Characteristics of the O+(2P–2D) 732.0 and 733.0 nm airglow emissions observed with WINDII and simulated with the C‐IAM

Shepherd, G. G.; Cho, Youngmin; Fomichev, V. I.; Martynenko, O. V.

doi:10.1002/2014gl060840

Cited by 5 publications

(2 citation statements)

References 22 publications

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“…The signatures of CPEs have been identified by the observations of anomalous enhancements in the electron and ion temperatures, electron density, airglow, and photoelectron flux (Bennett, 1969; Buckley & Moos, 1971; H. C. Carlson, 1966; R. W. Carlson & Suzuki, 1974; Chao et al., 2003; Christensen, 1975; Evans, 1967; Evans & Gastman, 1970; Kakinami et al., 2010; Kil et al., 2020; Meier, 1971; Oyama et al., 1996; Shepherd et al., 2014; Solomon et al., 2020; Yang et al., 2020). Most of these studies focused on event‐based case studies using observations during limited periods.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Detection of Signatures of Conjugate Photoelectrons in the Ionosphere and Thermosphere

2022

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We investigate the impact of conjugate photoelectrons (CPEs) on the topside (∼600 km altitude) ionosphere at low and midlatitudes using measurements of the ion temperature, density, and composition from the first Republic of China satellite during a period of the high to moderate solar activity (March 1999 to June 2004). Elevated ion temperatures and densities are observed in the dark Northern American‐Atlantic sector during the December solstice and in the Australian sector during the June solstice. The oxygen ion fraction and density are also elevated at these locations. These observations indicate that photoelectrons from the conjugate hemisphere heat the local ionospheric plasma. The morphology of the ion temperature in the winter hemisphere is well represented by the solar zenith angle in the sunlit conjugate hemisphere. The CPE hypothesis for the observed ionospheric heating is confirmed by coincident nighttime enhancements of the far ultraviolet airglow measured by the Global Ultraviolet Imager onboard the Thermosphere Ionosphere Mesosphere Energetics and Dynamics satellite.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Detection of Signatures of Conjugate Photoelectrons in the Ionosphere and Thermosphere

2022

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“…"Conjugate photoelectrons" represent those suprathermal electrons that have traveled from the magnetic conjugate locations. Conjugate photoelectrons are manifested by the observations of electron temperature enhancement at predawn by radars (Carlson, 1966;Evans, 1967;Evans & Gastman, 1970) and satellites (Kakinami et al, 2010;Oyama et al, 1996), observations of airglow at visual (Bennett, 1969;Carlson & Suzuki, 1974;Christensen, 1975;Duboin et al, 1968;Shepherd et al, 2014) and far ultraviolet (FUV) (Buckley & Moos, 1971;Meier, 1971) wavelengths, measurements of photoelectron fluxes by satellites (Peterson et al, 1977(Peterson et al, , 2009Richards & Peterson, 2008), and simultaneous in situ rocket measurements of airglow, electron density and temperature, and photoelectron flux (Shepherd et al, 1978). A variety of methods have been used to model the generation, transport, and impact of photoelectrons (Varney et al, 2012, and references therein).…”

Section: Introductionmentioning

confidence: 99%

The Far Ultraviolet Signatures of Conjugate Photoelectrons Seen by the Special Sensor Ultraviolet Spectrographic Imager

Kil

Schaefer

Paxton

et al. 2020

Geophysical Research Letters

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This study investigates the origin of anomalous far ultraviolet emissions observed at night at the subauroral region by the Special Sensor Ultraviolet Spectrographic Imager on board the Defense Meteorological Satellite System‐F16 satellite. The global distribution of the anomalous emission is derived using the measurements of the oxygen atom 130.4‐nm emission in 2017. Our results show the extension of the anomalous emission from high latitudes to middle latitudes in the Northern American‐Atlantic sector during the December solstice and in the Southern Australia‐New Zealand sector during the June solstice. These observations indicate that the anomalous emission occurs in the winter hemisphere and is pronounced at locations close to the magnetic poles. The good agreement between the morphology of the anomalous emission and the predicted distribution of conjugate photoelectrons leads to the conclusion that the anomalous emissions are the signatures of conjugate photoelectrons.

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Thermospheric atomic oxygen concentrations from WINDII O+(2P→2D) 732 nm emission: Comparisons with the NRLMSISE-00 and C-IAM models and with GUVI observations

Shepherd

Cho

Fomichev

et al. 2016

Journal of Atmospheric and Solar-Terrestrial Physics

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Characteristics of the O⁺(²P–²D) 732.0 and 733.0 nm airglow emissions observed with WINDII and simulated with the C‐IAM

Cited by 5 publications

References 22 publications

Simultaneous Detection of Signatures of Conjugate Photoelectrons in the Ionosphere and Thermosphere

Simultaneous Detection of Signatures of Conjugate Photoelectrons in the Ionosphere and Thermosphere

The Far Ultraviolet Signatures of Conjugate Photoelectrons Seen by the Special Sensor Ultraviolet Spectrographic Imager

Thermospheric atomic oxygen concentrations from WINDII O+(2P→2D) 732 nm emission: Comparisons with the NRLMSISE-00 and C-IAM models and with GUVI observations

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