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Finnish technology company making measuring instruments
Vaisala Oyj (Finnish pronunciation: [ˈʋɑi̯sɑlɑ]) is a Finnish company that produces products and services for environmental and industrial measurement
Vaisala
Finnish astronomer (1891–1971)
Yrjö Väisälä (Finnish: [ˈyrjø ˈʋæi̯sælæ] ; 6 September 1891 – 21 July 1971) was a Finnish astronomer and physicist. His main contributions were in the
Yrjö_Väisälä
Index of articles associated with the same name
Comet Väisälä may refer to any of the four comets discovered by Finnish astronomer, Yrjö Väisälä, below: 40P/Väisälä 139P/Väisälä–Oterma, co-discovered
Comet_Väisälä
Topics referred to by the same term
139P/Väisälä–Oterma, a periodic comet discovered by Yrjö Väisälä and Liisi Oterma 1573 Väisälä, a minor planet named for Yrjö Väisälä Brunt–Väisälä frequency
Vaisala_(disambiguation)
Topics referred to by the same term
Väisälä may refer to: Vaisala, Samoa, a village in the island of Savai'i Vilho Väisälä (1889–1969), Finnish meteorologist and physicist Vaisala, a company
Väisälä
Measure of fluid stability against vertical displacement
atmospheric dynamics, oceanography, asteroseismology and geophysics, the Brunt–Väisälä frequency, or buoyancy frequency, is a measure of the stability of a fluid
Brunt–Väisälä_frequency
Asteroid
1573 Väisälä, provisional designation 1949 UA, is a stony Phocaea asteroid, slow rotator and suspected tumbler from the inner regions of the asteroid
1573_Väisälä
Finnish teacher (b. 1916, d. 2011)
Marja Ilmatar Väisälä (9 May 1916, Helsinki, Finland – 21 December 2011, Turku) was a Finnish teacher of mathematics and natural sciences, who in 1950
Marja_Väisälä
Village in Vaisigano, Samoa
Vaisala is a small village on the northwest coast of Savai'i island in Samoa. The village lies within the political district of Vaisigano. The village's
Vaisala,_Samoa
Finnish meteorologist and physicist (1889–1969)
Vilho Väisälä (Finnish pronunciation: [ˈʋilho ˈʋæi̯sælæ]; September 28, 1889 – August 12, 1969) was a Finnish meteorologist and physicist, and founder
Vilho_Väisälä
Type of astronomical telescope
The Schmidt–Väisälä camera is a type of astronomical telescope intended for wide-field (5 to 10 degrees of arc) photographic work. It was designed by
Schmidt–Väisälä_camera
Periodic comet
40P/Väisälä is a periodic comet that was discovered on February 8, 1939. Its orbit was determined on April 26, 1939. In 1994, the diameter of its nucleus
40P/Väisälä
(archeology) The Väisälä Prize (Finnish: Väisälän palkinto) was established by the Finnish Academy of Sciences and Letters in cooperation with the Väisälä Foundation
Finnish Academy of Science and Letters
Finnish_Academy_of_Science_and_Letters
Halley-type comet
C/1942 EA (Väisälä) is a Halley-type comet with an orbital period of about 86±4 years. It is the third of four comets discovered by Finnish astronomer
C/1942_EA_(Väisälä)
Crater on the Moon
Väisälä is a tiny lunar impact crater located on a rise in the Oceanus Procellarum. Sharing the same continental island are the brilliant crater Aristarchus
Väisälä_(crater)
Astrophotographic telescope
independently invented by Finnish astronomer Yrjö Väisälä in 1924 (sometimes called the Schmidt–Väisälä camera as a result). Schmidt originally introduced
Schmidt_camera
American weather data provider
Mataczynski. It is based in Eden Prairie, Minnesota. The company is owned by Vaisala Group following an acquisition in late January 2022. Paul Douglas first
AerisWeather
developed by the Finnish technology company Vaisala. Xweather was introduced in September 2022 as part of Vaisala’s expansion into weather and environmental
Xweather
Periodic comet with 9 year orbit
139P/Väisälä–Oterma is a periodic comet in the Solar System. When it was discovered in 1939 it was not recognized as a comet and designated as asteroid
139P/Väisälä–Oterma
September 12, 1936 Turku Y. Väisälä · 6.8 km (4.2 mi) MPC · JPL 1406 Komppa 1936 RF Komppa September 13, 1936 Turku Y. Väisälä · 24 km (15 mi) MPC · JPL
List of minor planets: 1001–2000
List_of_minor_planets:_1001–2000
Capital and most populous city of Ohio, United States
city include Germany-based Siemens and Roxane Laboratories, Finland-based Vaisala, Tomasco Mulciber Inc., A Y Manufacturing, as well as Switzerland-based
Columbus,_Ohio
Finnish astronomer (1912–1997)
planets. From 1937 to 1956, he was an observatory assistant under Yrjö Väisälä at Turku Observatory, where he discovered 12 asteroids. Alikoski later
Heikki_A._Alikoski
mile (about 20 per km2) per year. In their 2018 Annual Lightning Report, Vaisala reported there were 24 strikes per square mile (about 9 per km2) per year
Distribution_of_lightning
Finnish astronomer
mathematics and astronomy at the University of Turku, and soon became Yrjö Väisälä's assistant and worked on the search for minor planets. She obtained her
Liisi_Oterma
Constructed auxiliary language
and 1462 Zamenhof discovered by Finnish astronomer and Esperantist Yrjö Väisälä. Constructed languages portal Language portal Arcaicam Esperantom Baza
Esperanto
Specialized agency of the United Nations
messages. International Meteorological Organization Prize Professor Dr Vilho Väisälä Awards Norbert Gerbier-Mumm International Award (suspended in 2014) WMO
World Meteorological Organization
World_Meteorological_Organization
Welsh meteorologist (1886–1965)
elected a Fellow of the college. He independently co-discovered the Brunt–Väisälä frequency. In 1926, Brunt published "Periodicities in European Weather"
David_Brunt
Country in Northern Europe
companies expanding into fields such as electronics (Nokia), metrology (Vaisala), petroleum (Neste), and video games (Rovio Entertainment), and is no longer
Finland
Meteorological instrumentation
Rocketsonde Totex - a Japanese manufacturer of meteorological balloons Vaisala Vilho Väisälä Water-activated battery Cricketsonde Karin L. Gleason (March 20
Radiosonde
Mathematical space with a notion of distance
{\displaystyle x} to the boundary. Metametrics were first defined by Jussi Väisälä. In other work, a function satisfying these axioms is called a partial
Metric_space
7 mi) MPC · JPL 5073 Junttura 1943 EN Junttura March 3, 1943 Turku Y. Väisälä · 5.9 km (3.7 mi) MPC · JPL 5074 Goetzoertel 1949 QQ1 Goetzoertel August
List of minor planets: 5001–6000
List_of_minor_planets:_5001–6000
Weather phenomenon involving electrostatic discharge
Lightning Location Network (WWLLN) is an academic led detection system. The Vaisala GLD360 network is a private enterprise. In addition to ground-based lightning
Lightning
Comets with a period of over 1,000 years
2280 0.992196 173.4555 1.353647 19.7127 1943/02/06 MPC · JPL C/1944 H1 Väisälä 7140 0.9935 370.9009 2.410856 17.2882 1945/01/04 MPC · JPL C/1947 F1 Rondanina–Bester
List_of_near-parabolic_comets
JPL 6073 Tähtiseuraursa 1939 UB Tähtiseuraursa October 18, 1939 Turku Y. Väisälä EUN · 8.9 km (5.5 mi) MPC · JPL 6074 Bechtereva 1968 QE Bechtereva August
List of minor planets: 6001–7000
List_of_minor_planets:_6001–7000
Finnish geodesist (1909–1997)
University of Turku in 1940 on the metrology of length by means of the Väisälä comparator. He served as the director of the Finnish Geodetic Institute
Tauno_Kukkamäki
Equatorially trapped waves that carry energy eastwards
as their distance increases away from the equator (so long as the Brunt–Vaisala frequency does not remain constant). These waves have the same trapping
Rossby-gravity_waves
Samoan lawyer and judge (c.1953–2020)
Minister Vaʻai Kolone. Vaepule is from the village of Vaisala in Savai'i. He was educated at Vaisala Primary School, Leififi Intermediate, Samoa College
Vaepule_Alo_Vaemoa_Vaai
District in Samoa
Vaisigano is 6,543 (2016 Census). Within the district is the village of Vaisala whose chief Va'ai Kolone became the Prime Minister of Samoa twice in the
Vaisigano
Temperature below which condensation occurs
2009-08-20. "Dew Point in Compressed Air – Frequently Asked Questions" (PDF). Vaisala. Archived from the original (PDF) on 16 February 2018. Retrieved 15 February
Dew_point
Observatory
astronomy professor Yrjö Väisälä. Väisälä's research team discovered a total of 807 minor planets and 7 comets at the observatory. Väisälä also contributed significantly
Iso-Heikkilä_Observatory
Finnish writer (1888–1964)
discovered on January 26, 1938, by Finnish astronomer and physicist Yrjö Väisälä, was named after him. Sillanpää died on 3 June 1964 in Helsinki aged 75
Frans_Eemil_Sillanpää
9 km (4.9 mi) MPC · JPL 2020 Ukko 1936 FR Ukko March 18, 1936 Turku Y. Väisälä EOS 19 km (12 mi) MPC · JPL 2021 Poincaré 1936 MA Poincaré June 26, 1936
List of minor planets: 2001–3000
List_of_minor_planets:_2001–3000
Fagalele Bay Fagaloa Bay Lefaga Bay Matautu Bay Paluali Bay Papalaulelei Bay Salailua Bay Sataua Bay Siumu Bay Uafato Bay Vailele Bay Vaisala Bay Vaiusu Bay
List_of_bays_in_Samoa
List of people with the same nickname
(1887–1931), British motorcycle racer, the "Wizard of Brooklands" Yrjö Väisälä (1891–1971), Finnish astronomer and physicist, the "Wizard of Tuorla" John
The_Wizard_(nickname)
Measurement of electromagnetic radiation
including 3E, Clean Power Research, SoDa Solar Radiation Data, Solargis, Vaisala (previously 3Tier), and Vortex, and these firms have often provided solar
Solar_irradiance
Mapping which preserves all topological properties of a given space
Introduction to Topology (2nd ed.). Dover. p. 67. ISBN 978-0-486-40680-0. Väisälä, Jussi (1999). Topologia I. Limes RY. p. 63. ISBN 951-745-184-9. Dijkstra
Homeomorphism
Periodic comet
Numbered comets Previous 137P/Shoemaker-Levy 138P/Shoemaker–Levy Next 139P/Väisälä–Oterma
138P/Shoemaker–Levy
Event occurring every 1024 weeks
include cellphones that were sold in 2013 or earlier, certain types of older Vaisala radiosonde groundstations, suspending launches at some stations for up
GPS_week_number_rollover
Utulaelae, Falealili Vaiala Vaigaga Vailima Vailoa Vailu'utai Vaimoso Vaiola Vaisala Vaisigano Vaiee Vaito'omuli Vaitele Vaiusu Vaivase Tai Vaivase Uta Vavau
List of cities, towns and villages in Samoa
List_of_cities,_towns_and_villages_in_Samoa
Finnish mathematician and educator
Institute of Physics, 2012–2015. On December 14, 2009, she was awarded the Väisälä Prize of the Finnish Academy of Science and Letters in the field of Mathematics
Kaisa_Miettinen
Topics referred to by the same term
Systems Inc., a maker of wind-energy instrumentation, a subsidiary of Vaisala Second Wind (entertainment group), an entertainment group run by former
Second_Wind
Main-belt asteroid
in diameter. It was discovered on 19 January 1939, by astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory near Turku, Finland. The asteroid was named
1533_Saimaa
Finnish mathematician (1870–1946)
students in the 1910s were Felix Iversen, Pekka Myrberg, Kalle Väisälä [fi], Vilho Väisälä, Nils Pipping [fi], Frithiof Nevanlinna, and Rolf Nevanlinna
Ernst_Leonard_Lindelöf
Large central area of thunderstorms surrounding its circulation center
"Long Range Lightning Nowcasting Applications For Meteorology" (PDF). Vaisala. Retrieved 2012-08-12. Landsea, Chris & Sim Aberson (2004-08-13). "What
Central_dense_overcast
Creator of Esperanto (1859–1917)
Zamenhof is named in his honour. It was discovered on 6 February 1938 by Yrjö Väisälä. There is also a minor planet named in honour of Esperanto (1421 Esperanto)
L._L._Zamenhof
2δ apart (in the sense of the Hausdorff distance between closed sets). Väisälä, Jussi (2005-09-15). "Gromov hyperbolic spaces". Expositiones Mathematicae
Gromov_product
Remote observation of lightning strikes
related to lightning detectors. Vaisala Lightning Detection Archived 2016-03-07 at the Wayback Machine from Vaisala Recent North American lightning activity
Lightning_detector
Concept in atmospheric dynamics and physical oceanography
n}\equiv {\frac {NH}{n\pi f_{0}}}} , where N {\displaystyle N} is the Brunt–Väisälä frequency, H {\displaystyle H} is the scale height, and n = 1, 2, ...
Rossby_radius_of_deformation
Ursa is a non-profit society of amateur astronomers, founded by Yrjö Väisälä in 1921. Ursa has grown to be one of the largest astronomical societies
Meanings of minor-planet names: 6001–7000
Meanings_of_minor-planet_names:_6001–7000
Observatory
forms the Väisälä Institute of Space Physics and Astronomy (VISPA). Tuorla Observatory was established on April 29, 1952 by professor Yrjö Väisälä. A new
Tuorla_Observatory
Main-belt asteroid
diameter. It was discovered on 17 March 1939, by Finnish astronomer Yrjö Väisälä at Turku Observatory on the coast of southwestern Finland. The asteroid
1757_Porvoo
Manufacturer of bricks and masonry
State University. "Strong expertise from General Shale Brick | Vaisala". www.vaisala.com. 2009-11-20. Retrieved 2026-08-31. Meade, Roy H. "Supplement
General_Shale
Phenomenon of fluid mechanics
where N = g / L ρ {\textstyle N={\sqrt {g/L_{\rho }}}} denotes the Brunt–Väisälä frequency, U is the horizontal parallel velocity, k is the wave number
Kelvin–Helmholtz_instability
Tardi, 1897–1972 (France) Peter J. G. Teunissen, 1957 (Netherlands) Yrjö Väisälä, 1889–1971 (Finland) Petr Vaníček, 1935 (Canada) Felix Andries Vening-Meinesz
List_of_geodesists
4th Prime Minister of Western Samoa
September 1982, and then from 30 December 1985 until 8 April 1988. He was from Vaisala village on Savai'i island in the political district of Vaisigano. Kolone
Vaʻai_Kolone
Hildian asteroid
asteroid was discovered on 23 February 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. It was named after astronomer
2067_Aksnes
Schmidt–Cassegrain telescope (Meade Instruments) Schmidt–Newtonian telescope Schmidt–Väisälä camera Telescopes classified by the task performed Astrograph Astronomical
List_of_telescope_types
Surjective isometries are affine mappings
(4): 397–398. arXiv:1306.2380. doi:10.1016/j.exmath.2012.08.010. Jussi Väisälä (2003). "A Proof of the Mazur–Ulam Theorem". The American Mathematical
Mazur–Ulam_theorem
43 km (27 mi) MPC · JPL 3037 Alku 1944 BA Alku January 17, 1944 Turku Y. Väisälä · 30 km (19 mi) MPC · JPL 3038 Bernes 1978 QB3 Bernes August 31, 1978
List of minor planets: 3001–4000
List_of_minor_planets:_3001–4000
Annual expo of Commodore computers
Rinehart, and Winston; Houghton Mifflin; Mastertronic; TPUG; The Transactor; Vaisala; and Watcom. The third annual World of Commodore expo was held at the International
World_of_Commodore
Name list
Finnish writer and socialist politician Yrjö Sotamaa, Finnish architect Yrjö Väisälä (1891–1971), Finnish astronomer and physicist Yrjö Vartia (born 1946),
Yrjö
Astronomical observatory in Finland
Observatory of University of Turku. The association was founded by Yrjö Väisälä, Liisi Oterma, Hilkka Rantaseppä-Helenius, and other astronomers working
Kevola_Observatory
interference based measurement system was taken to use. It was developed by Yrjö Väisälä. Before that baseline was defined by quartz made measuring rod, which was
Nummela_Standard_Baseline
Part of large-scale ocean circulation
cycle that affects the surface temperature of the North Atlantic Brunt-Väisälä frequency – Measure of fluid stability against vertical displacementPages
Thermohaline_circulation
George James Symons Geoffrey Ingram Taylor Tetsu Tamura Reed Timmer Vilho Väisälä Bernard Vonnegut Roger Wakimoto Alfred Wegener Heinrich von Wild Larry
List_of_meteorologists
1950–pres. A. Vagnozzi (7529) Marja Väisälä 2 1916–2011 M. Väisälä M. Vaisala — Yrjö Väisälä 128 1891–1971 Y. Väisälä Y. Vaisala (1573), (2804) George Van Biesbroeck
List of minor planet discoverers
List_of_minor_planet_discoverers
Measurement method using interference of waves
A method of establishing precise geodetic baselines, invented by Yrjö Väisälä, exploited the low coherence length of white light. Initially, white light
Interferometry
Stony asteroid, slow rotator and suspected tumbler
diameter. It was discovered on 26 January 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. The asteroid was named for the
1447_Utra
Upward force that opposes the weight of an object immersed in fluid
paradox of hydrostatic pressure Buoy – Floating structure or device Brunt–Väisälä frequency – Measure of fluid stability against vertical displacement Buoyancy
Buoyancy
Doukas (2012-08-22). "Μετεωρολογικός Σταθμός του Ελληνικού Πυροβολικού VAISALA RT 20 AM". Προέλαση (in Greek). Retrieved 2022-11-01. "Stentor - Radartutorial"
List of equipment of the Hellenic Army
List_of_equipment_of_the_Hellenic_Army
Asteroid
diameter. It was discovered on 16 October 1938, by Finnish astronomer Yrjö Väisälä at the Turku Observatory in Southwest Finland. It was named for the Finnish
1500_Jyväskylä
American engineer and weather radar pioneer
co-recipient of the IEEE Donald G. Fink Prize; 1996 co-recipient of the Vilho Väisälä Prize of the World Meteorological Organization (WMO). 2004 Presidential
Dusan_S._Zrnic
Dark asteroid
diameter. It was discovered on 3 March 1943 by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. Lyyli orbits the Sun in the
2204_Lyyli
Fabs present & past worldwide
Prefecture, Yasu Murata Electronics (Finland) (formerly VTI, since 1979 Vaisalas int. semicon. line) Vantaa Finland 2012, expanded 2019 3D MEMS accelerometers
List of semiconductor fabrication plants
List_of_semiconductor_fabrication_plants
Dimensionless metric in fluid dynamics
{N^{2}}{(\partial u/\partial z)^{2}}},} where N {\displaystyle N} is the Brunt–Väisälä frequency and ∂ u / ∂ z {\displaystyle \partial u/\partial z} is the water
Richardson_number
Main-belt asteroid
diameter. It was discovered on 24 November 1937, by Finnish astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory in Turku, Finland. The asteroid was named
1460_Haltia
Person speaking or using the international language Esperanto
Leonardo Torres Quevedo, Spanish engineer, mathematician and inventor. Yrjö Väisälä, Finnish astronomer, discovered asteroids 1421 Esperanto and 1462 Zamenhof
List_of_Esperanto_speakers
Background asteroid
in diameter. It was discovered on 20 February 1938, by astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory in Turku, Finland. The asteroid was named
1450_Raimonda
Culture Center, Osaka, is an expert in telescope making and has made Wright-Väisälä, Dall-Kirkham, Schiefspiegler and other optics in addition to mechanical
Meanings of minor-planet names: 8001–9000
Meanings_of_minor-planet_names:_8001–9000
Concept in thermodynamics
{\displaystyle r_{L}} is the mixing ratio of liquid water in the air. The Brunt–Väisälä frequency is a closely related quantity that uses potential temperature
Potential_temperature
Main-belt asteroid
diameter. It was discovered on 19 January 1939, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. It was later named after Norwegian
1646_Rosseland
(6.0 mi) MPC · JPL 4181 Kivi 1938 DK1 Kivi February 24, 1938 Turku Y. Väisälä slow 8.3 km (5.2 mi) MPC · JPL 4182 Mount Locke 1951 JQ Mount Locke May
List of minor planets: 4001–5000
List_of_minor_planets:_4001–5000
Danish national weather forecasting service
newer Vaisala dual-polarization radar, and the Virring (2008) radar was gradually phased out in favor of a new radar on Samsø, also made by Vaisala. In
Danish Meteorological Institute
Danish_Meteorological_Institute
Main-belt asteroid
diameter. It was discovered on 18 October 1939, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. It was named for the Swedish
1527_Malmquista
Mathematical inequality in astrophysics
the medium is unstable against convection. Archimedes' principle Brunt–Väisälä frequency Convection Schwarzschild, Martin (2015-12-08). Structure and
Schwarzschild_criterion
Emppu Vuorinen, Finnish musician Vilho Väisälä, Finnish meteorologist, physicist and founder of Vaisala Yrjö Väisälä, Finnish astronomer and physicist Stephen
List_of_Karelians
Electrical components & equipment Vaasa 1993 Variable-speed AC drives P A Vaisala Technology Software Vantaa 1936 Environmental measuring technology P A
List_of_companies_of_Finland
1204 device driver, validated with: Lufft Lcom Campbell Scientific CR1000 Vaisala dmc586 QTT LX-RPU Elite High Sierra Electronics ESS Optical Scientific
IRIS (transportation software)
IRIS_(transportation_software)
Vestian main-belt asteroid
7 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland, on 20 January 1939. The asteroid
1929_Kollaa
1095 Tulipa, and the object 1938 DO discovered February 20, 1938, by Yrjö Väisälä was named 1449 Virtanen. In 1966 it was discovered that these were one
List_of_exceptional_asteroids
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