All‐Sky Imaging Observations of the Interaction Between the Brightness Wave and ESF Airglow Depletions

Hickey, D. A.; Martinis, C. R.

doi:10.1029/2019ja027232

Cited by 4 publications

References 36 publications

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Secondary instability generated on the equatorial plasma bubbles wall due to an interaction with midnight brightness wave

Figueiredo,

Miranda,

Wrasse

et al. 2023

Earth Planets Space

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Interaction between Equatorial Plasma Bubbles (EPBs) and midnight Brightness wave (MBW) was observed over Bom Jesus da Lapa (13.3° S, 43.5° W; Quasi-Dipole geomagnetic latitude of 14.1° S), using OI 630 nm all-sky images. On the night of December 22nd, 2019, an EPB was seen propagating eastward in its fossil stage until it interacted with an MBW. After the interaction, the west walls of EPBs generated secondary instabilities that can be associated with gradient drift instability (GDI) and/or Kelvin–Helmholtz instabilities (KHI). We suggest that the MBW contributed to generate a shear in the EPBs walls due to changes in the thermospheric dynamics, such as neutral wind in the F layer height. Furthermore, spectral analysis of the all-sky images suggests that GDI and/or KHI generated turbulence and helped to dissipate the EPBs. Graphical Abstract

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Secondary instability generated on the equatorial plasma bubbles wall due to an interaction with midnight brightness wave

Figueiredo,

Miranda,

Wrasse

et al. 2023

Earth Planets Space

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Signature of white bubbles in the equatorial ionosphere

Takahashi,

Figueiredo,

Wrasse

et al. 2024

Preprint

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From airglow OI 630 nm observations in the low-latitude ionosphere, we observed an enhancement of the emission rate inside of plasma bubbles (EPBs). It occurred, on some occasions, after the local midnight during the equinox seasons. The all-sky imager has been operated at Bom Jesus da Lapa (BJL) (13.3°S, 43.5°W, dip.14.1°S). In the night of 7–8 October 2021, a dark plasma bubble turned into a bright one due to an enhancement of the OI 630 nm emission rate, which we call it as White Bubble (WhB). Prior to the WhB appearance, the imager detected a presence of Midnight Brightness Wave (MBW) moving rapidly from the equator to the south of BJL. At the same time, a downward movement of the height of the F-layer was observed at Cachoeira Paulista (22.7 °S, 45.0 °W, dip. 18.1°S). We further observed that the WhB extended equatorward when the EPB eastward drift increased. Similar WhBs were observed on seven nights during 2021–2022. These observational facts suggested that the MBW interacted with EPB, causing the depletion inside of EPB to be filled with plasma, resulting in the generation of WhB.

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Influences of the quasi-two-day wave on plasma bubble behavior over south America

Bossert,

Kumari,

Inchin

et al. 2024

Front. Astron. Space Sci.

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Equatorial Plasma Bubbles (EPBs) are a region of depleted ionospheric densities. EPBs are known to fluctuate both seasonally and day to day, and have been linked to changes in solar activity, geomagnetic activity, and seeding resulting from dynamics occurring at lower altitudes. Here, EPB activity is investigated over a 15-day period with overlapping coincident ground-based 630 nm oxygen airglow measurements, near-infrared hydroxyl mesospheric temperature mapper (MTM) measurements, and Rate Of change of Total Electron Content Index (ROTI) values. The data are compared with the Navy Global Environmental Model (NAVGEM) reanalysis over the same time period. It is found that several days with strong EPB activity coincided with the positive/northward meridional wind phase of the quasi-two-day wave (QTDW) in the mesosphere. These initial observations indicate correlations of the QTDW phase and the occurrence rates of EPBs, and suggest a need for further investigations to assess potential causal relationships that may affect the variability and prevalence of EPBs.

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All‐Sky Imaging Observations of the Interaction Between the Brightness Wave and ESF Airglow Depletions

Cited by 4 publications

References 36 publications

Secondary instability generated on the equatorial plasma bubbles wall due to an interaction with midnight brightness wave

Secondary instability generated on the equatorial plasma bubbles wall due to an interaction with midnight brightness wave

Signature of white bubbles in the equatorial ionosphere

Influences of the quasi-two-day wave on plasma bubble behavior over south America

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