Rastogi, R. G.Fejer, B. G.Woodman Pollitt, Ronald Francisco2018-07-042018-07-041977-01Rastogi, R. G., Fejer, B. G., & Woodman, R. F. (1977). Sudden disappearance of vhf radar echoes from equatorial e-region irregularities.==$Indian Journal of Radio & Space Physics, 6,$==39-43.http://hdl.handle.net/20.500.12816/1669The Modified Range Time lntensity Technique for studying the height variation of the (back-scatter power of vhf radar echoes at Jicamarca has been used to show that the growth lime of E-region irregularities is less than 1 min. Further, these irregularities disappear or reappear precisely at the time when AH at an equatorial minus AH at a non-equatorial station is close to zero irrespective of absolute H over the dip equator. This is consistent with the idea that E-region irregularities over the dip equator scattering the hf or vhf radio waves are due to gradient drift instability and supports the double-current hypo1hcsis for the equatorial electrojet.application/pdfenginfo:eu-repo/semantics/restrictedAccessEchoesIonosphereIncoherent Scattering RadarE Regioninfo:eu-repo/semantics/articlehttp://purl.org/pe-repo/ocde/ford#1.05.01Indian Journal of Radio & Space Physics