Vegi AR, Challa J, M. B S. Long Term Variations of Ionospheric Horizontal Drift and Anisotropy of E-region Irregularities at Waltair. ASRJETS-Journal. 2017;36(1):184-197. Accessed September 16, 2025. https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/3384