Analysis of reasons of the geomagnetic storm on December 1–2, 2023, from interplanetary scintillation observations at the BSA LPI radio telescope

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The results of the analysis of interplanetary scintillation observation data obtained by the radio telescope Big Scanning Antenna of the Lebedev Physical Institute (BSA LPI) before, during and after the magnetic storm that occurred on December 1–2, 2023, are presented. The observational data are compared with model calculations for corotating and propagating large-scale disturbances. The results of observations of scintillating radio sources indicate that the magnetic storm that took place was caused by a superposition of two types of large-scale solar wind disturbances. On the day before the start of the magnetic storm, signs of interaction between the Earth’s magnetosphere and the corotating region of multi-velocity solar wind flows were observed, whereas later signs of magnetosphere disturbance by coronal mass ejection spreading after the M9.8 solar flare on November 28, 2023, were observed.

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V. Lukmanov

Lebedev Institute of Physics, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: astrojourn@pran.ru

Астрокосмический центр, Пущинская радиоастрономическая обсерватория

俄罗斯联邦, Pushchino

I. Chashei

Lebedev Institute of Physics, Russian Academy of Sciences

Email: astrojourn@pran.ru

Астрокосмический центр, Пущинская радиоастрономическая обсерватория

俄罗斯联邦, Pushchino

S. Tyul’bashev

Lebedev Institute of Physics, Russian Academy of Sciences

Email: astrojourn@pran.ru

Астрокосмический центр, Пущинская радиоастрономическая обсерватория

俄罗斯联邦, Pushchino

I. Subaev

Lebedev Institute of Physics, Russian Academy of Sciences

Email: astrojourn@pran.ru

Астрокосмический центр, Пущинская радиоастрономическая обсерватория

俄罗斯联邦, Pushchino

参考

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2. Fig. 1. Two-dimensional maps for November 30: a) results of scintillation observations (experimental data); b) model map for the SSC, the central axis of which passes through the projection of the Earth onto the plane of the solar equator on December 1, 2023 at 15:00 UT; c) model map for CME after the M9.8 flare, time of flare maximum 11/28/2023 19:50 UT, coordinates of the flare location S16 W00, CME propagation velocity 800 km/s, estimated time of CME arrival in the weak scintillation zone (from 0.4 AU and more) 11/29/2023 16:22 UT, estimated time of CME arrival to Earth 11/30/2023 23:32 UT, angle between the central axis of the CME and the Earth-Sun line φ=18.754°.

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3. Fig. 2. Two-dimensional maps for December 1. Similar to Fig. 1.

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4. Fig. 3. Two-dimensional maps for December 2. Similar to Fig. 1–2.

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5. Fig. 4. Two-dimensional maps for December 3. Similar to Figs. 1–3.

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6. Fig. 5. Time dependences of the solar wind speed and the concentration of interplanetary plasma protons according to WIND satellite data for the interval from November 28 to December 5, 2023, containing the event under consideration on December 1–2, 2023.

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