Manifestation of Mesospheric Bores in the Night Airglow Over Yakutia

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The article describes two cases of observation of mesospheric bores, which are prominent wave fronts observed using night airglow data recorded by all-sky cameras over the central part of Yakutia (northeastern Siberia). The purpose of the work is to study the peculiarities of propagation and formation mechanism of this phenomenon. In the first case, the manifestation of a bore in the emissions of hydroxyl OH molecules at the level of the mesopause (altitude 87 km) and the green line of atomic oxygen [OI] (altitude 97 km) is described. In the second case, a description of a bore recorded in the emission of hydroxyl OH molecules is presented. The wavelength, phase velocity of propagation, wave period, direction of propagation, time and duration of the phenomenon, are calculated. Possible sources of formation of the mesospheric bore are also discussed.

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Sobre autores

O. Tyshchuk

Shafer Institute of Cosmophysical Research and Aeronomy of Siberian Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: oleSmile@mail.ru
Rússia, Yakutsk

I. Koltovskoy

Shafer Institute of Cosmophysical Research and Aeronomy of Siberian Branch of the Russian Academy of Sciences

Email: koltik@ikfia.ysn.ru
Rússia, Yakutsk

S. Nikolashkin

Shafer Institute of Cosmophysical Research and Aeronomy of Siberian Branch of the Russian Academy of Sciences

Email: nikolashkin@ikfia.ysn.ru
Rússia, Yakutsk

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2. Fig. 1. OH emission images from the ST-6 all-sky camera showing the movement of mesospheric boron on 19 November 2017 at 13:49 UT (boron appearance), 14:22 UT (boron at the camera zenith), and 14:49 UT (boron leaving the camera field of view). The top frames show images of the OH glow. The dark mesospheric boron and its propagation direction are indicated by black arrows. The lower frames show the TD images. The images are mirrored, with the compass in the upper right corner indicating the sides of the world (the northward direction is shifted by 10° clockwise).

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3. Fig. 2. TD emission [OI] images obtained by the Keo Sentry all-sky camera on 19 November 2017, showing the propagation of two oppositely directed groups of HGVs. The black arrow indicates the directions of motion of the wave disturbances, the white dashed line shows the boundary between them.

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4. Fig. 3. HE emission images from the ST-9 all-sky camera showing the movement of the mesospheric boron on 30 January 2022 at 11:40 UT (boron appearance), 12:04 UT (boron at the camera zenith), and 12:23 UT (leaving the camera field of view). The bright mesospheric boron and its propagation direction are indicated by white arrows.

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5. Fig. 4. Aura MLS data on 19 November 2017 (a) - satellite measurement points in the assumed boron distribution region are indicated by a square, asterisk indicates the Maimaga polygon, arrow indicates the direction of mesospheric boron motion; (b) - vertical profile of the upper atmosphere temperature; (c) - vertical profile of the Brent-Wäisälä frequency.

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6. Fig. 5. SABER TIMED data on 30 January 2022 (a) - satellite measurement points are indicated by a square, asterisk indicates the Maimaga polygon, arrow indicates the direction of mesospheric boron propagation; (b) - vertical profile of the MLT region temperature; (c) - vertical profile of the Brent-Wäisälä frequency.

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7. Fig. 6. Global wind map on 19 November 2017 at 12:00 UT at different geopotential heights (700, 500, 250, 70 hPa) [Beccario, 2024]. The asterisk indicates the Maimaga polygon. H - cyclone regions. The arrows serve as an indication of the air flow direction. The presumed area of mesospheric boron formation is highlighted by a frame.

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8. Fig. 7. Global wind map on 30 January 2022 at 11:00 UT at different geopotential heights (700, 500, 250, 70 hPa) [Beccario, 2024]. The designations are as in Fig. 6.

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