The 8-h tide in the mesosphere and lower thermosphere over Collm (51.3° N; 13.0° E), 2004–2011
The horizontal winds in the mesosphere and lower thermosphere (MLT) at heights of about 80–100 km have been measured continuously since summer 2004 using an all-sky 36.2 MHz VHF meteor radar at Collm, Germany (51.3° N, 13° E). A climatology of the 8-h solar tide has been constructed from these data....
| Main Authors: | , |
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| Format: | Article |
| Language: | deu |
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Copernicus Publications
2012-09-01
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| Series: | Advances in Radio Science |
| Online Access: | http://www.adv-radio-sci.net/10/265/2012/ars-10-265-2012.pdf |
| _version_ | 1819030742012788736 |
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| author | Ch. Jacobi T. Fytterer |
| author_facet | Ch. Jacobi T. Fytterer |
| author_sort | Ch. Jacobi |
| collection | DOAJ |
| description | The horizontal winds in the mesosphere and lower thermosphere (MLT) at
heights of about 80–100 km have been measured continuously since summer 2004
using an all-sky 36.2 MHz VHF meteor radar at Collm, Germany (51.3° N,
13° E). A climatology of the 8-h solar tide has been constructed from
these data. The amplitude shows a seasonal behaviour with maximum values
during the equinoxes, and it is generally increasing with altitude. The
largest amplitudes are measured in autumn, partly reaching values up to 15 m s<sup>−1</sup>.
The phase, defined as the time of maximum eastward or northward wind,
respectively, has earlier values in winter and later ones in summer. Except
for summer, the phase difference between the zonal and meridional components
is close to +2 h, indicating circular polarization of the tidal components.
The vertical wavelengths are short in summer (~20 km) but
significantly longer during the rest of the year. The terdiurnal tide is
generally assumed to originate from either a terdiurnal component of solar
heating or nonlinear interaction between the diurnal and semidiurnal tide.
Analysing monthly means reveals positive correlation during the spring
maximum, but negative correlation in autumn. |
| first_indexed | 2024-12-21T06:34:59Z |
| format | Article |
| id | doaj.art-50db3d1a12d8454ab919a756bcedeea2 |
| institution | Directory Open Access Journal |
| issn | 1684-9965 1684-9973 |
| language | deu |
| last_indexed | 2024-12-21T06:34:59Z |
| publishDate | 2012-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Advances in Radio Science |
| spelling | doaj.art-50db3d1a12d8454ab919a756bcedeea22022-12-21T19:12:54ZdeuCopernicus PublicationsAdvances in Radio Science1684-99651684-99732012-09-011026527010.5194/ars-10-265-2012The 8-h tide in the mesosphere and lower thermosphere over Collm (51.3° N; 13.0° E), 2004–2011Ch. Jacobi0T. Fytterer1Institute for Meteorology, University of Leipzig, Stephanstr. 3, 04103 Leipzig, GermanyInstitute for Meteorology, University of Leipzig, Stephanstr. 3, 04103 Leipzig, GermanyThe horizontal winds in the mesosphere and lower thermosphere (MLT) at heights of about 80–100 km have been measured continuously since summer 2004 using an all-sky 36.2 MHz VHF meteor radar at Collm, Germany (51.3° N, 13° E). A climatology of the 8-h solar tide has been constructed from these data. The amplitude shows a seasonal behaviour with maximum values during the equinoxes, and it is generally increasing with altitude. The largest amplitudes are measured in autumn, partly reaching values up to 15 m s<sup>−1</sup>. The phase, defined as the time of maximum eastward or northward wind, respectively, has earlier values in winter and later ones in summer. Except for summer, the phase difference between the zonal and meridional components is close to +2 h, indicating circular polarization of the tidal components. The vertical wavelengths are short in summer (~20 km) but significantly longer during the rest of the year. The terdiurnal tide is generally assumed to originate from either a terdiurnal component of solar heating or nonlinear interaction between the diurnal and semidiurnal tide. Analysing monthly means reveals positive correlation during the spring maximum, but negative correlation in autumn.http://www.adv-radio-sci.net/10/265/2012/ars-10-265-2012.pdf |
| spellingShingle | Ch. Jacobi T. Fytterer The 8-h tide in the mesosphere and lower thermosphere over Collm (51.3° N; 13.0° E), 2004–2011 Advances in Radio Science |
| title | The 8-h tide in the mesosphere and lower thermosphere over Collm (51.3° N; 13.0° E), 2004–2011 |
| title_full | The 8-h tide in the mesosphere and lower thermosphere over Collm (51.3° N; 13.0° E), 2004–2011 |
| title_fullStr | The 8-h tide in the mesosphere and lower thermosphere over Collm (51.3° N; 13.0° E), 2004–2011 |
| title_full_unstemmed | The 8-h tide in the mesosphere and lower thermosphere over Collm (51.3° N; 13.0° E), 2004–2011 |
| title_short | The 8-h tide in the mesosphere and lower thermosphere over Collm (51.3° N; 13.0° E), 2004–2011 |
| title_sort | 8 h tide in the mesosphere and lower thermosphere over collm 51 3° n 13 0° e 2004 2011 |
| url | http://www.adv-radio-sci.net/10/265/2012/ars-10-265-2012.pdf |
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