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The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars
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| Zeitschriftentitel: | Annales Geophysicae |
|---|---|
| Personen und Körperschaften: | , |
| In: | Annales Geophysicae, 25, 2007, 8, S. 1767-1778 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Copernicus GmbH
|
| Schlagwörter: |
| author_facet |
Malinga, S. B. Ruohoniemi, J. M. Malinga, S. B. Ruohoniemi, J. M. |
|---|---|
| author |
Malinga, S. B. Ruohoniemi, J. M. |
| spellingShingle |
Malinga, S. B. Ruohoniemi, J. M. Annales Geophysicae The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics |
| author_sort |
malinga, s. b. |
| spelling |
Malinga, S. B. Ruohoniemi, J. M. 1432-0576 Copernicus GmbH Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics http://dx.doi.org/10.5194/angeo-25-1767-2007 <jats:p>Abstract. Data from the Super Dual Radar Network (SuperDARN) radars for 2002 were used to study the behaviour of the quasi-two-day wave (QTDW) in the Northern Hemisphere auroral zone. The period of the QTDW is observed to vary in the range of ~42–56 h, with the most dominant period being ~48 h and secondary peaks at ~42- and ~52-h. The spectral power shows a seasonal variation with a peak power (max~70) in summer. The power shows variations of several days and there is also evidence of changes in wave strength with longitude. The 42-h and the 48-h components tend to be strongly correlated in summer. The onset of enhanced wave activity tends to coincide with the westward acceleration of the zonal mean flow and occurs at a time of strong southward meridional flow. The most frequent instantaneous hourly period is in the 40 to 50 h period band, in line with the simultaneous dominance of the 42-h and the 48-h components. The wave numbers are less variable and are around −2 to −4 during times of strong wave activity. For a period of ~48 h, the zonal wave number is about −3 to −4, using a negative value to indicate westward propagating waves. The 42-h and the 52-h components cover a wider band in the −4 to 1 range. The wide zonal wave number spectrum in our results may account for the observed longitudinal variation in the spectral power of the wave. </jats:p> The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars Annales Geophysicae |
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| title |
The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_unstemmed |
The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_full |
The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_fullStr |
The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_full_unstemmed |
The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_short |
The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_sort |
the quasi-two-day wave studied using the northern hemisphere superdarn hf radars |
| topic |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics |
| url |
http://dx.doi.org/10.5194/angeo-25-1767-2007 |
| publishDate |
2007 |
| physical |
1767-1778 |
| description |
<jats:p>Abstract. Data from the Super Dual Radar Network (SuperDARN) radars for 2002 were used to study the behaviour of the quasi-two-day wave (QTDW) in the Northern Hemisphere auroral zone. The period of the QTDW is observed to vary in the range of ~42–56 h, with the most dominant period being ~48 h and secondary peaks at ~42- and ~52-h. The spectral power shows a seasonal variation with a peak power (max~70) in summer. The power shows variations of several days and there is also evidence of changes in wave strength with longitude. The 42-h and the 48-h components tend to be strongly correlated in summer. The onset of enhanced wave activity tends to coincide with the westward acceleration of the zonal mean flow and occurs at a time of strong southward meridional flow. The most frequent instantaneous hourly period is in the 40 to 50 h period band, in line with the simultaneous dominance of the 42-h and the 48-h components. The wave numbers are less variable and are around −2 to −4 during times of strong wave activity. For a period of ~48 h, the zonal wave number is about −3 to −4, using a negative value to indicate westward propagating waves. The 42-h and the 52-h components cover a wider band in the −4 to 1 range. The wide zonal wave number spectrum in our results may account for the observed longitudinal variation in the spectral power of the wave.
</jats:p> |
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| author | Malinga, S. B., Ruohoniemi, J. M. |
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| description | <jats:p>Abstract. Data from the Super Dual Radar Network (SuperDARN) radars for 2002 were used to study the behaviour of the quasi-two-day wave (QTDW) in the Northern Hemisphere auroral zone. The period of the QTDW is observed to vary in the range of ~42–56 h, with the most dominant period being ~48 h and secondary peaks at ~42- and ~52-h. The spectral power shows a seasonal variation with a peak power (max~70) in summer. The power shows variations of several days and there is also evidence of changes in wave strength with longitude. The 42-h and the 48-h components tend to be strongly correlated in summer. The onset of enhanced wave activity tends to coincide with the westward acceleration of the zonal mean flow and occurs at a time of strong southward meridional flow. The most frequent instantaneous hourly period is in the 40 to 50 h period band, in line with the simultaneous dominance of the 42-h and the 48-h components. The wave numbers are less variable and are around −2 to −4 during times of strong wave activity. For a period of ~48 h, the zonal wave number is about −3 to −4, using a negative value to indicate westward propagating waves. The 42-h and the 52-h components cover a wider band in the −4 to 1 range. The wide zonal wave number spectrum in our results may account for the observed longitudinal variation in the spectral power of the wave. </jats:p> |
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| institution | DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Zi4, DE-Gla1, DE-15, DE-Pl11, DE-Rs1, DE-14, DE-105 |
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| spelling | Malinga, S. B. Ruohoniemi, J. M. 1432-0576 Copernicus GmbH Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geology Astronomy and Astrophysics http://dx.doi.org/10.5194/angeo-25-1767-2007 <jats:p>Abstract. Data from the Super Dual Radar Network (SuperDARN) radars for 2002 were used to study the behaviour of the quasi-two-day wave (QTDW) in the Northern Hemisphere auroral zone. The period of the QTDW is observed to vary in the range of ~42–56 h, with the most dominant period being ~48 h and secondary peaks at ~42- and ~52-h. The spectral power shows a seasonal variation with a peak power (max~70) in summer. The power shows variations of several days and there is also evidence of changes in wave strength with longitude. The 42-h and the 48-h components tend to be strongly correlated in summer. The onset of enhanced wave activity tends to coincide with the westward acceleration of the zonal mean flow and occurs at a time of strong southward meridional flow. The most frequent instantaneous hourly period is in the 40 to 50 h period band, in line with the simultaneous dominance of the 42-h and the 48-h components. The wave numbers are less variable and are around −2 to −4 during times of strong wave activity. For a period of ~48 h, the zonal wave number is about −3 to −4, using a negative value to indicate westward propagating waves. The 42-h and the 52-h components cover a wider band in the −4 to 1 range. The wide zonal wave number spectrum in our results may account for the observed longitudinal variation in the spectral power of the wave. </jats:p> The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars Annales Geophysicae |
| spellingShingle | Malinga, S. B., Ruohoniemi, J. M., Annales Geophysicae, The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geology, Astronomy and Astrophysics |
| title | The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_full | The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_fullStr | The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_full_unstemmed | The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_short | The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| title_sort | the quasi-two-day wave studied using the northern hemisphere superdarn hf radars |
| title_unstemmed | The quasi-two-day wave studied using the Northern Hemisphere SuperDARN HF radars |
| topic | Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geology, Astronomy and Astrophysics |
| url | http://dx.doi.org/10.5194/angeo-25-1767-2007 |