionosphere. Mean electron density can exceed 1000/cm3 over the height range 60-75 km, where the greatest relative increase in ionization occurs. Nevertheless, the greater part of the S.LD. absorption of waves reflected from the E region or above still occurs above 85 km.Keywords
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