Articles | Volume 38, issue 2
Ann. Geophys., 38, 575–590, 2020
Ann. Geophys., 38, 575–590, 2020

Regular paper 24 Apr 2020

Regular paper | 24 Apr 2020

Plasma density gradients at the edge of polar ionospheric holes: the absence of phase scintillation

Luke A. Jenner et al.

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Cited articles

Aarons, J.: Global Morphology of Ionospheric Scintillations, Proc. IEEE, 70, 4, 360–378,, 1982. 
Alfonsi, L., Spogli, L., De Franceschi, G., Romano, V., Aquino, M., Dodson, A., and Mitchell, C. N.: Bipolar climatology of GPS ionospheric scintillation at solar minimum, Radio Sci., 46, RS0D05,, 2011. 
Anderson, D. N., Buchau, J., and Heelis, R. A.: Origin of density enhancements in the winter polar cap ionosphere, Radio Sci., 23, 513–519,, 1988. 
Benson, R. and Grebowsky, J.: Extremely low ionospheric peak altitudes In the polar hole region, Radio Sci., 36, 277–285,, 2001. 
Briggs, B. H. and Parkin, I. A.: On the variation of radio star and satellite scintillation with zenith angle, J. Amos. Terr. Phys., 25, 339–365,, 1963. 
Short summary
The boundary of regions with a plasma density much lower than background was investigated in the northern polar cap using observations of ionospheric plasma density. Similar regions with an above-background density have been linked to fluctuations in phase and amplitude in radio waves traversing the density gradient at their boundary. These fluctuations were absent through the gradient in the below-background regions; thus, a minimum of both density and gradient are required for scintillation.