Evidence for simultaneous occurrence of periodic and single dark band MSTIDs over geomagnetic low-mid latitude transition region

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

“…In all the cases, the polarization electric field within the MSTIDs' fronts played a role in the interaction process. Of late, simultaneous existence of two different MSTIDs has been reported from the same location of Hanle (Rathi et al., 2021; Yadav, Rathi, Sarkhel, et al., 2021), but in these cases, there was no interaction between these coexisting MSTIDs. Wu et al.…”

“…In all the cases, the polarization electric field within the MSTIDs' fronts played a role in the interaction process. Of late, simultaneous existence of two different MSTIDs has been reported from the same location of Hanle (Rathi et al, 2021;, but in these cases, there was no interaction between these coexisting MSTIDs. Wu et al (2021) reported an interaction between two oppositely traveling MSTIDs, in which the MSTIDs got merged and disappeared later.…”

“…MSTIDs have been studied for the last few decades using different data sets viz 630.0 nm airglow imager data, GPS TEC data, and ionosonde data. Using 630.0 nm airglow imager data, it is observed that MSTIDs can occur as multiple bright and dark bands as well as a single dark band (Figueiredo et al, 2018;Paulino et al, 2016Paulino et al, , 2018Pimenta, Kelley, et al, 2008, Pimenta, Amorim, et al, 2008Rathi et al, 2021). The event on the night of 21 May 2020 comprised of multiple dark and bright fronts, which were NW to SE aligned and propagated southwestward (Figure 1).…”

“…Rathi et al. (2021) found simultaneous coexistence of periodic and single dark band MSTIDs. Yadav, Rathi, Gaur, et al.…”

Evidence for the In‐Situ Generation of Plasma Depletion Structures Over the Transition Region of Geomagnetic Low‐Mid Latitude

“…Two distinct kinds of electric field fluctuations are observed in the mid‐latitude ionosphere such as, electric field fluctuations associated with (a) Nighttime medium scale traveling ionospheric disturbances (MSTIDs) that mostly appears at the conjugate points of the ionosphere (Saito et al., 1995) simultaneously, (b) Mid‐latitude F‐region field aligned irregularities (FAIs) observed by the incoherent scatter radar (Fukao et al., 1991; Otsuka et al., 2009). MSTIDs propagate toward southwest with northwest to southeast phase front alignment (Narayanan et al., 2014; Rathi et al., 2021 and reference therein). On the other hand, FAI drifts westward (Fukao et al., 1991; Hysell et al., 2016, 2018) and plasma moves upward inside FAI structures.…”