On the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurements
At the Collm Observatory of the University of Leipzig LF D1 low-frequency total reflection night-time wind measurements have been carried out continuously for more than two decades. Using a multiple regression analysis to derive prevailing winds, tides and the quasi-2-day wave from the half-hour...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
1998-12-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/16/1534/1998/angeo-16-1534-1998.pdf |
| _version_ | 1818596709062672384 |
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| author | C. Jacobi C. Jacobi |
| author_facet | C. Jacobi C. Jacobi |
| author_sort | C. Jacobi |
| collection | DOAJ |
| description | At the Collm Observatory of the University of
Leipzig LF D1 low-frequency total reflection night-time wind measurements have
been carried out continuously for more than two decades. Using a multiple
regression analysis to derive prevailing winds, tides and the quasi-2-day wave
from the half-hourly mean values of the horizontal wind components, monthly mean
values of mesopause wind parameters are obtained that can be analysed with
respect to long-term trends and influences of solar variability. The response of
the prevailing wind to the 11-year solar cycle differs throughout the year.
While in winter no significant correlation between the zonal prevailing wind and
solar activity is found, in spring and summer a negative correlation between the
TWC can be seen from the measurements. This is connected with stronger vertical
gradients of the zonal prevailing wind during solar maximum than during solar
minimum. Since the amplitude of the quasi-2-day wave is dependent on the zonal
mean wind vertical gradient, this is connected with a positive correlation
between solar activity and quasi-two-day wave activity.<br><br><b>Key words.</b> Meteorology and atmospheric dynamics ·
Middle atmosphere dynamics Multiple regression analysis Quasi-2-day wave</p> |
| first_indexed | 2024-12-16T11:36:13Z |
| format | Article |
| id | doaj.art-84a3202112c34989983d53f3286cbf56 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-16T11:36:13Z |
| publishDate | 1998-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-84a3202112c34989983d53f3286cbf562022-12-21T22:33:06ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761998-12-01161534154310.1007/s00585-998-1534-3On the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurementsC. Jacobi0C. Jacobi1Fax: +49341221 0937; e-mail: jacobi@rz.uni-leipzig.deInstitute for Meteorology, University of Leipzig, Stephanstr. 3, D-04103 Leipzig, GermanyAt the Collm Observatory of the University of Leipzig LF D1 low-frequency total reflection night-time wind measurements have been carried out continuously for more than two decades. Using a multiple regression analysis to derive prevailing winds, tides and the quasi-2-day wave from the half-hourly mean values of the horizontal wind components, monthly mean values of mesopause wind parameters are obtained that can be analysed with respect to long-term trends and influences of solar variability. The response of the prevailing wind to the 11-year solar cycle differs throughout the year. While in winter no significant correlation between the zonal prevailing wind and solar activity is found, in spring and summer a negative correlation between the TWC can be seen from the measurements. This is connected with stronger vertical gradients of the zonal prevailing wind during solar maximum than during solar minimum. Since the amplitude of the quasi-2-day wave is dependent on the zonal mean wind vertical gradient, this is connected with a positive correlation between solar activity and quasi-two-day wave activity.<br><br><b>Key words.</b> Meteorology and atmospheric dynamics · Middle atmosphere dynamics Multiple regression analysis Quasi-2-day wave</p>https://www.ann-geophys.net/16/1534/1998/angeo-16-1534-1998.pdf |
| spellingShingle | C. Jacobi C. Jacobi On the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurements Annales Geophysicae |
| title | On the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurements |
| title_full | On the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurements |
| title_fullStr | On the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurements |
| title_full_unstemmed | On the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurements |
| title_short | On the solar cycle dependence of winds and planetary waves as seen from mid-latitude D1 LF mesopause region wind measurements |
| title_sort | on the solar cycle dependence of winds and planetary waves as seen from mid latitude d1 lf mesopause region wind measurements |
| url | https://www.ann-geophys.net/16/1534/1998/angeo-16-1534-1998.pdf |
| work_keys_str_mv | AT cjacobi onthesolarcycledependenceofwindsandplanetarywavesasseenfrommidlatituded1lfmesopauseregionwindmeasurements AT cjacobi onthesolarcycledependenceofwindsandplanetarywavesasseenfrommidlatituded1lfmesopauseregionwindmeasurements |