VHF scintillation associated with equatorial plasma bubbles over low latitude Indian region: a case study

Abstract

The nightglow observations of OI 630.0 nm emission carried out from low latitude station Kolhapur using All Sky Imager (ASI) with 140° field of view (FOV) for the month of April 2011 are used. The images were processed to study the field aligned irregularities often called as equatorial plasma bubbles (EPBs). The present study focuses on the occurrence of scintillation during the traversal of EPBs over ionospheric pierce point (IPP). Here we dealt with the depletion level (depth) of the EPB structures and itseffect on VHF signals. We compared VHF scintillation data with airglow intensities at Ionospheric pierce point (IPP)from the same location. The determination of IPP can be done by drawing its geometry as shown in Figure 1.