Electrified Postsunrise Ionospheric Perturbations at Millstone Hill

Abstract

As the solar terminator (ST) sweeps through the Earth's atmosphere, sharp gradients in solar illumination across ST and their movement (with both supersonic and subsonic components) can induce disturbances in the atmosphere and ionosphere (Somsikov, 2011). Theoretical calculations and observational studies have focused on ST induced waves, with an emphasis on atmospheric gravity waves (GWs) associated with ST occurring in different layers of the atmosphere (

Traveling Ionospheric Disturbances in the Vicinity of Storm‐Enhanced Density at Midlatitudes

“…The observed MSTIDs for the present study, however, are clearly not concentric. GWs near the terminator have often been observed, for example, Zhang, Erickson, Gasque, et al (2021) identified eastward propagating electrified TIDs during postsunrise hours, and Figure 6 shows MSTIDs near the sunset terminator at 01:30 UT on 2018-08-26 (marked as T4). To provide further contrasts of MSTIDs between storm/substorm and non-storm/substorm conditions, Figure 13 depicts sample non-storm/non-substorm MSTIDs close to the periods of the four storm events studied here.…”

First Observations of Large Scale Traveling Ionospheric Disturbances Using Automated Amateur Radio Receiving Networks

“…Since first reported by Munro (1948), TIDs have been studied using many different techniques. These include ionosondes (e.g., Altadill et al., 2020; Galushko et al., 1998; Galushko et al., 2003), incoherent scatter radars (e.g., Kirchengast et al., 1996; Nicolls & Heinselman, 2007; Thome, 1964; Zhang et al., 2021), HF Doppler radars (e.g., Bristow et al., 1994; Frissell, Baker, et al., 2014; Frissell et al., 2016; Samson et al., 1989; Samson et al., 1990), broadcast AM Doppler receivers (Chilcote et al., 2015), global navigation satellite system (GNSS) total electron content (TEC) receivers (e.g., Dinsmore et al., 2021; Tsugawa et al., 2007; Zakharenkova et al., 2016), and airglow imagers (e.g., Mendillo et al., 1997; Otsuka et al., 2004; Ogawa et al., 2009). Each of these different techniques provides a unique and complementary view into understanding the nature of TIDs.…”

Conjugate Effect of the 2011 Tohoku Reflected Tsunami‐Driven Gravity Waves in the Ionosphere

“…Recently, Zhang et al. (2021) reported that the midlatitude dawn solar terminator‐excited gravity waves in the ionosphere are electrified TIDs. They suggested that the polarization electric field perturbations were embedded in TIDs though the incoherent scatter radar ion drift observations.…”