KFU. Card publication. The spectra of long-period variations in the semidiurnal tide and predominant wind at altitudes of the upper mesosphere and lower thermosphere

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THE SPECTRA OF LONG-PERIOD VARIATIONS IN THE SEMIDIURNAL TIDE AND PREDOMINANT WIND AT ALTITUDES OF THE UPPER MESOSPHERE AND LOWER THERMOSPHERE

Form of presentation

Articles in international journals and collections

Year of publication

2001

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Authors, employees of KFU

Ishmuratov Rashid Aminovich, author

Naumov Aleksey Vasilevich, author

Sidorov Vladimir Vasilevich, author

Bibliographic description in the original language

Sidorov V.V. The spectra of long-period variations in the semidiurnal tide and predominant wind at altitudes of the upper mesosphere and lower thermosphere / Sidorov V.V. , Ishmuratov R.A., Naumov A.V. // GEOMAGNETISM AND AERONOMY. - Tom: 41 Vypusk: 6 Str.: 790-798, Opublikovano: NOV-DEC 2001.

Annotation

The altitude structures of the spectrum of long-period (diurnal) variations in the tidal motions and predominant wind and of the quasi-two-day wave disturbances on time scales of two to 40 days have been determined based on data of the new cycle of radiometeor wind observations and altitude measurements in the range 80-105 km, performed in Kazan (56 degrees N, 49 degrees E) in 1998-1999 within the scope of the European collective program INTAS-96-1669. The seasonal regularities identified previously for the long data series (1986-1988) have been corroborated. The wave disturbance spectra of the semidiurnal tide amplitude are considerably different from those of the predominant wind. In winter, the semidiurnal tide modulation intensity increases with altitude. In summer, this increase is less pronounced. The dispersion values averaged in altitude are similar to 90 m(2) s(-2) in winter and 55-60 m(2) s(-2) in summer. ne correlation between the semidiurnal tide and predominant wind depends on altitude, time, season, frequency band, and wind components. On the average. the correlation values are lower than 0.5. In summer, the correlation is lower than in winter. The coherence spectrum has a less pronounced periodic structure changing with altitude. In this case, coherence increases or decreases between 0.1 and 0.7. The obtained data indicate that the spectral structure of wave disturbances between 80 and 105 km is complex, and that they are important for determining the modulation mechanisms of wave disturbances and tidal modes by larger-scale motions.

Keywords

spectra, predominant wind, upper mesosphere, lower thermosphere

The name of the journal

GEOMAGNETISM AND AERONOMY

URL

https://apps.webofknowledge.com/full_record.do?product=WOS&search_mode=AuthorFinder&qid=1&SID=E6Hj2dNP742gf7iP5zD&page=1&doc=1&cacheurlFromRightClick=no

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=203104&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Ishmuratov Rashid Aminovich	ru_RU
dc.contributor.author	Naumov Aleksey Vasilevich	ru_RU
dc.contributor.author	Sidorov Vladimir Vasilevich	ru_RU
dc.date.accessioned	2001-01-01T00:00:00Z	ru_RU
dc.date.available	2001-01-01T00:00:00Z	ru_RU
dc.date.issued	2001	ru_RU
dc.identifier.citation	Sidorov V.V. The spectra of long-period variations in the semidiurnal tide and predominant wind at altitudes of the upper mesosphere and lower thermosphere / Sidorov V.V. , Ishmuratov R.A., Naumov A.V. // GEOMAGNETISM AND AERONOMY. - ��: 41 ��: 6 ��.: 790-798, ��: NOV-DEC 2001.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=203104&p_lang=2	ru_RU
dc.description.abstract	GEOMAGNETISM AND AERONOMY	ru_RU
dc.description.abstract	The altitude structures of the spectrum of long-period (diurnal) variations in the tidal motions and predominant wind and of the quasi-two-day wave disturbances on time scales of two to 40 days have been determined based on data of the new cycle of radiometeor wind observations and altitude measurements in the range 80-105 km, performed in Kazan (56 degrees N, 49 degrees E) in 1998-1999 within the scope of the European collective program INTAS-96-1669. The seasonal regularities identified previously for the long data series (1986-1988) have been corroborated. The wave disturbance spectra of the semidiurnal tide amplitude are considerably different from those of the predominant wind. In winter, the semidiurnal tide modulation intensity increases with altitude. In summer, this increase is less pronounced. The dispersion values averaged in altitude are similar to 90 m(2) s(-2) in winter and 55-60 m(2) s(-2) in summer. ne correlation between the semidiurnal tide and predominant wind depends on altitude, time, season, frequency band, and wind components. On the average. the correlation values are lower than 0.5. In summer, the correlation is lower than in winter. The coherence spectrum has a less pronounced periodic structure changing with altitude. In this case, coherence increases or decreases between 0.1 and 0.7. The obtained data indicate that the spectral structure of wave disturbances between 80 and 105 km is complex, and that they are important for determining the modulation mechanisms of wave disturbances and tidal modes by larger-scale motions.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	spectra	ru_RU
dc.subject	predominant wind	ru_RU
dc.subject	upper mesosphere	ru_RU
dc.subject	lower thermosphere	ru_RU
dc.title	The spectra of long-period variations in the semidiurnal tide and predominant wind at altitudes of the upper mesosphere and lower thermosphere	ru_RU
dc.type	Articles in international journals and collections	ru_RU