Meridional thermospheric winds over the Antarctic Peninsula longitude sector

Foppiano, A. J.; Torres, X.A.; Arriagada, M.A; Flores, Paulo A. C.

doi:10.1016/s1364-6826(02)00287-0

Cited by 10 publications

(18 citation statements)

References 17 publications

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“…An inverse relationship between the VEWs and the solar activity is evident during both daytime and nighttime, similar to the results over Wuhan (Liu et al, 2003c) while different from the meridional winds predicted by the HWM model (Hagan, 1993;Buonsanto and Witasse, 1999). However, the latitudinal trend of VEWs is significantly dependent on season, and relatively less dependent on local time and solar activity.…”

Section: The Local Time and Solar Activity Variationsupporting

confidence: 68%

“…The meridional winds at mid-latitude are consistent with the solar EUV forcing and the consequent latitudinal pressure gradients, namely poleward by day and equatorward at night (Hagan, 1993;Kawamura et al, 2000). At higher mid-latitudes, the meridional winds can be influenced by the aurorally driven high-latitude circulation cell even under quiet conditions (Hagan, 1993;Emmert et al, 2003).…”

Section: Introductionsupporting

confidence: 66%

“…A significant feature of equatorial electric field drifts is the pre-reversal enhancement during solar maximum years, while this enhancement is either greatly reduced or completely absent during solar minimum years (Scherliess and Fejer, 1999). The meridional winds at mid-latitude are consistent with the solar EUV forcing and the consequent latitudinal pressure gradients, namely poleward by day and equatorward at night (Hagan, 1993;Kawamura et al, 2000). At higher mid-latitudes, the meridional winds can be influenced by the aurorally driven high-latitude circulation cell even under quiet conditions (Hagan, 1993;Emmert et al, 2003).…”

Section: Introductionmentioning

confidence: 68%

“…Buonsanto, 1990;Hagan, 1993;Biondi et al, 1999;Igi et al, 1999;Buonsanto and Witasse, 1999;Kawamura et al, 2000;Emmert et al, 2003;Foppiano et al, 2003). Up to now, some climatological models of the thermospheric horizontal winds (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Detailed latitudinal trends of meridional winds are involved in the above climatological works (e.g. Biondi et al, 1999;Emmert et al, 2003;Foppiano et al, 2003) and other investigations (Salah et al, 1987;Oliver et al, 1988;Wickwar, 1989;Miller et al, 1993;Zhang et al, 1995). Miller et al (1997) have presented climatology of the F-layer meridional equivalent winds at various stations.…”

Section: Introductionmentioning

confidence: 99%

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A climatology of the F-layer equivalent winds derived from ionosonde measurements over two decades along the 120°-150°E sector

et al. 2004

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Abstract. The vertical equivalent winds (VEWs) at the F-layer are analyzed along the 120 • -150 • E longitude sector with an emphasis on their latitudinal dependence. The VEWs are derived from the monthly median data of fourteen ionosonde stations over two decades. The results show that the VEWs have considerable dependences on the magnetic latitude with an approximate symmetry about the magnetic equator. They are mostly controlled by the electric field drifts in the magnetic equatorial region, and shift to be mostly contributed by neutral winds at mid-latitudes. The relative contribution of the two dynamic factors is regulated by the magnetic dip in addition to their own magnitudes. The VEWs generally have opposite directions and different magnitudes between lower and higher latitudes. At solar minimum, the magnitudes of VEWs are only between −20 and 20 m/s at lower latitudes, while at higher latitudes they tend to increase with latitudes, typically having magnitudes between 20-40 m/s. At solar maximum, the VEWs are reduced by about 10-20 m/s in magnitudes during some local times at higher latitudes. A tidal analysis reveals that the relative importance of major tidal components is also different between lower and higher latitudes.The VEWs also depend on local time, season and solar activity. At higher latitudes, the nighttime VEWs have larger magnitude during post-midnight hours and so do the daytime ones before midday. The VEWs tend to have an inverse relationship with solar activity not only at night, but also by day, which is different from the meridional winds predicted by the HWM93 model. The latitudinal dependence of VEWs has two prevailing trends: one is a maximum at the highest latitudes (as far as the latitudes concerned in the present work); the other is a mid-latitude maximum. These two latitudinal trends are mostly dependent on season, while they depend relatively weakly on local time and solar activity. The latitudinal gradients of VEWs also show a tendency of a midCorrespondence to: L. Liu (liul@mail.igcas.ac.cn) latitude maximum, except that there are much stronger latitudinal gradients at southern higher mid-latitudes in some seasons. The gradients during daytime are much smaller at solar maximum than minimum, whereas they are generally comparable at night under both solar activity levels.

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Section: The Local Time and Solar Activity Variationsupporting

confidence: 68%

Section: Introductionsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A climatology of the F-layer equivalent winds derived from ionosonde measurements over two decades along the 120°-150°E sector

et al. 2004

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A preliminary study of thermosphere and mesosphere wind observed by Fabry‐Perot over Kelan, China

Huang

Zhao

et al. 2014

JGR Space Physics

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A Fabry-Perot interferometer (FPI) system was deployed in Kelan (38.7°N, 111.6°E), center China in November 2011, which observes the airglows at wavelengths of 892.0 nm, 557.7 nm, and 630.0 nm from OH and OI emissions in the upper atmosphere, to derive the wind and temperature at heights around 87 km, 97 km, and 250 km, respectively. From late 2011 through 2013 a series of more than 4500 measurements at each height are validated according to manufacture data quality criteria. By using these data, the morphology of wind in the mesosphere and thermosphere is investigated in this study. Preliminary results are as follows:(1) As for the diurnal variation, meridional and zonal winds at heights of 87 km and 97 km, which are derived through 892.0 nm and 557.7 nm airglows, usually range from À50 m/s to 30 m/s and À50 m/s to 50 m/s, respectively, with typical random errors of about 6-10 m/s at 87 km and 2-3 m/s at 97 km. Meridional winds usually are northward at dusk, southward at middle night, and back to northward at dawn; and zonal winds usually are eastward at dusk, westward at middle night, and back to eastward at dawn. The monthly mean winds are in good agreement with those of HWM93 results. Meridional and zonal winds at a height of 250 km, which are derived through 630.0 nm nightglow, range from À110 m/s to 80 m/s with typical random errors of about 8-10 m/s. Meridional winds usually are northward at dusk, southward at middle night, and back to northward at dawn; and zonal winds usually are eastward at dusk, zero at middle night, and westward at dawn; and they are also well consistent with HWM93 results. (2) As for the seasonal variation, meridional winds at the heights of 87 km and 97 km have a visible annual variation at 12-17 LT and with a little semiannual variation at all other hours, but the zonal winds at the heights of 87 km and 97 km have a semiannual variation all night. The seasonal dependence of the winds, both meridional and zonal winds, at the height of 250 km is generally annual, but isolated cases of semiannual variation are observed. (3) The horizontal winds at 250 km evidently respond to the two storms of July 2012, apparent enhancement of the velocity of the southwestward wind. But no other obvious storm effects can be found from the winds at 87 km and 97 km during the same period.

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Thermospheric Meridional Wind Control on Equatorial Scintillations and the Role of the Evening F-Region Height Rise, E × B Drift Velocities and F2-Peak Density Gradients

et al. 2010

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The possible role, on L-band scintillation activity, played by the nighttime magnetic meridional component of the thermospheric horizontal neutral winds, the postsunset F-layer base height, the electrical field pre-reversal enhancement (PRE) and the latitudinal gradients of the F2-layer peak density is analyzed, considering different cases of scintillation occurrence (and their latitudinal extent) during August and September 2002. The meridional winds were derived over low-latitudes from a modified form of the nonlinear time-dependent servo-model. A chain of two scintillation monitors and three digital ionosondes was operational in Brazil and used to collect, respectively, global positioning system signal amplitude scintillation and ionospheric height (h 0 F; hpF2) and frequency (foF2) parameters. From the overall behavior in the 2 months analyzed, the results suggest that high near sunset upward vertical plasma drifts are conducive for the generation of spread-F irregularities, whereas large poleward meridional winds tend to suppress the development of plasma bubble irregularities and the occurrence of their associated scintillations. Even when generated, a reduced fountain effect, due to weak electric field PRE, acts for the bubbles to be expanded less effectively to higher latitudes. The results also reveal that high F-layer base and peak heights (at equatorial and off-equatorial latitudes), and intense gradients in the F2-peak density between the dip equator and the equatorial anomaly crests, are favorable conditions for the generation of F-region irregularities and increased scintillation activity. Other distinct features of the controlling factors in the cases of occurrence and non-occurrence of equatorial scintillations are presented and discussed.

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Meridional thermospheric winds over the Antarctic Peninsula longitude sector

Cited by 10 publications

References 17 publications

A climatology of the F-layer equivalent winds derived from ionosonde measurements over two decades along the 120°-150°E sector

A climatology of the F-layer equivalent winds derived from ionosonde measurements over two decades along the 120°-150°E sector

A preliminary study of thermosphere and mesosphere wind observed by Fabry‐Perot over Kelan, China

Thermospheric Meridional Wind Control on Equatorial Scintillations and the Role of the Evening F-Region Height Rise, E × B Drift Velocities and F2-Peak Density Gradients

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