Some characteristics of atmospheric gravity waves observed by radio-interferometry
Observations of atmospheric acoustic-gravity waves (AGWs) are considered through their effect on the horizontal gradient <b>G</b> of the slant total electron content (slant TEC), which can be directly obtained from two-dimensional radio-interferometric observations of cosmic radio-sou...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
1996-01-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/14/42/1996/angeo-14-42-1996.pdf |
| _version_ | 1818057710942289920 |
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| author | C. Mercier |
| author_facet | C. Mercier |
| author_sort | C. Mercier |
| collection | DOAJ |
| description | Observations of atmospheric acoustic-gravity
waves (AGWs) are considered through their effect on the horizontal gradient <b>G</b>
of the slant total electron content (slant TEC), which can be directly obtained
from two-dimensional radio-interferometric observations of cosmic radio-sources
with the Nançay radioheligraph (2.2<sup>°</sup>E, 47.3<sup>°</sup>N).
Azimuths of propagation can be deduced (modulo 180<sup>°</sup>). The total
database amounts to about 800 h of observations at various elevations, local
time and seasons. The main results are:
<p style="line-height: 20px;">a) AGWs are partially directive, confirming our previous
results.
<p style="line-height: 20px;">b) The propagation azimuths considered globally are widely
scattered with a preference towards the south.
<p style="line-height: 20px;">c) They show a bimodal time distribution with preferential
directions towards the SE during daytime and towards the SW during night-time
(rather than a clockwise rotation as reported by previous authors).
<p style="line-height: 20px;">d) The periods are scattered but are larger during night-time
than during daytime by about 60%.
<p style="line-height: 20px;">e) The effects observed with the solar radio-sources are
significantly stronger than with other radio-sources (particularly at higher
elevations), showing the role of the geometry in line of sight-integrated
observations. |
| first_indexed | 2024-12-10T12:49:04Z |
| format | Article |
| id | doaj.art-6f12f48f6b024d76b77a1892e1d666a3 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-10T12:49:04Z |
| publishDate | 1996-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-6f12f48f6b024d76b77a1892e1d666a32022-12-22T01:48:19ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761996-01-0114425810.1007/s00585-996-0042-6Some characteristics of atmospheric gravity waves observed by radio-interferometryC. MercierObservations of atmospheric acoustic-gravity waves (AGWs) are considered through their effect on the horizontal gradient <b>G</b> of the slant total electron content (slant TEC), which can be directly obtained from two-dimensional radio-interferometric observations of cosmic radio-sources with the Nançay radioheligraph (2.2<sup>°</sup>E, 47.3<sup>°</sup>N). Azimuths of propagation can be deduced (modulo 180<sup>°</sup>). The total database amounts to about 800 h of observations at various elevations, local time and seasons. The main results are: <p style="line-height: 20px;">a) AGWs are partially directive, confirming our previous results. <p style="line-height: 20px;">b) The propagation azimuths considered globally are widely scattered with a preference towards the south. <p style="line-height: 20px;">c) They show a bimodal time distribution with preferential directions towards the SE during daytime and towards the SW during night-time (rather than a clockwise rotation as reported by previous authors). <p style="line-height: 20px;">d) The periods are scattered but are larger during night-time than during daytime by about 60%. <p style="line-height: 20px;">e) The effects observed with the solar radio-sources are significantly stronger than with other radio-sources (particularly at higher elevations), showing the role of the geometry in line of sight-integrated observations.https://www.ann-geophys.net/14/42/1996/angeo-14-42-1996.pdf |
| spellingShingle | C. Mercier Some characteristics of atmospheric gravity waves observed by radio-interferometry Annales Geophysicae |
| title | Some characteristics of atmospheric gravity waves observed by radio-interferometry |
| title_full | Some characteristics of atmospheric gravity waves observed by radio-interferometry |
| title_fullStr | Some characteristics of atmospheric gravity waves observed by radio-interferometry |
| title_full_unstemmed | Some characteristics of atmospheric gravity waves observed by radio-interferometry |
| title_short | Some characteristics of atmospheric gravity waves observed by radio-interferometry |
| title_sort | some characteristics of atmospheric gravity waves observed by radio interferometry |
| url | https://www.ann-geophys.net/14/42/1996/angeo-14-42-1996.pdf |
| work_keys_str_mv | AT cmercier somecharacteristicsofatmosphericgravitywavesobservedbyradiointerferometry |