Climatology of Equatorial Plasma Bubbles in Ionospheric Connection
            Explorer/Far-UltraViolet (ICON/FUV) Limb Images

Park, Jaeheung; Mende, S. B.; Division, Korea Astronomy and Space Science Institute Harald U. Frey3 1Space Science

doi:10.5140/jass.2022.39.3.87

Cited by 4 publications

(4 citation statements)

References 52 publications

(39 reference statements)

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“…This phenomenon is also visible in prior studies, such as J. Park et al (2022). The phenomenon has been attributed to the sun's apparent location during the day and the solar terminator being nearly parallel to the QD field lines about the SAA.…”

Section: Plasma Bubble Detectionssupporting

confidence: 58%

Automated Detection and Tracking of Equatorial Plasma Bubbles Utilizing Global‐Scale Observations of the Limb and Disk (GOLD) 135.6 nm Data

Adkins,

England

2023

Earth and Space Science

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Equatorial plasma bubbles (EPBs) are regions of depleted plasma within the ionosphere that form during post‐sunset hours near the magnetic equator. EPBs tend to align with local geomagnetic field lines, extend hundreds of kilometers along geomagnetic longitudes, and thousands of kilometers along geomagnetic latitudes. EPBs can attenuate lower frequency radio waves, such as HF radar. Smaller features, usually 10s of meters, along the EPB's wall can interfere with centimeter scale wavelengths, such as GPS, via Bragg scattering. Statistical analysis of EPBs can further understanding of their occurrence and behavior. The current study utilizes Global‐Scale Observations of the Limb and Disk (GOLD) 135.6 nm nightglow data from 5 October 2018 to 30 September 2022. GOLD has a unique perspective from geostationary orbit, allowing consistent viewing of nightglow and structures over the Americas and Atlantic. An EPB detection method is developed and used to generate a database of occurrences. Occurrences are used to calculate EPB drift speeds and separations. All data is looked at as a whole, including any possible solar or geomagnetic disturbance periods. Seasonality in occurrence rate is evident. Occurrences peak during December solstice and minimize during June solstice for longitudes seen by GOLD. Within GOLD's view, higher occurrences are seen to the west during December solstice and to the east during June solstice. EPB drift speeds and separations show consistent distributions regardless of magnetic latitude region, geographic region, or season. This suggests EPBs behave consistently and regularly once formed, at least on spatial scales observed by GOLD.

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Section: Plasma Bubble Detectionssupporting

confidence: 58%

Automated Detection and Tracking of Equatorial Plasma Bubbles Utilizing Global‐Scale Observations of the Limb and Disk (GOLD) 135.6 nm Data

Adkins,

England

2023

Earth and Space Science

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“…Consequently, the ambient density shows, in agreement with earlier research, (1) the well-known zonal wavenumber-4 structures in the EIA and (2) offequatorial enhancement above the Caribbean. As a complement to other observations from FUV disk imagers and in-situ plasma probes, ICON/FUV data are expected to be useful in EPBs studies [21].…”

Section: Ionospherementioning

confidence: 99%

“…Nevertheless, there are no known instances of climatological analysis of EPBs using Far-UltraViolet (FUV) limb imaging devices. Park et al [21] investigated the small-scale measurement of oxygen ion density observed in limb images of FUV on board the Ionospheric Connection Explorer (ICON) with the aim of confirming the feasibility of using EPBs in climatological analysis. Two-dimensional limb images of oxygen airglow are available in the 135.6 nm and 157 nm channels via ICON/FUV.…”

Section: Ionospherementioning

confidence: 99%

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Latest Research Trends on Space Environments in Korea

Kim,

Lee,

Kim

2023

J. Space Technol. Appl.

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The Journal of Astronomy and Space Sciences (JASS) has published research papers on a range of topics since its initial publication in 1984, giving space science researchers a platform. In this paper, we reviewed recent publications (2019-2023) that deal with the space environment. In the space environment field, we reviewed 37 papers published in JASS during this time, covering research topics such as the sun, magnetosphere, ionosphere, atmosphere, and space radiation. We hope that researchers in the field will make use of this in the future as it will allow us to share the most recent trends in the field of space environment research that is currently underway.

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Ionosphere-thermosphere coupling via global-scale waves: new insights from two-years of concurrent in situ and remotely-sensed satellite observations

Gasperini,

Harding,

Crowley

et al. 2023

Front. Astron. Space Sci.

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Growing evidence indicates that a selected group of global-scale waves from the lower atmosphere constitute a significant source of ionosphere-thermosphere (IT, 100–600 km) variability. Due to the geometry of the magnetic field lines, this IT coupling occurs mainly at low latitudes (< 30°) and is driven by waves originating in the tropical troposphere such as the diurnal eastward propagating tide with zonal wave number s = −3 (DE3) and the quasi-3-day ultra-fast Kelvin wave with s = −1 (UFKW1). In this work, over 2 years of simultaneous in situ ion densities from Ion Velocity Meters (IVMs) onboard the Ionospheric Connection Explorer (ICON) near 590 km and the Scintillation Observations and Response of the Ionosphere to Electrodynamics (SORTIE) CubeSat near 420 km, along with remotely-sensed lower (ca. 105 km) and middle (ca. 220 km) thermospheric horizontal winds from ICON’s Michelson Interferometer for Global High-resolution Thermospheric Imaging (MIGHTI) are employed to demonstrate a rich spectrum of waves coupling these IT regions. Strong DE3 and UFKW1 topside ionospheric variations are traced to lower thermospheric zonal winds, while large diurnal s = 2 (DW2) and zonally symmetric (D0) variations are traced to middle thermospheric winds generated in situ. Analyses of diurnal tides from the Climatological Tidal Model of the Thermosphere (CTMT) reveal general agreement near 105 km, with larger discrepancies near 220 km due to in situ tidal generation not captured by CTMT. This study highlights the utility of simultaneous satellite measurements for studies of IT coupling via global-scale waves.

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Climatology of Equatorial Plasma Bubbles in Ionospheric Connection Explorer/Far-UltraViolet (ICON/FUV) Limb Images

Cited by 4 publications

References 52 publications

Automated Detection and Tracking of Equatorial Plasma Bubbles Utilizing Global‐Scale Observations of the Limb and Disk (GOLD) 135.6 nm Data

Automated Detection and Tracking of Equatorial Plasma Bubbles Utilizing Global‐Scale Observations of the Limb and Disk (GOLD) 135.6 nm Data

Latest Research Trends on Space Environments in Korea

Ionosphere-thermosphere coupling via global-scale waves: new insights from two-years of concurrent in situ and remotely-sensed satellite observations

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