Polarization jet/SAID and plasma irregularities of various scales

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Abstract

The results of a study of the internal small-scale structure of a polarization jet/SAID using high-frequency data from various satellites are presented. The minimum size of irregularities and the typical internal composition of a stratified subauroral ion drift (SSAID) are confirmed. A two-peak structure has been found, which represents two large strata of the polarization jet/SAID. The shift of strata of electron density and temperature in latitude relative to each other is shown.

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About the authors

A. A. Sinevich

Space Research Institute of the Russian Academy of Sciences; Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of the Russian Academy of Sciences

Author for correspondence.
Email: sinevich.aa@gmail.com
Russian Federation, Moscow; Moscow

A. A. Chernyshov

Space Research Institute of the Russian Academy of Sciences

Email: sinevich.aa@gmail.com
Russian Federation, Moscow

D. V. Chugunin

Space Research Institute of the Russian Academy of Sciences

Email: sinevich.aa@gmail.com
Russian Federation, Moscow

W. J. Miloch

University of Oslo

Email: sinevich.aa@gmail.com
Norway, Oslo

M. M. Mogilevsky

Space Research Institute of the Russian Academy of Sciences

Email: sinevich.aa@gmail.com
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Development of the geomagnetic activity indices SME (blue line) and Dst (red line) from UT time during the considered geomagnetic event from 18 UT 13.03.2021 to 04 UT 14.03.2021. The blue and red stars indicate the moments of PD crossing by the DMSP F-16 (at 02:02 UT) and NorSat-1 (at 02:40 UT) satellites, respectively

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3. Fig. 2. Upper panel - variation of electron concentration (blue line), horizontal ion drift velocity (red line) and vertical ion drift velocity (purple line) from geomagnetic latitude (in AACGM - Altitude Adjusted Corrected Geomagnetic coordinates) (upper abscissa axis) and UT time (lower abscissa axis) from DMSP F-16 satellite data at an altitude of ~850 km during the geomagnetic event on 14. 03.2021 at 02 UT; bottom panel - change of MLT (purple line), electron temperature (blue line) and ion temperature (red line) from the DMSP F16 satellite data

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4. Fig. 3. Upper panel - variation of electron concentration (blue line) and temperature (red line) from geomagnetic latitude (dipole model, 110 km) (upper abscissa axis) and UT time (lower abscissa axis) from NorSat-1 satellite data at an altitude of ~600 km during the geomagnetic event on 14.03.2021 at 02 UT; middle panel - Fourier transform power spectrogram of electron concentration; lower panel - Fourier transform power spectrogram of electron temperature

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5. Fig. 4. Upper panel - variation of electron concentration (blue line) and ΔN/N parameter (colour scale) from geomagnetic latitude (dipole model, 110 km) (lower abscissa axis) and UT time (upper abscissa axis) from NorSat-1 satellite data at ~600 km altitude during the geomagnetic event on 14.03.2021 at 02 UT; lower panel - variation of electron temperature (red line) and ΔT/T parameter (colour scale) from NorSat-1 data

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