References
- BAILEY, D. K., 5957. Disturbances in the lower iono-sphere observed at VHF following the solar flare of 23 February 1956 with particular reference to auroral-zone absorption. J. Geophys. Res. 62 pp. 435–63.
- CHAPMAN, S., and LITTLE, C. G., 1957. The non-deviative absorption of high-frequency radio waves in auroral latitudes. J. At m. Terr. Phys. xo pp. 20–35.
- ECKERSLEY, T. L., 1942. Holes in the ionosphere and magnetic storms. Nature 150 p. 577.
- HULTQVIST, B., 1959.: On the interpretation of ioniza-tion in the lower ionosphere occurring on both day and night side of the earth within a few hours after some solar flares. Tellus, II pp. 332–343.
- HUITQVIST, B., 1959.: On lower ionosphere electron detachment- and recombination coefficients obtained from measurements of non-deviative ionospheric absorption. Arkiv for Geofysik, 3 pp. 97–110.
- LIED, F., 5957. Ionospheric absorption observed on the 23rd February 1956 at Kjeller and Tromsii. J. Atm. Terr. Phys. 19 p. 48.
- LINDQUIST, R., 1949. The panoramic ionospheric record-er. Tellus t pp. 37–43.
- LITTLE, C. G., and LEINBACH, E., 1958. Some measure-ments of high-latitude ionospheric absorption using extraterrestrial radio waves. Proc. IRE 46 pp. 334–348.
- MEREDITH, L. H., Gomms, M. B., and VANAmax, J. A., 1955: Direct detection of soft radiation above 50 kilometers in the auroral zone. Phys. Rev. 9.7 pp. 201–205.
- MITRA, S. K., 1952. The upper atmosphere. The Asiatic Society, Calcutta.
- RAWER, K., 5953. Die Ionosphiire. P. Nordhoff N.V., Groningen—Holland, pp. 189.
- SHAPLEY, A. H., and ROBERTS, W. O., 5957. The great solar regions of 9-24 February 1956 and their terrestrial effects. National Bureau of Standards, Report 5062.
- WILD, J. P., ROBERTS, J. A., MURRAY, J. D., 1954: Radio evidence of the ejection of very fast particles from the sun. Nature 173 pp. 532–34.