Physical Origin of Short Scale Plasma Structures in the Auroral F Region

Bisai, N.; Sen, Abhijit

doi:10.1029/2020ja028422

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…The spread F is commonly attributed to smaller-scale irregularities generated at larger-scale gradients of electron density, which may be associated with MSTID. Such a mechanism was described in, (e.g., Bisai & Sen, 2021) who presented the simulation model for the linear and non-linear plasma flow and wave (disturbance) propagation in the large to small scale of frequencies in the auroral F region. Also, Atul et al (2018) describes the analytical model for the local and global auroral plasma flow and wave (disturbance) propagation in the auroral spread F region.…”

Section: Discussionmentioning

confidence: 99%

Statistics of Traveling Ionospheric Disturbances at High Latitudes Using a Rapid‐Run Ionosonde

Moges,

Sherstyukov,

Kozlovsky

et al. 2024

JGR Space Physics

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The potential of deep learning for the investigation of medium scale traveling ionospheric disturbances (MSTIDs) has been exploited through the Sodankylä rapid‐run ionosonde in this statistical study. The complementing observations of the Sodankylä ionosonde with those of the Sodankylä meteor radar reveals the diurnal and seasonal occurrence rate of high‐latitude MSTIDs in the recent low solar activity period, 2018–2020. In our results, the daytime, nighttime and dusk MSTIDs are predominantly identified during winter, summer, and equinoctial months, respectively. The winter daytime higher (lower) occurrence rate is well correlated with the lower (higher) altitude of the height of the F2‐layer peak (hmF2), and the low occurrence rate of the summer daytime is well correlated with the mesosphere‐lower‐thermosphere wind shear and higher gradient of temperature. Relatively high occurrence rate (>0.4) of summer nighttime MSTIDs has a general—but not one‐to‐one agreement—with post‐noon to evening IU (eastward auroral current index) inferred ionospheric conductivity. Rather, we see a one‐to‐one relationship between the summer nighttime MSTIDs and zonal wind shear suggesting that the wind shear‐induced electrodynamic processes could play significant roles for higher occurrence rate of MSTIDs. Furthermore, significant MSTIDs with ∼0.4 occurrence rate are so far revealed during spring and autumn transition periods. The enhanced nighttime MSTID amplitudes during the equinox are observed to be well correlated with IL index (westward auroral current indicator) suggesting that the particle precipitation during substorms could be the primary cause.

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Section: Discussionmentioning

confidence: 99%

Statistics of Traveling Ionospheric Disturbances at High Latitudes Using a Rapid‐Run Ionosonde

Moges,

Sherstyukov,

Kozlovsky

et al. 2024

JGR Space Physics

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“…Some of the polar cap patches exit the polar cap and enter the nightside auroral latitudes becoming boundary/auroral blobs [ 11 , 12 , 18 ] leading to strong plasma irregularities when combined with nightside aurora [ 13 ]. As discussed in [ 19 , 20 ], along the boundaries of such features sharp plasma density gradients with spatial scale size of several tens of kilometers exist.…”

Section: Introductionmentioning

confidence: 99%

High Latitude Ionospheric Gradient Observation Results from a Multi-Scale Network

Sokolova

Morrison

Jacobsen

2023

Sensors

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In this article, a cluster comprised of eight Continuously Operating Reference Station (CORS) receivers surrounding five supplemental test stations located on much shorter baselines is used to form a composite multi-scale network for the purpose of isolating, extracting, and analyzing ionospheric spatial gradient phenomena. The purpose of this investigation is to characterize the levels of spatial decorrelation between the stations in the cluster during the periods with increased ionospheric activity. The location of the selected receiver cluster is at the auroral zone at night-time (cluster centered at about 69.5° N, 19° E) known to frequently have increased ionospheric activity and observe smaller size of high-density irregularities. As typical CORS networks are relatively sparse, there is a possibility that spatially small-scale ionospheric delay gradients might not be observed by the network/closest receiver cluster but might affect the user, resulting in residual errors affecting system accuracy and integrity. The article presents high level statistical observations based on several hundred manually validated ionospheric spatial gradient events along with low level analysis of specific events with notable temporal/spatial characteristics.

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“…There are several different processes that can structure the plasma in the auroral oval (See e.g. [22][23][24][25][26]), and the structured plasma has been directly linked to signal disturbances (e.g. [27][28][29]).…”

Section: Introductionmentioning

confidence: 99%

Study of time- and distance-dependent degradations of network RTK performance at high latitudes in Norway

et al. 2023

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In this study we examine the performance of a network real-time kinematic (NRTK) positioning service at high latitudes ($$\approx 70^o$$ ≈ 70 o N). The NRTK used is the Norwegian national positioning service “CPOS”. To test the performance, 6 geodetic quality receivers were deployed at various distances from the network receivers and used to collect positioning data for most of the year 2021. This test network is located in the night-time auroral oval region during normal conditions. Statistics are presented showing variation in performance as a function of the distance to the nearest NRTK receiver and as a function of the time-of-day. Performance is found to be significantly degraded during night-time, with approximately ten-fold increases of the occurrence of large positioning errors and significant increases in the time-to-fix. The distance from the network was also found to be a factor for significant performance degradation, with approximately ten-fold increases in the occurrence of large positioning errors when comparing results from a receiver close to the network (1.2 km) to a receiver a moderate distance away (11.5 km). The cause of the observed degradations are likely small-scale ionospheric density structures in the auroral oval region. Observational evidence of such gradients is shown.

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Physical Origin of Short Scale Plasma Structures in the Auroral F Region

Cited by 4 publications

References 38 publications

Statistics of Traveling Ionospheric Disturbances at High Latitudes Using a Rapid‐Run Ionosonde

Statistics of Traveling Ionospheric Disturbances at High Latitudes Using a Rapid‐Run Ionosonde

High Latitude Ionospheric Gradient Observation Results from a Multi-Scale Network

Study of time- and distance-dependent degradations of network RTK performance at high latitudes in Norway

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