Solar cycle dependence and long-term trends in the wind field of the mesosphere/lower thermosphere

Bremer, J.; Schminder, R.; Greisiger, K. M.; Hoffmann, Peter; Kürschner, D.; Singer, W.

doi:10.1016/s1364-6826(96)00032-6

Cited by 84 publications

(118 citation statements)

References 26 publications

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“…At different heights the correlations are different, and nearly all are nonsignificant. Above 80 km the derived correlations are negative and in general agreement with most reported values for these heights by other authors (Sprenger and Schminder, 1969;Greisiger et al, 1987;Namboothiri et al, 1993Namboothiri et al, , 1994Bremer et al, 1997;Baumgaertner et al, 2005;Portnyagin et al, 2006). Only Fraser (1990) and Jacobi and Kürschner (2006) derived positive correlations.…”

Section: Influence Of the 11-year Solar Cyclesupporting

confidence: 91%

“…5 and 7). This positive correlation is confirmed by a lot of other investigations (Sprenger and Schminder, 1969;Dartt et al, 1983;Namboothiri et al, 1993Namboothiri et al, , 1994Bremer et al, 1997;Jacobi and Kürschner, 2006). A negative correlation was only derived by Greisiger et al (1987), Merzlyakov and Portnyagin (1999), and Middleton et al (2002).…”

Section: Influence Of the 11-year Solar Cyclesupporting

confidence: 68%

“…increasing easterly winds in summer and westerly winds in winter during the whole height range investigated between about 68 km until 93 km. The negative correlation between the summer zonal wind and the solar activity is confirmed by the majority of investigations with other data series (Greisiger et al, 1987;Namboothiri et al, 1993Namboothiri et al, , 1994Bremer et al, 1997;Jacobi, 1998;Jacobi and Kürschner, 2006). Only Dartt et al (1983) and Middleton et al (2002) reported about a positive correlation between summer zonal winds and solar activity.…”

Section: Influence Of the 11-year Solar Cyclesupporting

confidence: 62%

“…Therefore, the significance level during winter is mostly below 90%. Other authors found similar results for summer (Dartt et al, 1983;Jacobi, 1998;Merzlyakov and Portnyagin, 1999) and winter (Sprenger and Schminder, 1969;Bremer et al, 1997;Jacobi, 1998;Jacobi and Kürschner, 2006). But there are also some authors who found opposite results or no correlations.…”

Section: Influence Of the 11-year Solar Cyclementioning

confidence: 69%

“…The correlation between the semidiurnal tide and the solar activity, however, remains negative. Using observations at different stations, Bremer et al (1997) derived weakly negative correlations of the zonal wind, as well as the semidiurnal tidal amplitude with the solar activity, whereas for the meridional component and the diurnal tidal amplitude the correlations are nearly zero. Many further investigations have been carried out (Fraser, 1990;Namboothiri et al, 1993Namboothiri et al, , 1994Jacobi et al, 1997;Jacobi, 1998;Middleton et al, 2002;Baumgaertner et al, 2005).…”

Section: Introductionmentioning

confidence: 98%

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Long-term variations of the mesospheric wind field at mid-latitudes

Keuer¹,

Hoffmann²,

Singer³

et al. 2007

Ann. Geophys.

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Abstract. Continuous MF radar observations at the station Juliusruh (54.6 • N; 13.4 • E) have been analysed for the time interval between 1990 and 2005, to obtain information about solar activity-induced variations, as well as long-term trends in the mesospheric wind field. Using monthly median values of the zonal and the meridional prevailing wind components, as well as of the amplitude of the semidiurnal tide, regression analyses have been carried out with a dependence on solar activity and time. The solar activity causes a significant amplification of the zonal winds during summer (increasing easterly winds) and winter (increasing westerly winds). The meridional wind component is positively correlated with the solar activity during summer but during winter the correlation is very small and non significant. Also, the solar influence upon the amplitude of the semidiurnal tidal component is relatively small (in dependence on height partly positive and partly negative) and mostly non-significant.The derived trends in the zonal wind component during summer are below an altitude of about 83 km negative and above this height positive. During the winter months the trends are nearly opposite compared with the trends in summer (transition height near 86 km). The trends in the meridional wind components are below about 85 km positive in summer (significant) and near zero (nonsignificant) in winter; above this height during both seasons negative trends have been detected. The trends in the semidiurnal tidal amplitude are at all heights positive, but only partly significant.The detected trends and solar cycle dependencies are compared with other experimental results and model calculations. There is no full agreement between the different results, probably caused by different measuring techniques and evaluation methods used. Also, different heights and observation periods investigated may contribute to the detected differences.

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Section: Influence Of the 11-year Solar Cyclesupporting

confidence: 91%

Section: Influence Of the 11-year Solar Cyclesupporting

confidence: 68%

Section: Influence Of the 11-year Solar Cyclesupporting

confidence: 62%

Section: Influence Of the 11-year Solar Cyclementioning

confidence: 69%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Long-term variations of the mesospheric wind field at mid-latitudes

Keuer¹,

Hoffmann²,

Singer³

et al. 2007

Ann. Geophys.

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Geomagnetic lunar and solar daily variations during the last 100 years

Yamazaki

Kosch

2014

JGR Space Physics

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This paper describes long-term changes in the geomagnetic lunar (L) and solar (S) daily variations. We analyze the eastward component of the geomagnetic field observed at eight midlatitude stations during 1903-2012. The amplitude and phase for the semidiurnal component of the L and S variations are examined. Both L and S amplitudes correlate with the solar activity index F 10.7 , revealing a prominent 11 year solar cycle. In both cases, the correlation is slightly better with √ F 10.7 than F 10.7 . The sensitivity of the L variation to solar activity is comparable with that of the S variation. The solar cycle effect is also found in the phase of the S variation but not apparent in the phase of the L variation. The ratio in the amplitude of the L to S variation shows a long-term decrease (approximately 10% per century), which may be due to a reduction in lunar tidal waves from the lower atmosphere to the upper atmosphere in association with climate change.

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