Post-sunset wintertime 630.0 nm airglow perturbations associated with gravity waves at low latitudes in the South American sector

Sobral, J. H. A.; Borba, Gilvan Luiz; Abdu, M. A.; Batista, I. S.; Sawant, H. S.; Zamlutti, C. J.; Takahashi, H.; Nakamura, Yoshiharu

doi:10.1016/s1364-6826(96)00160-5

Cited by 16 publications

(17 citation statements)

References 27 publications

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“…The great variety of ST-linked phenomena in the atmosphere has resulted in a number of studies being carried out on the analysis of ionosphere parameter variations obtained by different methods of ionosphere sounding (Bezrodny and Yampolski, 1976;Popov and Yampolski, 1981;Galushko and Yampolski, 1983;Mishin et al, 1991;Drobzhev et al, 1992;Bezotosnyi et al, 1994;Beley et al, 1995;Sobral et al, 1997;Galushko et al, 1998;Hocke and Igarashi, 2002;Galushko et al, 2003). However, virtually all experimental data were obtained using indirect methods for analyzing the spectrum of ionosphere parameter variations, which can result from a number of factors.…”

Section: Introductionmentioning

confidence: 99%

First GPS-TEC evidence for the wave structure excited by the solar terminator

Afraimovich

2008

Earth Planet Sp

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Using TEC measurements from the global network of GPS receivers, we have obtained the first evidence for the wave structure excited by the solar terminator (ST), moving over the USA, Europe, and Japan. Two main types of the observed TEC disturbance were found: large-scale (LS) 60-min variations with an amplitude of about 0.5-1 TECU and medium-scale (MS) 15-min variations with an amplitude of about 0.05-0.1 TECU. The first type of disturbances was predicted in theoretical investigations and registered earlier using different methods of ionosphere radio sounding. The second type of the observed TEC disturbance is wave packets (WPs) generated when the time derivative of TEC is at its maximum. These WPs have duration of about 1-2 h and a time shift of about 1.5-2.5 h after the ST appearance at an altitude of 100 km. That ST-generated wave packets have been found for the first time. LS TEC disturbances and MS WPs are space-fixed along the ST line over a distance exceeding 1600 km.

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Section: Introductionmentioning

confidence: 99%

First GPS-TEC evidence for the wave structure excited by the solar terminator

Afraimovich

2008

Earth Planet Sp

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“…The former is the case of a plasma bubble and the latter case is a TID. But so far very few studies on F-region gravity waves have been done utilizing airglow data (Sobral et al, 1997;Mendillo et al, 1997;Mende et al, 1998). • 44 E) during auroral substorms.…”

Section: Discussionmentioning

confidence: 99%

630 nm nightglow observations from 17°N latitude

2014

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“…It is proposed that this similarity may be explained by MS-TIDs influencing both the F and D regions as they travel. Long delays of over 20 days are also found near the equator for airglow-measured MS-TIDs (Sobral et al, 1997). These are recorded infrequently and have equatorward motions, while normally eastward motions are measured at the equator.…”

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confidence: 82%

“…High controls were assessed from values ≥1.33 times each monthly average value and low controls for values ≤0.50 times the averages. Some of the data from the analyses reported here are taken from the airglow measurements of Sobral et al (1997). These measurements were made at Cachoeira Paulista (dip 28…”

Section: Data and Methods Of Analysismentioning

confidence: 99%

“…One relates to delays after GA experienced by D-region hydroxyl emissions (Shefov, 1969). This investigation has also considered airglow measurements by Sobral et al (1997) which detected equatorward moving MSTIDs at an equatorial location. These can be considered as distinct from MS-TIDs normally measured near the equator with eastward components of velocity (see results and references given by Sobral et al, 1985, andAbdu, 1991).…”

Section: Introductionmentioning

confidence: 99%

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Delayed traveling ionospheric disturbances, especially in equatorial regions, following geomagnetic activity

Bowman

Mortimer

2014

Earth Planet Sp

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For the Western-Pacific region spread-F has been found to occur with delays after geomagnetic activity (GA) ranging from 5 to 10 days as station groups are considered from low midlatitudes to equatorial regions. The statistical (superposed-epoch) analyses also indicate that at the equator the spread-F, and therefore associated medium-scale traveling ionospheric disturbances (MS-TIDs) occur with additional delays around 16, 22 and 28 days representing a 6-day modulation of the delay period. These results are compared with similar delays, including the modulation, for D-region enhanced hydroxyl emission (Shefov, 1969). It is proposed that this similarity may be explained by MS-TIDs influencing both the F and D regions as they travel. Long delays of over 20 days are also found near the equator for airglow-measured MS-TIDs (Sobral et al., 1997). These are recorded infrequently and have equatorward motions, while normally eastward motions are measured at the equator. Also in midlatitudes D-region absorption events have been shown (statistically) to have similar long delays after GA. It is suggested that atmospheric gravity waves and associated MS-TIDs may be generated by some of the precipitations responsible for the absorption. The recording of the delayed spread-F events depends on the GA being well below the average levels around sunset on the nights of recording. This implies that lower upper-atmosphere neutral particle densities are necessary.

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Post-sunset wintertime 630.0 nm airglow perturbations associated with gravity waves at low latitudes in the South American sector

Cited by 16 publications

References 27 publications

First GPS-TEC evidence for the wave structure excited by the solar terminator

First GPS-TEC evidence for the wave structure excited by the solar terminator

630 nm nightglow observations from 17°N latitude

Delayed traveling ionospheric disturbances, especially in equatorial regions, following geomagnetic activity

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