A Case Study on the Interaction Between MSTIDs' Fronts, Their Dissipation, and a Curious Case of MSTID's Rotation Over Geomagnetic Low‐Mid Latitude Transition Region

Abstract

Medium scale traveling ionospheric disturbances (MSTIDs) are propagating plasma depleted and rich bands in the midlatitude ionospheric F region. In the northern hemisphere, nighttime MSTIDs are generally oriented from northwest (NW) to southeast (SE) and propagate in southwest (SW) direction with phase velocities ranging from 50 to a few hundred m/s (Ding et al.

A Rare Simultaneous Detection of a Mid‐Latitude Plasma Depleted Structure in O(1D) 630.0 and O(1S) 557.7 nm All‐Sky Airglow Images on a Geomagnetically Quiet Night

“…During 5 years of airglow observations from a mid-latitude station, Hanle (32.7°N, 78.9°E; Mlat. 24.1°N), Ladakh, India, different types of plasma structures, viz., electrified and non-electrified medium-scale traveling ionospheric disturbances (MSTIDs), mid-latitude spread-F (MSF), and mid-latitude field-aligned plasma depletion, have been observed in 630.0 nm images (Patgiri, Rathi, Yadav, Sarkhel, et al, 2024;Rathi et al, 2021Rathi et al, , 2022Rathi et al, , 2024Sivakandan et al, 2020Sivakandan et al, , 2021Yadav, Rathi, Gaur, et al, 2021).…”

“…During 5 years of airglow observations from a mid‐latitude station, Hanle (32.7°N, 78.9°E; Mlat. 24.1°N), Ladakh, India, different types of plasma structures, viz., electrified and non‐electrified medium‐scale traveling ionospheric disturbances (MSTIDs), mid‐latitude spread‐F (MSF), and mid‐latitude field‐aligned plasma depletion, have been observed in 630.0 nm images (Patgiri, Rathi, Yadav, Sarkhel, et al., 2024; Rathi et al., 2021, 2022, 2024; Sivakandan et al., 2020, 2021; Yadav, Rathi, Sarkhel, et al., 2021; Yadav, Rathi, Gaur, et al., 2021). The present study reports a first of its kind event in which the same plasma‐depleted structure was observed both in 630.0 and 557.7 nm images on a geomagnetically quiet night (Ap = 3) on 26 June of low solar active year 2021.…”