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((Use dmy dates|date=November 2015))
((more citations needed|date=February 2013))
((Infobox organization
| name = International Union of Radio Science
| image = 
| image_border = 
| size = 
| alt = 
| caption = URSI
| map = 
| msize = 
| malt = 
| mcaption = 
| abbreviation = URSI
| motto = 
| formation = ((start date and age|1919))
| extinction = 
| type = [[International nongovernmental organization|INGO]]
| status = 
| purpose = 
| headquarters = 
| location = 
| region_served = Worldwide
| membership = 
| language = English, French
| leader_title = President
| leader_name = Ari Sihvola (Finland)
| main_organ = 
| parent_organization = [[International Council for Science]]
| affiliations = 
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))

The '''International Union of Radio Science''' ([[abbreviation|abbreviated]] '''''URSI''''', after its French name, ((lang-fr|link=no|'''Union radio-scientifique internationale'''))) is one of 26 international [[scientific union]]s affiliated to the [[International Council for Science]] (ICSU).

== History and objectives ==

URSI was officially created in 1919, during the Constitutive Assembly of the International Research Council (now ICSU), based on the earlier ((lang-fr|link=no|Commission Internationale de Telegraphie sans Fil)) (1913–1914) when the only radio communication system was [[radiotelegraphy]]. It has held a general assembly every three years from 1922. Fifty years ago URSI was one of the most important promoters of the [[International Geophysical Year]]. It co-sponsors the ''[[Radio Science]]'' journal (co-sponsored by the [[American Geophysical Union]]) as well as the ''[[Journal of Atmospheric and Solar-Terrestrial Physics]]''.

URSI's original objective (to encourage "scientific studies of radiotelegraphy, especially those which require international cooperation") has been broadened to include all [[radio science]], from [[radio communication|telecommunications]] to [[radio astronomy]], acquisition of [[radar]] information about distant passive objects, studies of the radiation stimulated or spontaneously emitted by these objects, biological effects of electromagnetic radiation and active modification of objects by [[radio wave]]s, within the spectrum from [[extremely low frequency]] to the [[optics|optical]] domain.

== Commissions ==

* Commission A: Electromagnetic Metrology
* Commission B: Fields and Waves
* Commission C: Radiocommunication Systems and Signal Processing
* Commission D: Electronics and Photonics
* Commission E: Electromagnetic Environment and Interference
* Commission F: Wave Propagation and Remote Sensing
* Commission G: Ionospheric Radio and Propagation
* Commission H: Waves in Plasmas
* Commission J: Radio Astronomy
* Commission K: Electromagnetics in Biology and Medicine

A few Commissions are engaged with international projects in cooperation with other international bodies, for example with the [[Committee on Space Research]] in the project [[International Reference Ionosphere]].<ref>((Cite web|url=http://ccmc.gsfc.nasa.gov/modelweb/ionos/iri.html|title=International Reference Ionosphere|access-date=20 January 2010|archive-date=24 October 2010|archive-url=https://web.archive.org/web/20101024051519/http://ccmc.gsfc.nasa.gov/modelweb/ionos/iri.html|url-status=dead))</ref>

== Individual Membership ==

The URSI includes different individual membership grades: 
*Corresponding member (CURSI)
*Senior member, awarded to members who have a PhD, 10+ publications, and a history of involvement with the URSI
*Fellow, by invitation or by winning a URSI senior prize<ref>((cite web |url=https://www.ursi.org/membership.php#tab-sectionA2 |publisher=URSI |access-date=31 January 2021|title=URSI Individual Membership ))</ref>

==See also==
* [[Radio science#URSI]]

==References==
<references />

==External links==
*((official website|http://www.ursi.org))
*[http://www.usnc-ursi.org/  United States National Committee of the International Union of Radio Science]

((International Science Council))
((Authority control))

[[Category:Ghent University]]
[[Category:Members of the International Council for Science]]
[[Category:Organisations based in East Flanders]]
[[Category:Radio organizations]]
[[Category:Scientific organisations based in Belgium]]
[[Category:Scientific organizations established in 1919]]
[[Category:Members of the International Science Council]]


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