Editing Anomalous propagation

{{Short description|Radio propagation due to unusual conditions}}
'''Anomalous propagation''' (sometimes shortened to '''anaprop''' or '''anoprop''')<ref>	Peter Meischner (ed.), ''Weather Radar: Principles and Advanced Applications'', Springer Science & Business Media, 2005, {{ISBN|3540003282}} page 144</ref> includes different forms of [[radio propagation]] due to an unusual distribution of temperature and humidity with height in the atmosphere.<ref name=WMO>{{Cite web|url=http://www.eumetcal.org/resources/ukmeteocal/rapid_cyclo/www/english/glossary/anomalou.htm|title=Anomalous propagation|author=World Meteorological Organization|author-link=World Meteorological Organization|publisher=Eumetcal|accessdate=2012-09-10|archive-url=https://web.archive.org/web/20150924014145/http://www.eumetcal.org/resources/ukmeteocal/rapid_cyclo/www/english/glossary/anomalou.htm|archive-date=2015-09-24|url-status=dead}}</ref> While this includes propagation with larger losses than in a standard atmosphere, in practical applications it is most often meant to refer to cases when signal propagates beyond normal radio horizon.

Anomalous propagation can cause interference to VHF and UHF radio communications if distant stations are using the same frequency as local services. Over-the-air analog television broadcasting, for example, may be disrupted by distant stations on the same channel, or experience distortion of transmitted signals [[Ghosting (television)|ghosting)]]. Radar systems may produce inaccurate ranges or bearings to distant targets if the radar "beam" is bent by propagation effects. However, radio hobbyists take advantage of these effects in [[TV and FM DX]].

== Causes ==

=== Air temperature profile ===
[[File:Superrefraction fr.jpg|thumb|Super refraction in radar operation]]
The first assumption of the prediction of propagation of a radio wave is that it is moving through air with temperature that declines at a standard rate with height in the [[troposphere]]. This has the effect of slightly bending (refracting) the path toward the Earth, and accounts for an effective range that is slightly greater than the geometric distance to the horizon. Any variation to this stratification of temperatures will modify the path followed by the wave.<ref name=WMO/>  Changes to the path can be separated into super and under [[refraction]]:<ref name=Patterson>W.L.Patterson, C.P.Hattan, G.E.Lindem, R.A.Paulus, H.V.Hitney, K.D.Anderson, A.E.Barrios. Technical Document 2648. Engineer's Refractive Effects Prediction System (EREPS) Version 3.0. May 1994. San Diego, CA</ref>

==== Super refraction ====
{{redirect|Super refraction|the music album|Super Refraction}}

It is very common to have [[temperature inversion]]s forming near the ground, for instance air cooling at night while remaining warm aloft. This happens equally aloft when a warm and dry airmass overrides a cooler one, like in the [[Subsidence (atmosphere)|subsidence]] aloft cause by a high pressure intensifying. The index of refraction of air increases in both cases and the EM wave bends toward the ground instead of continuing upward.

On surface-base inversion, the beam will eventually hit the ground and a part of it can be reflected back toward the emitter. In upper air inversion, the bending will be limited to the layer involved but the bending will extend the path of the beam, possibly beyond the usual transmission horizon.

==== Atmospheric duct ====
{{Main|Atmospheric duct}}
When the inversion is very strong and shallow, the EM wave is trapped within the inversion layer. The beam will bounce many times inside the layer as within a [[waveguide]]. In surface-based ducting, the beam will hit the ground many times, causing return echoes at regular distances toward the emitter. In elevated ducts, the transmission can be extended to very large distances.

==== Sub refraction ====

[[File:Subrefraction.jpg|thumb|Under refraction in radar operation]]
On the other hand, if the air is unstable and cools faster than the standard atmosphere with height, the wave is higher than expected and can miss the intended receiver.


=== Other causes ===

Other ways anomalous propagation is recorded is by [[troposcatter]]s causing irregularities in the [[troposphere]], [[scattering]] due to [[meteor]]s, refraction in the [[ionized]] regions and layers of the ionosphere, and [[Reflection (physics)|reflection]] from the ionosphere.<ref name=Patterson/>

Finally, [[multipath propagation]] near the [[Earth]]'s surface has multiple causes, including atmospheric ducting, ionospheric reflection and refraction, and reflection from water bodies and terrestrial objects such as mountains and buildings.

== In radio ==

Anomalous propagation can be a limiting factor for the propagation of radiowaves, especially the super refraction. However, reflection on the ionosphere is a common use of this phenomenon to extend the range of the signal. Other multiple reflections or refractions are more complex to predict but can be still useful.

== Radar ==

The position of the radar echoes depend heavily on the standard decrease of temperature hypothesis. However, the real atmosphere can vary greatly from the norm. Anomalous propagation refers to false radar echoes usually observed when calm, stable atmospheric conditions, often associated with super refraction in a [[temperature inversion]], direct the radar beam toward the ground. The processing program will then wrongly place the return echoes at the height and distance it would have been in normal conditions.<ref name="EC">{{Cite web
 |url=http://www.msc-smc.ec.gc.ca/cd/factsheets/weather_radar/index_e.cfm 
 |title=Commons errors in interpreting radar 
 |publisher=[[Environment Canada]] 
 |accessdate=2007-06-23 
 |url-status=dead 
 |archiveurl=https://web.archive.org/web/20060630014639/http://www.msc-smc.ec.gc.ca/cd/factsheets/weather_radar/index_e.cfm 
 |archivedate=2006-06-30 
}}</ref>

This type of false return is relatively easy to spot on a time loop if it is due to night cooling or marine inversion as one sees very strong echoes developing over an area, spreading in size laterally, not moving but varying greatly in intensity with time. After [[sunrise]], the inversion disappears gradually and the area diminishes correspondingly. Inversion of temperature exists too ahead of [[warm front]]s, and around [[thunderstorm]]s' cold pool. Since precipitation exists in those circumstances, the abnormal propagation echoes are then mixed with real rain and/or targets of interest, which make them more difficult to separate.

Anomalous propagation is different from ground [[Clutter (radar)|clutter]], ocean reflections (sea clutter), biological returns from birds and insects, debris, [[Chaff (radar countermeasure)|chaff]], [[sand storm]]s, [[volcanic eruption]] plumes, and other non-precipitation meteorological phenomena. Ground and sea clutters are permanent reflection from fixed areas on the surface with stable reflective characteristics. Biological scatterers gives weak echoes over a large surface. These can vary in size with time but not much in intensity. Debris and chaff are transient and move in height with time. They are all indicating something actually there and either relevant to the radar operator and/or readily explicable and theoretically able to be reproduced.

[[Doppler radar]]s and [[Pulse-Doppler radar]]s are extracting the velocities of the targets. Since anomalous propagation comes from stable targets, it is possible to subtract the reflectivity data having a null speed and clean the radar images. Ground, sea clutter and the energy spike from the sun setting can be distinguished the same way but not other [[Artifact (error)|artifacts]].<ref name="EC"/><ref name=NOAA>{{Cite web
|url=http://www.spc.noaa.gov/coolimg/radssets.htm
|title=Radar-detected Sunsets from Minnesota to Tennessee
|publisher=[[National Weather Service]]
|accessdate=2007-06-23| archiveurl= https://web.archive.org/web/20070706093302/http://www.spc.noaa.gov/coolimg/radssets.htm| archivedate= 6 July 2007 | url-status= live}}</ref> This method is used in most modern radars, including air traffic control and [[weather radar]]s.

== See also ==
*[[Non-line-of-sight propagation]]
*[[Wave propagation]]

== Notes ==
{{Reflist}}

{{DEFAULTSORT:Anomalous Propagation}}
[[Category:Radio frequency propagation]]
[[Category:Radar signal processing]]
[[Category:Radar meteorology]]