English
norskBlar i forfatter "Ivarsen, Magnus Fagernes"
Viser treff 1-7 av 7
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The Distribution of Small-Scale Irregularities in the E-Region, and Its Tendency to Match the Spectrum of Field-Aligned Current Structures in the F-Region
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-16)We associate new data from icebear, a coherent scatter radar located in Saskatchewan, Canada, with scale-dependent physics in the ionosphere. We subject the large-scale icebear 3D echo patterns (treated as 2D point clouds) to a data analysis technique hitherto never applied to the ionosphere, a technique that is widely applied in cosmological red-shift surveys to characterize the spatial clustering ... -
The future of auroral E-region plasma turbulence research
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-15)The heating caused by ionospheric E-region plasma turbulence has documented global implications for the energy transfer from space into the terrestrial atmosphere. Traveling atmospheric disturbances, neutral wind motion, energy deposition rates, and ionospheric conductance have all been shown to be potentially affected by turbulent plasma heating. Therefore it is proposed to enhance and expand ... -
GNSS Scintillations in the Cusp, and the Role of Precipitating Particle Energy Fluxes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-16)Using a large data set of ground-based GNSS scintillation observations coupled with in situ particle detector data, we perform a statistical analysis of both the input energy flux from precipitating particles, and the observed occurrence of density irregularities in the northern hemisphere cusp. By examining trends in the two data sets relating to geomagnetic activity, we conclude that observations ... -
Investigating Spatial and Temporal Structuring of E-Region Coherent Scattering Regions Over Northern Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-26)Recently, it has been shown that the Spread Spectrum Interferometric Multistatic meteor radar Observing Network radar system located in northern Norway is capable of measuring ionospheric E-region coherent scatter with spatial and temporal resolutions on the order of 1.5 km and 2 s, respectively. Four different events from June and July of 2022 are examined in the present study, where the coherent ... -
Measuring small-scale plasma irregularities in the high-latitude E- and F-regions simultaneously
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-07-18)The ionosphere, Earth’s space environment, exhibits widespread turbulent structuring, or plasma irregularities, visualized by the auroral displays seen in Earth’s polar regions. Such plasma irregularities have been studied for decades, but plasma turbulence remains an elusive phenomenon. We combine scale-dependent measurements from a ground-based radar with satellite observations to characterize ... -
Statistical Distribution of Decameter Scale (50 m) Ionospheric Irregularities at High Latitudes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-15)We present a study of decameter scale ionospheric irregularities using in-situ electron density data from the NorSat-1 satellite. During the current period of low solar activity, NorSat-1 frequently observes significant plasma irregularities from several 10 s km down to several decameter. These are often observed near the dayside cusp and dawnside auroral zone. The decameter-scale irregularities are ... -
Steepening Plasma Density Spectra in the Ionosphere: The Crucial Role Played by a Strong E-Region
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-28)Based on the Swarm 16 Hz Advanced Plasma Density data set, and using the Swarm A satellite, we apply automatic detection of spectral breaks in seven million sampled plasma density power spectra in the high-latitude F-region ionosphere. This way, we survey the presence of plasma irregularity dissipation due to an enhanced E-region conductance, caused both by solar photoionization and particle ...
