Experimental evidence for solar cycle and long-term change in the low-latitude MLT region

Clemesha, B. R.; Takahashi, H.; Simonich, D. M.; Gobbi, D.; Batista, P. P.

doi:10.1016/j.jastp.2004.07.027

Cited by 33 publications

(40 citation statements)

References 34 publications

(40 reference statements)

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“…These works showed the response of the mean annual hydroxyl temperature to solar activity from ∼1 K/100 sfu (Scheer et al, 2005) to ∼11 K/100 sfu (Clemesha et al, 2005). The results of the analysis presented here give 4÷5 K/100 sfu.…”

Section: Emission Characteristicssupporting

confidence: 51%

“…Nowadays a number of investigations of a response of the airglow characteristics to solar activity has been made (Burns et al, 2002;Gavrilyeva and Ammosov, 2002;Clemesha et al, 2005;Scheer et al, 2005;Golitsyn et al, 2006;Shefov et al, 2006). These works showed the response of the mean annual hydroxyl temperature to solar activity from ∼1 K/100 sfu (Scheer et al, 2005) to ∼11 K/100 sfu (Clemesha et al, 2005).…”

Section: Emission Characteristicsmentioning

confidence: 99%

“…Recently Beig et al (2003) have drawn special attention to the importance of solar activity influence on the MLT region. A number of papers on this problem has been published (Burns et al, 2002;Gavrilyeva and Ammosov, 2002;Clemesha et al, 2005;Scheer et al, 2005;Beig, 2006;Golitsyn et al, 2006;Liu and Shepherd, 2006). They showed that the investigation of the solar signature in variations of the MLT emission characteristics require highprecision measurements.…”

Section: Introductionmentioning

confidence: 99%

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Response of the mesopause airglow to solar activity inferred from measurements at Zvenigorod, Russia

Pertsev

Perminov

2008

Ann. Geophys.

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Abstract.Ground-based spectrographical observations of infrared emissions of the mesopause region have been made at Zvenigorod Observatory (56 N, 37 E), located near Moscow, Russia, for 670 nights of [2000][2001][2002][2003][2004][2005][2006]. The characteristics of the hydroxyl and molecular oxygen (865 nm) airglow, heights of which correspond to 87 and 94 km, are analyzed for finding their response to solar activity. The measured data exhibit a response to the F 10.7 solar radio flux change, which is 30%-40%/100 sfu in intensities of the emissions and about 4.5 K/100 sfu in hydroxyl temperature. Seasonal variations of the airglow response to solar activity are observed. In winter it is more significant than in summer. Mechanisms that may provide an explanation of the solar influence on intensities of the emissions and temperature are considered. Radiative processes not involving atmospheric dynamics appear insufficient to explain the observed effect.

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Section: Emission Characteristicssupporting

confidence: 51%

Section: Emission Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Response of the mesopause airglow to solar activity inferred from measurements at Zvenigorod, Russia

Pertsev

Perminov

2008

Ann. Geophys.

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“…The 11-year oscillations are seen in the mesosphere and lower thermosphere (MLT) and become stronger in the UMLT (figures not shown). Clemesha et al [42] and Huang et al [41] indicate that the 11-year oscillations seen in the MLT are highly correlated with the varying ultraviolet flux of the 11-year solar cycle. The four-year oscillation can also be seen at 85 km, with a stronger peak in the southern hemisphere.…”

Section: Lomb-scargle Spectral Analysismentioning

confidence: 99%

Properties of the Long-Term Oscillations in the Middle Atmosphere Based on Observations from TIMED/SABER Instrument and FPI over Kelan

et al. 2017

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Abstract:The properties of the long-term oscillations in the middle atmosphere have been investigated using the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature data and Fabry-Perot interferometer (FPI) data. Results for SABER temperature show that the semiannual oscillation (SAO) has three amplitude maxima at altitudes of 45, 75, and 85 km, respectively, and shows prominent seasonal asymmetries there. The SAOs in the upper mesosphere (75 km) are out of phase with those in the mesopause (85 km) in the tropical regions, which can generate an enhancement of 11 K on average at each equinox, contributing to the lower mesospheric inversion layer (MIL). It is shown that stronger enhancement can be found at the spring equinox than at the autumn equinox. The triennial oscillation (TO) is significant in the tropical region. The spectral peak of the TO is probably a sub-peak of the quasi-biennial oscillation (QBO) and is due to modulation of QBO. In addition, there may be potential interaction of the TO with SAO at 85 km at the equator. The relation between ENSO and TO has also been discussed. The ENSO signal may modulate the amplitude of the TO, mainly in the lower stratosphere. The annual oscillation (AO) and SAO are analyzed over Kelan by FPI data. Generally, the amplitudes of FPI wind are smaller than those of the Horizontal Wind Model (HWM07). The comparison between FPI and TIMED Doppler Interferometer (TIDI) winds shows relatively large discrepancy. This may be due to the tidal aliasing in the nighttime results derived from the FPI data. Results also show that the algorithm to derive FPI temperature needs improvements.

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“…The 11-year oscillations are seen in the mesosphere and lower thermosphere (MLT) and become stronger in the UMLT (figures not shown). Clemesha et al [21] and Huang et al [22] indicate that the 11-year oscillations seen in the MLT are highly correlated with the varying ultraviolet flux of the 11-year solar cycle.…”

Section: Lomb-scargle Spectral Analysismentioning

confidence: 99%

Properties of the long-term oscillations in the middle atmosphere based on observations from TIMED/SABER

Zhang¹,

Zhou²,

Shi³

et al. 2016

Preprint

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Abstract:The properties of the annual, semiannual and triennial oscillations (AO, SAO and TO) in the middle atmosphere have been investigated using the TIMED/SABER temperature data. The Lomb-Scargle and wavelet spectra were used to determine the dominant oscillations in the background temperature field. The AO is prominent at the mid-latitudes. The AO amplitudes present an asymmetry between the two Hemispheres, being larger in the mesosphere than in the stratosphere. The SAO dominates the tropical regions, with three amplitude maxima at altitudes of 45, 75, and 85 km. The SAOs in the upper mesosphere (75 km) are out of phase with those in the mesopause (85 km) in the tropical regions, which can generate an enhancement of 11 K at each equinox, contributing to the lower mesospheric inversion layer. The TO is significant in the tropical region, with amplitude being maximum at 35, 45 and 85 km. Result shows that there may be potential interaction by the TO with SAO at 85km at the equator. The relation between ENSO and TO has also been discussed. The ENSO signal may modulate the amplitude of the TO, mainly in the lower stratosphere. The real origin of the TO may lie in the wave-mean-flow interaction.

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Experimental evidence for solar cycle and long-term change in the low-latitude MLT region

Cited by 33 publications

References 34 publications

Response of the mesopause airglow to solar activity inferred from measurements at Zvenigorod, Russia

Response of the mesopause airglow to solar activity inferred from measurements at Zvenigorod, Russia

Properties of the Long-Term Oscillations in the Middle Atmosphere Based on Observations from TIMED/SABER Instrument and FPI over Kelan

Properties of the long-term oscillations in the middle atmosphere based on observations from TIMED/SABER

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