Space and time variations of large-scale air motions in the lower thermosphere

Iljichev, Yu.D; Lysenko, I. A.; Orlyansky, A. D.; Portnyagin, Yu. I.

doi:10.1016/0021-9169(74)90170-6

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…The first MLT meteor radar wind measurements in the Arctic were carried out at the Heiss Island (80.5 • N, 58 • E) for the period 1965-1985 (see Lysenko et al, 1969Lysenko et al, , 1972Lysenko et al, , 1979Iljichev et al, 1974;Portnyagin et al, 1993aPortnyagin et al, , 1993bFraser et al, 1995). The MLT wind measurements in the Arctic were also carried out between 1967-1968 at College (65 • N, 148 • W; Hook, 1970), at Kiruna (68 • N, 20 • E;1974-1975Massebeuf et al, 1979;Manson et al, 1985, 19871980-1984Avery et al, 1989;Manson et al, 1985Manson et al, , 1987, and at Tromsø (70 • N, 19 • E; Manson et al, 1985Manson et al, , 1987Manson et al, , 1991Manson et al, , 2002a. Avery et al (1989) summarized what was known about the high-latitude MLT wind climatology.…”

Section: Introductionmentioning

confidence: 99%

Monthly mean climatology of the prevailing winds and tides in the Arctic mesosphere/lower thermosphere

et al. 2004

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are discussed and compared with those observed in the midlatitudes. The network of the ground-based MF and meteor radars for measuring winds in the Arctic upper mesosphere and lower thermosphere provides an excellent opportunity for study of the main global dynamical structures in this height region and their dependence from longitude. Preliminary estimates of the differences between the measured winds and tides from the different radar types, situated 125-273 km apart (Tromsø, Andenes and Esrange), are provided. Despite some differences arising from using different types of radars it is possible to study the dynamical wind structures. It is revealed that most of the observed dynamical structures are persistent from year to year, thus permitting the analysis of the Arctic MLT dynamics in a climatological sense. The seasonal behaviour of the zonally averaged wind parameters is, to some extent, similar to that observed at the moderate latitudes. However, the strength of the winds (except the prevailing meridional wind and the diurnal tide amplitudes) in the Arctic MLT region is, in general, less than that detected at the moderate latitudes, decreasing toward the pole. There are also some features in the vertical structure and seasonal variations of the Arctic MLT winds which are different from the expectations of the well-known empirical wind models CIRA-86 and HWM-93. The tidal phases show a very definite longitudinal dependence that permits the determination of the corresponding zonal wave numbers. It is shown thatCorrespondence to: Y. I. Portnyagin (yportgin@typhoon.obninsk.org) the migrating tides play an important role in the dynamics of the Arctic MLT region. However, there are clear indications with the presence in some months of non-migrating tidal modes of significant appreciable amplitude.

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Section: Introductionmentioning

confidence: 99%

Monthly mean climatology of the prevailing winds and tides in the Arctic mesosphere/lower thermosphere

et al. 2004

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“…The Institute of Experimental Meteorology (IEM) carries out regular wind velocity measurements in the 90-100 km height region by the meteor radar at three stations (LYSENKO and ORLYANSKY, 1971, ILJICHEV et al, 1972, 1974, Heiss Island (from 1964), Obninsk (from 1964), Molodezhnaya, the Antarctica (from 1967).…”

mentioning

confidence: 99%

Results of wind velocity measurements at middle and high latitudes by the meteor radar method.

Lysenko

Orlyansky

Portnyagin

1979

J. geomagn. geoelec

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The Institute of Experimental Meteorology carries out regular wind measurements by the meteor radar at three stations, Heiss Island (from 1964), Obninsk (from 1964) and Molodezhnaya, the Antarctica (from 1967). The seasonal course of wind regime parameters in the meteor zone in different years was found to be relatively stable in comparison with site-to-site variations of these parameters.It is shown that wind velocity variations with the periods from 2-5 to 10-20 days are typical of the meteor zone and are connected with corresponding variations in stratomesosphere. The analysis of dates for different years showed that in the meteor zone the spring reversal of circulation begins much earlier in stratosphere; more earlier (later) dates of the reversal in stratosphere correspond to more earlier(later) dates of the reversal beginning in the meteor zone.

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“…In that connection, they have explained the wind observations made at Obninsk (55°N), Heiss Island (80.5°N) and Molodezhnaya (67°S) during 1964-68 in terms of periodic and prevailing components. Iljichev et al [ 14] have analyzed the wind data over Volgograd (48°N) in addition to these three stations to investigate the air motions in the lower thermosphere during geomagnetic disturbances. In order to study the relationship between the amplitude and phase of both zonal and meridional tidal wind components and the momentum flux due to these tides besides the routine synoptic variations, the data over the above three stations during the five year period i.e.…”

Section: Introductionmentioning

confidence: 99%

On the atmospheric tidal wind variations at meteor heights

Devara

Ahmed

1982

Arch. Met. Geoph. Biocl. A.

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Monthly averages of the zonal and meridional neutral wind data recorded over Obninsk (55°N), Heiss Island (80.5°N) and Molodezhnaya (67°S), using meteor radar technique, during the period 1967-71 are analyzed in detail in terms of prevailing and periodic components. Results of the geographical variation of the data reveal the presence of comparatively higher amplitudes of the wind components at Molodezhnaya station. It is observed that higher amplitudes of the semi-diurnal component are mostly associated with lower phases at all the three stations. The momentum flux due to the diurnal and semi-diurnal wind components are calculated for all the seasons at each site. The results are compared with the measurements made at other latitudinal stations. Zusammenfassung iJber atmosphiidsche Gezeitenwindiinderungen in 95 km H6heEs werden Monatsmittel der mit Radarmessungen yon Meteoritenbahnen tiber Obninsk (55°N), Heiss Island (80,5°N) und Molodeshnaya (67°S) in den Jahren 1967 bis 1971 gemessenen zonalen und meridionalen Windbeobachtungsdaten in bezug auf vorherrschende und periodische Komponenten analysiert. Aus den geographischen Unterschieden der Beobachtungsdaten ergeben sich verhiiltnism~iNg gr6gere Amplituden an der Station Molodeshnaya. Es wurde beobachtet, dag an allen drei Stationen gr6fSere Amplituden der halbtiigigen Komponente meist mit kleineren Phasen verbunden sind. Ftir alle Jahreszeiten wird for jede Station der Impulsflug zufolge der t~iglichen und halbt~igigen Windkomponente berechnet. Die Ergebnisse werden mit Messungen an Stationen in anderen Breiten verglichen.

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Space and time variations of large-scale air motions in the lower thermosphere

Cited by 9 publications

References 2 publications

Monthly mean climatology of the prevailing winds and tides in the Arctic mesosphere/lower thermosphere

Monthly mean climatology of the prevailing winds and tides in the Arctic mesosphere/lower thermosphere

Results of wind velocity measurements at middle and high latitudes by the meteor radar method.

On the atmospheric tidal wind variations at meteor heights

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