On the behavior of thermospheric O1D 630.0 nm dayglow emission during counter electrojet events

Vineeth, C.; Ambili, K. M.; Pant, Tarun Kumar

doi:10.1016/j.asr.2022.08.048

Cited by 1 publication

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References 43 publications

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“…The maximum drift velocity value obtained from the SF model was assigned to the highest Δ H value during noon time, and all other values were scaled accordingly. This approach was also used in a previous study too to understand the observed density enhancements during Counter Electrojet periods (Vineeth et al., 2023). The ground magnetometer data of the H component of the geomagnetic field with a 1–hour resolution from Tirunelveli and Alibagh stations were obtained from the World Data Centre (WDC), Kyoto, Japan (http://wdc.kugi.kyoto-u.ac.jp/index.html).…”

Section: Derivation Of the E × B Drift Velocity Using Different Methodsmentioning

confidence: 99%

A Numerical Study on the Impact of E × B Drift on the Vertical Distribution of the Plasma Density Over the Geomagnetic Equatorial Ionospheric Region

Ashok,

Ambili,

Choudhary

2024

JGR Space Physics

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Using an in–house developed Quasi Two–Dimensional (QTD) physics–based ionospheric model, the impact of E × B drift velocity on the vertical distribution of the electron density over the equatorial latitude has been investigated. The vertical drift measurements from (a) drift analysis software of Digisonde (b) derived from Digisonde ionograms (c) calculated from the Scherliess–Fejer (SF) model, and (d) obtained from the magnetometer ΔH measurements have been used in this study. Four quiet days in a low solar activity year, representing four seasons of the year 2010, have been chosen for the study. The model–derived electron density profiles using the vertical drifts from all four methods matched well with the Digisonde observation below ∼150 km at all the Local Times (LTs) for all 4 days. However, since the Digisonde–derived drifts were very low, centered mostly around zero, it led to the overestimation/underestimation of the F–region peak plasma density (nmF2)/height (hmF2). The model simulated electron density profiles using the SF model, and ΔH derived vertical drifts showed good agreement with the observation up to an altitude of ∼350 km. The study showed that vertical drift is a factor that controls the nmF2 trough around noon over the equatorial latitude. It is seen that plasma diffusion occurs only beyond an altitude of 350 km, while the range of altitudes between 320 and 350 km acts as the “diffusion threshold height.” This finding has significant implications for understanding plasma dynamics in the equatorial ionosphere.

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Section: Derivation Of the E × B Drift Velocity Using Different Methodsmentioning

confidence: 99%

A Numerical Study on the Impact of E × B Drift on the Vertical Distribution of the Plasma Density Over the Geomagnetic Equatorial Ionospheric Region

Ashok,

Ambili,

Choudhary

2024

JGR Space Physics

View full text Add to dashboard Cite

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On the behavior of thermospheric O1D 630.0 nm dayglow emission during counter electrojet events

Cited by 1 publication

References 43 publications

A Numerical Study on the Impact of E × B Drift on the Vertical Distribution of the Plasma Density Over the Geomagnetic Equatorial Ionospheric Region

A Numerical Study on the Impact of E × B Drift on the Vertical Distribution of the Plasma Density Over the Geomagnetic Equatorial Ionospheric Region

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