Abstract
A cusp formation on topside ionograms recorded at equatorial latitudes by means of the satellite Alouette I, has been discussed by earlier workers1, 2. The cusps are associated with an ionisation ledge lying along the magnetic field line passing through the peaks of the equatorial anomaly.
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References
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RAGHAVARAO, R., SIVARAMAN, M. Ionisation ledges in the equatorial ionosphere. Nature 249, 331–332 (1974). https://doi.org/10.1038/249331a0
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DOI: https://doi.org/10.1038/249331a0
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