First Observations of <i>E</i>‐Region Near Range Echoes Partially Modulated by <i>F</i>‐Region Traveling Ionospheric Disturbances Observed by the Same SuperDARN HF Radar

HIYADUTUJE, Alicreance; Kosch, M. J.; Stephenson, J. A. E.

doi:10.1029/2021ja030157

Cited by 3 publications

(26 citation statements)

References 82 publications

(201 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The long-term statistical study shows that the mean and standard deviation of the Spearman correlation coefficient values is 0 and 0.3, respectively indicating that the positive and negative Spearman correlation coefficient values where MSTIDs partially affected NREs, that is, by ∼9%, are almost equal. These values agree well with the previous studies (Hiyadutuje et al, 2022;Otsuka et al, 2007Otsuka et al, , 2009.…”

Section: Discussionsupporting

confidence: 94%

“…To maintain divergence-free current continuity for the Pedersen current J in F-region, a periodic horizontal polarization electric field (E pF = [δΣ p /Σ p ] (E + U × B)[k/|k|]) takes place within the MSTID wave. Figure 7 of Hiyadutuje et al (2022) shows the polarization electric field generated by a passing MSTID wave. The Pedersen current is given by J = Σ p (E + U × B), where Σ p is the F-region Pedersen conductance, E is the electric field, U is the neutral wind and B is the magnetic field (Haldoupis et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…Figure 7 of Hiyadutuje et al. (2022) shows the polarization electric field generated by a passing MSTID wave. The Pedersen current is given by J = Σ p ( E + U × B ), where Σ p is the F ‐region Pedersen conductance, E is the electric field, U is the neutral wind and B is the magnetic field (Haldoupis et al., 2003).…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Simultaneous Occurrence of Traveling Ionospheric Disturbances, Farley Buneman and Gradient Drift Instabilities Observed by the Zhongshan SuperDARN HF Radar

Hiyadutuje,

Habarulema,

Kosch

et al. 2024

JGR Space Physics

Self Cite

View full text Add to dashboard Cite

We show that Traveling Ionospheric Disturbances (TIDs) may affect the Farley Buneman Instability (FBI) and Gradient Drift Instability (GDI) echoes referred to as the Near Range Echoes (NREs) in the SuperDARN radar backscatter from the lower part of the E‐region. TIDs and NREs are observed concomitantly by the Zhongshan SuperDARN radar (69.38°S, 76.38°E) in the far and near ranges, respectively. At the moment, there is no study about the effects of TIDs on the NREs caused by the FBI using the SuperDARN radars. The GDI are more likely to occur at a lower altitude while FBI occurs at a slightly higher altitude in the lower part of the ionospheric E‐region. We use the Spearman Correlation Coefficient (SCC) to show that a part of the NREs backscatter power could be statistically explained by the MSTIDs backscatter power received by the same radar. We also investigate the simultaneous occurrence rate of the NREs and MSTIDs during the 24th solar cycle. Seasonal variability shows that MSTIDs‐NREs events over Zhongshan mostly occur in summer and equinoxes during local night and morning. The majority of these events lasted between ∼4 and ∼8 hr. Most events disappeared early in the morning. Statistics of the Spearman correlation coefficient values show that ∼9% of NRE amplitude modulation could be due to the MSTIDs. There are almost equal numbers of negative and positive Spearman correlation coefficient values. The relative velocity between the E‐region NREs and the F‐region MSTIDs switching the electric field polarities between the crests and troughs could be the cause of those equal number of the Spearman correlation coefficient values. The orientation of the ionospheric current relative to the MSTID polarization electric field may also play a significant role in the reported Spearman correlation coefficient values. We argue that in some cases, the TIDs might have been close enough to the NREs altitude to modulate them directly by transporting the plasma up and down through shear or compression.

show abstract

Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Simultaneous Occurrence of Traveling Ionospheric Disturbances, Farley Buneman and Gradient Drift Instabilities Observed by the Zhongshan SuperDARN HF Radar

Hiyadutuje,

Habarulema,

Kosch

et al. 2024

JGR Space Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous studies have suggested that coupling between the E and the F regions and sporadic-E layers can augment and enhance the instabilities associated with MSTIDs (Ogawa et al, 2009;Otsuka et al, 2007). Hiyadutuje et al (2022) examined the relation between far-range and near-range echoes observed by SuperDARN and suggested that MSTIDs in the F region can partially modulate an existing Gradient Drift Instability in the E region. Overall, strong coupling between the E and F regions of the ionosphere was observed during certain MSTID intervals.…”

Section: Discussionmentioning

confidence: 99%

“…Hiyadutuje et al. (2022) examined the relation between far‐range and near‐range echoes observed by SuperDARN and suggested that MSTIDs in the F region can partially modulate an existing Gradient Drift Instability in the E region. Overall, strong coupling between the E and F regions of the ionosphere was observed during certain MSTID intervals.…”

Section: Discussionmentioning

confidence: 99%

Storm Time Electrified MSTIDs Observed Over Mid‐Latitude North America

et al. 2023

View full text Add to dashboard Cite

Traveling Ionospheric Disturbances (TIDs; Munro, 1948) are wave-like structures which propagate through the ionosphere. TIDs are most commonly expected to be driven by Atmospheric Gravity Waves (AGWs) originating in the neutral atmosphere (Hines, 1960) and can be sensed with instruments used for monitoring ionospheric dynamics such as Global Navigational Satellite Service (GNSS) Total Electron Content (TEC;Saito et al., 1998) and coherent scatter radars (Fukao et al., 1991;Samson et al., 1990). TIDs are further classified as either Large-Scale (LSTIDs) or MSTIDs based on their spatio-temporal scales (Georges, 1968). MSTIDs typically have a time period of 15-60 min, phase velocities of 100-300 m/s, and wavelengths between 200 and 800 km. On the other hand, LSTIDs have phase speeds between 400 and 10,00 m/s, periods above 30 min, and wavelengths above 1,000 km (Hocke & Schlegel, 1996;Hunsucker, 1982). The differences between MSTIDs and LSTIDs are not just limited to their spatio-temporal scales, previous studies have shown that the underlying generation mechanisms and the physics of their propagation also differ (Hocke & Schlegel, 1996). MSTIDs are often linked to AGWs, which are a neutral atmospheric phenomenon generally carrying more energy than the TIDs themselves (Hunsucker, 1982). Such AGW-driven MSTIDs are more commonly reported at high latitudes, and on the dayside, and in the winter (Bristow et al., 1994;Frissell et al., 2014). The AGWs are in turn expected to be driven by factors such tropospheric weather (Chou et al., 2017), Joule heating (Chimonas & Hines, 1970), and ground-based disturbances including tsunamis and earthquakes (Liu et al., 2011). Determining the sources of AGWs/MSTIDs can be challenging since they travel thousands of kilometers from the source and dissipate along the propagation paths (e.g.,

show abstract

A Conjunction of Pc5 ULF Waves From Spaceborne and Ground‐Based Observations

Zhao,

Zong,

Liu

et al. 2023

JGR Space Physics

View full text Add to dashboard Cite

Large scale (low wavenumber m) ULF waves observed in the inner magnetosphere can propagate into the ionosphere and to the ground, which is recognized as magnetic pulsations by ground‐based magnetometers. We present the conjunctive observations of Pc5 ULF waves from Van Allen Probes (at ∼6MLT, earlier), GOES13 (at ∼1MLT, later), SuperDARN radar (at ∼6MLT), and ground magnetometers. The phase shifts of the waves observed by satellites at different MLTs indicate westward propagation from the noon sector. The traveling Alfven waves are thought to propagate along the field line and reflect mostly at the ionosphere, while a few wave energy leak from the ionosphere to the ground. Thus, we suppose that standing waves are observed by the spacecraft while traveling signals are observed by the ground‐based magnetometers in the form of electromagnetic waves. By mapping the ground magnetic pulsations to the magnetic equatorial plane (which depends on the total ionosphere conductivity from IRI and MSIS model), the expected ULF waves match well with the satellite observations. Besides, it suggests that the ionosphere conductivity can be estimated from the conjunctive ULF waves observed on the ground and in the magnetosphere. The calculated total conductivity is 15 − 30% higher than the model.

show abstract

First Observations of E‐Region Near Range Echoes Partially Modulated by F‐Region Traveling Ionospheric Disturbances Observed by the Same SuperDARN HF Radar

Cited by 3 publications

References 82 publications

Simultaneous Occurrence of Traveling Ionospheric Disturbances, Farley Buneman and Gradient Drift Instabilities Observed by the Zhongshan SuperDARN HF Radar

Simultaneous Occurrence of Traveling Ionospheric Disturbances, Farley Buneman and Gradient Drift Instabilities Observed by the Zhongshan SuperDARN HF Radar

Storm Time Electrified MSTIDs Observed Over Mid‐Latitude North America

A Conjunction of Pc5 ULF Waves From Spaceborne and Ground‐Based Observations

Contact Info

Product

Resources

About