Comparison of Digisonde derived ion drifts and SuperDARN line-of-sight velocities over Zhongshan Station, Antarctica

Chen, X.; Liu, Jianjun; Liu, Ruiyuan; Hu, Hongqiao; Zhang, Beichen; Yukimatu, A. S.

doi:10.1016/j.polar.2022.100789

Cited by 2 publications

(4 citation statements)

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“…In addition, a digisonde measures the Doppler frequency shifts to measure the line‐of‐sight (LoS) Doppler velocity for individual echoes. With the help of the elevation look angle of the system, virtual height models, and least square fitting, we can decompose the observed LoS Doppler velocity to its vertical and horizontal components (e.g., Chen et al., 2022). ZHO digisonde currently operates with the following parameter set frequency range of 0.5–9.5 MHz and has height, Doppler, and temporal resolutions of 2.5 km, 0.1302 Hz, and 5 min (Liu et al., 1997).…”

Section: Instrumentation and Data Setmentioning

confidence: 99%

Transient Response of Polar‐Cusp Ionosphere to an Interplanetary Shock

et al. 2023

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Geomagnetic field and plasma convection on Earth are strongly affected by interplanetary (IP) shocks and solar wind dynamic pressure pulses [P dyn ] (e.g., Boudouridis et al., 2007;Yue et al., 2010). After the IP shock hits the magnetosphere, the magnetopause moves inward, toward the Earth and the eastward magnetopause current intensifies rapidly as a result of this prompt compression (Araki, 1994). In consequence, the horizontal component of the geomagnetic field in low and mid-latitudes typically responds with an abrupt increase due to an enhanced eastward magnetopause current. This sudden increase in the horizontal component of the geomagnetic field on the dayside is referred to as an sudden impulse (SI) event with a precise onset time (Araki, 1994). In comparison with their clear stepwise signatures in the lower latitude regions, SI-associated geomagnetic disturbances at Abstract Interplanetary (IP) shock-driven sudden compression of the Earth's magnetosphere produces electromagnetic disturbances in the polar ionosphere. Several studies have examined the effects of IP shock on magnetosphere-ionosphere coupling systems using all-sky cameras and radars. In this study, we examine responses and drivers of the polar ionosphere following an IP shock compression on 16 June 2012. We observe the vertical drift and concurrent horizontal motion of the plasma. Observations from digisonde located at Antarctic Zhongshan station (ZHO) showed an ionospheric thick E region ionization and associated vertical downward plasma motion at F region. In addition, horizontal ionospheric convection reversals were observed on the Super Dual Auroral Radar Network ZHO and McMurdo radar observations. Findings suggest that the transient convective reversal breaks the original shear equilibrium, it is expected that the IP shock-induced electric field triggers an enhanced velocity shear mapping to the E region. The horizontal motion of the plasma was attributed to only the dusk-to-dawn electric field that existed during the preliminary phase of sudden impulse. We also found that ionospheric convection reversals were driven by a downward field-aligned current. The results of these observations reveal, for the first time, the immediate and direct cusp ionosphere response to the IP shock, which is critical for understanding the global response of the magnetosphere following an abrupt change in Interplanetory Magnetic Field (IMF) and solar wind conditions.Plain Language Summary On 16 June 2012, an interplanetary (IP) shock hit near-Earth space (geospace), resulting in enhanced plasma convection, auroral intensifications, and altering electric current systems in the high-and polar-latitude ionosphere. We present a case study characterizing the effect of IP shock-driven sudden impulse (SI) impact on geospace systems that changes vertical drift and horizontal convection observed by digital ionosonde and Super Dual Auroral Radar Network high-frequency radars. We found an SI-driven immediate vertical downward plasma motion, the sudden appearance of sp...

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Section: Instrumentation and Data Setmentioning

confidence: 99%

Transient Response of Polar‐Cusp Ionosphere to an Interplanetary Shock

et al. 2023

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“…The measurements of ion drift by sounding techniques have been evaluated earlier using other independent measurements of ion drifts by ISRs and SuperDARN radars (Chen et al, 2022;Grant et al, 1995;Koustov et al, 2009;Mori et al, 2012;Sedgemore et al, 1996). Grant et al (1995) compared Digisonde's Doppler measurements of ion drift with the F-region plasma convection velocity measured by SuperDARN radars located in the northern Canada.…”

Section: Introductionmentioning

confidence: 99%

“…The measurements of ion drift by sounding techniques have been evaluated earlier using other independent measurements of ion drifts by ISRs and SuperDARN radars (Chen et al., 2022; Grant et al., 1995; Koustov et al., 2009; Mori et al., 2012; Sedgemore et al., 1996). Grant et al.…”

Section: Introductionmentioning

confidence: 99%

“…They showed that ISR and Dynasonde can be complementary techniques to observe the ionospheric density and velocity. Most recently, Chen et al (2022) performed a comparative study for Digisonde-derived ion drifts and SuperDARN line-of-sight (LOS) velocities over Zhongshan station,Antarctica (69.38°S,76.38°E). The SuperDARN radars used for the comparison are SuperDARN Syowa East (SYE) and Kerguelen (KER) radars that intersect with Zhongshan station.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Polar Ionospheric Observations by VIPIR/Dynasonde at Jang Bogo Station, Antarctica: 2. Ionospheric Ion Drift Velocity

Kwon,

Jee,

Ham

et al. 2024

JGR Space Physics

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Since the installation at the Antarctic Jang Bogo Station (JBS) in 2017, Korea Polar Research Institute (KOPRI) has been operating the Vertical Incidence Pulsed Ionospheric Radar (VIPIR) equipped with Dynasonde analysis (JVD). The two‐dimensional ion velocity is one of the key ionospheric parameters obtained from the JVD. The ionospheric ion velocities are compared with simultaneous, but independent, measurements of the Doppler velocity obtained from SuperDARN East radar at Dome C. The JVD ion velocity vector is projected to the line‐of‐sight direction of the SuperDARN observation over the JBS to be directly compared with each other. The result of comparison shows a reasonable agreement with the correlation coefficient of 0.72. The linear regression coefficient of about 0.5 represents that the JVD ion velocity is generally smaller than the SuperDARN observations by the regression coefficient, which may result from the different height ranges of the measurements. It is also found that the correlation coefficient increases with increasing magnetic activity (Kp), which suggests that the small‐scale ionospheric density irregularities tend to move with large‐scale plasma motion that is driven by enhanced plasma convection with increasing Kp.

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Comparison of Digisonde derived ion drifts and SuperDARN line-of-sight velocities over Zhongshan Station, Antarctica

Cited by 2 publications

References 35 publications

Transient Response of Polar‐Cusp Ionosphere to an Interplanetary Shock

Transient Response of Polar‐Cusp Ionosphere to an Interplanetary Shock

Assessment of Polar Ionospheric Observations by VIPIR/Dynasonde at Jang Bogo Station, Antarctica: 2. Ionospheric Ion Drift Velocity

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