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The main section explains the 12 hour component of atmoshperic thermal tides by stating that a fundamental with 24hr period is a squarewave and is rich in harmonics. This, it is said, creates a 2nd harmonic with a period of 12hrs. However, most schoolboys know that a square wave has odd harmonics only, so this cannot be a valid explanation for a component at 12hrs. Moreover, this reference describes a 12hr period only:-
http://weather.mailasail.com/Franks-Weather/Atmospheric-Tides
with no mention of a 24hr component. Could comeone clarify this, and remove the reference to the 2nd harmonic of a squarewave, which is obvious nonsense that almost anyone will recognise as such. -- 82.32.49.157 ( talk) 18:35, 13 March 2011 (UTC)
Agreed: a square wave representation of the day-night cycle of solar heating would have no semidiurnal (twice a day) harmonic, or any other odd harmonics. I think this mistake could be fixed by simply replacing "square wave" with "rectified sine wave" in the text. A rectified sine wave is a better approximating to the solar heating function than a square wave, and it has both odd and even harmonics. Of course the text should also note that the diurnal (once a day) harmonic is the primary component of the forcing. 128.115.184.106 ( talk) 21:44, 30 December 2013 (UTC)Curt Covey, PCMDI / LLNL
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A diagram showing the Earth from the side and how the shape of the atmosphere varies would be very helpful. -- Beland ( talk) 19:00, 12 September 2019 (UTC)
The current article text contains:
"The fundamental solar diurnal tidal mode which optimally matches the solar heat input configuration and thus is most strongly excited is the
Hough mode (1, −2) (Figure 3). It depends on
local time and travels westward with the Sun. It is an external mode of class 2 and has the eigenvalue of ε 1
−2 = −12.56. Its maximum pressure amplitude on the ground is about 60 hPa.
[1] The largest solar semidiurnal wave is mode (2, 2) with maximum pressure amplitudes at the ground of 120 hPa. It is an internal class 1 wave. Its amplitude increases exponentially with altitude. Although its solar excitation is half of that of mode (1, −2), its amplitude on the ground is larger by a factor of two. This indicates the effect of suppression of external waves, in this case by a factor of four.
[2]"
I have no access to the source mentioned.
Therefore, and since 100 hPa is equivalent to no less than approximately 10% of the average atmospheric pressure at sea level of around 1,013.25 hPa (only the strongest hurricanes reach surface pressures less than 900 hPa), I wonder if the amplitudes 60 hPa and 120 hPa mentioned in the article are actually meant as 60 Pa and 120 Pa. Redav ( talk) 01:47, 22 March 2022 (UTC)
This article is rated Start-class on Wikipedia's
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The main section explains the 12 hour component of atmoshperic thermal tides by stating that a fundamental with 24hr period is a squarewave and is rich in harmonics. This, it is said, creates a 2nd harmonic with a period of 12hrs. However, most schoolboys know that a square wave has odd harmonics only, so this cannot be a valid explanation for a component at 12hrs. Moreover, this reference describes a 12hr period only:-
http://weather.mailasail.com/Franks-Weather/Atmospheric-Tides
with no mention of a 24hr component. Could comeone clarify this, and remove the reference to the 2nd harmonic of a squarewave, which is obvious nonsense that almost anyone will recognise as such. -- 82.32.49.157 ( talk) 18:35, 13 March 2011 (UTC)
Agreed: a square wave representation of the day-night cycle of solar heating would have no semidiurnal (twice a day) harmonic, or any other odd harmonics. I think this mistake could be fixed by simply replacing "square wave" with "rectified sine wave" in the text. A rectified sine wave is a better approximating to the solar heating function than a square wave, and it has both odd and even harmonics. Of course the text should also note that the diurnal (once a day) harmonic is the primary component of the forcing. 128.115.184.106 ( talk) 21:44, 30 December 2013 (UTC)Curt Covey, PCMDI / LLNL
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Cheers.— InternetArchiveBot ( Report bug) 00:16, 21 October 2016 (UTC)
It is requested that a physics diagram or diagrams be
included in this article to
improve its quality. Specific illustrations, plots or diagrams can be requested at the
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A diagram showing the Earth from the side and how the shape of the atmosphere varies would be very helpful. -- Beland ( talk) 19:00, 12 September 2019 (UTC)
The current article text contains:
"The fundamental solar diurnal tidal mode which optimally matches the solar heat input configuration and thus is most strongly excited is the
Hough mode (1, −2) (Figure 3). It depends on
local time and travels westward with the Sun. It is an external mode of class 2 and has the eigenvalue of ε 1
−2 = −12.56. Its maximum pressure amplitude on the ground is about 60 hPa.
[1] The largest solar semidiurnal wave is mode (2, 2) with maximum pressure amplitudes at the ground of 120 hPa. It is an internal class 1 wave. Its amplitude increases exponentially with altitude. Although its solar excitation is half of that of mode (1, −2), its amplitude on the ground is larger by a factor of two. This indicates the effect of suppression of external waves, in this case by a factor of four.
[2]"
I have no access to the source mentioned.
Therefore, and since 100 hPa is equivalent to no less than approximately 10% of the average atmospheric pressure at sea level of around 1,013.25 hPa (only the strongest hurricanes reach surface pressures less than 900 hPa), I wonder if the amplitudes 60 hPa and 120 hPa mentioned in the article are actually meant as 60 Pa and 120 Pa. Redav ( talk) 01:47, 22 March 2022 (UTC)