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In fluid dynamics, the Brunt-Väisälä frequency is the frequency of vertical inertial oscillations in a stably stratified fluid. (Väisälä obtained this result in 1925 and the English meteorologist Sir David Brunt derived the same result independently in 1927.) However, another source has the co-discoverer of this result as "Vilho Väisälä (1889 – 1969), who was a meteorologist and the inventor of the radiosonde and the founder of Vaisala Group [1].
Although one online source identifies the "Vaisala" of the Brunt-Vaisala frequency with Yrjo Vaisala the astronomer, others call him Vilho Vaisala or even Yuri Vaisala and give different years of birth and death. Since Vilho Vaisala was a meteorologist (short bio at http://www.vaisala.com/ ), it seems more likely that he was the person in question rather than Yrjo Vaisala. Apparently Vaisala is not an uncommon last name in Finland.
Oops, sorry. Thanks for the correction. --Trainspotter 15:20, 17 May 2004 (UTC)[reply]
Yes it is uncommon. Väisälä, however, is much more common. JIP | Talk 13:03, 30 April 2006 (UTC)[reply]
Can someone with original sources confirm and add this to Geodesy section?[edit]
The following appears in the Stellar triangulation article but these details to not appear in this main Yrjö Väisälä article. If they can be sourced, and confirmed, it may be helpful to add this to the Geodesy section (but only if it is sourced):
[In the discipline of space geodesy stars were first used to measure Earth's geometric shape] by the Finnish astronomer Yrjö Väisälä in 1959 who made astrometric photographs of the night sky at two stations together with a lighted balloon probe between them. Even this first step showed the potential of the method, as Väisälä got the azimuth between Helsinki and Turku (a distance of 150 km) with an accuracy of 1″. Soon the method was successfully tested by ballistic rockets and for some special satellites. Bob Enyart, Denver KGOV radio host (talk) 16:23, 10 July 2021 (UTC)[reply]
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