Definitions for f region
f region

Princeton's WordNetRate this definition:0.0 / 0 votes

1. Appleton layer, F layer, F regionnoun

   the highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission

WikipediaRate this definition:0.0 / 0 votes

1. F region

   The F region of the ionosphere is home to the F layer of ionization, also called the Appleton–Barnett layer, after the English physicist Edward Appleton and New Zealand physicist and meteorologist Miles Barnett. As with other ionospheric sectors, 'layer' implies a concentration of plasma, while 'region' is the volume that contains the said layer. The F region contains ionized gases at a height of around 150–800 km (100 to 500 miles) above sea level, placing it in the Earth's thermosphere, a hot region in the upper atmosphere, and also in the heterosphere, where chemical composition varies with height. Generally speaking, the F region has the highest concentration of free electrons and ions anywhere in the atmosphere. It may be thought of as comprising two layers, the F1 and F2 layers. The F-region is located directly above the E region (formerly the Kennelly-Heaviside layer) and below the protonosphere. It acts as a dependable reflector of HF radio signals as it is not affected by atmospheric conditions, although its ionic composition varies with the sunspot cycle. It reflects normal-incident frequencies at or below the critical frequency (approximately 10 MHz) and partially absorbs waves of higher frequency.

WikidataRate this definition:0.0 / 0 votes

1. F region

   The F region of the ionosphere is home to the F layer of ionization, also called the Appleton layer, after the English physicist Edward Appleton. As with other ionospheric sectors, 'layer' implies a concentration of plasma, while 'region' is the area that contains the said layer. The F region contains ionized gases at a height of around 150–800 km above sea level, placing it in the Earth’s thermosphere, a hot region in the upper atmosphere, and also in the heterosphere, where chemical composition varies with height. Generally speaking, the F region has the highest concentration of free electrons and ions anywhere in the atmosphere. It may be thought of as comprising two layers, the F1-and F2-layers. The F-region is located directly above the E region and below the protonosphere. It acts as a dependable reflector of radio signals as it is not affected by atmospheric conditions, although its ionic composition varies with the sunspot cycle. It reflects normal-incident frequencies at or below the critical frequency and partially absorbs waves of higher frequency. The F region is the region of the ionosphere which is very important for HF radio wave propagation. This F region is very anomalous in nature.

Matched Categories

1. • Ionosphere
   • Region

How to pronounce f region?

1. Alex

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   Mark

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   Daniel

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How to say f region in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of f region in Chaldean Numerology is: 4

2. Pythagorean Numerology

   The numerical value of f region in Pythagorean Numerology is: 2

Examples of f region in a Sentence

1. Patrick Coote:

   One of the restrictions in this region is simply there are no facilities, the yachts we build could not physically come into this marina.

2. Aizaz Ahmad Chaudhry:

   Pakistan fully supports peace talks between the Afghan government and Taliban in Qatar, peace in Afghanistan is imperative for peace in the region.

3. Aurelien Tobie:

   The risk is that links develop between Fulanis throughout the region and it could be the next major regional conflict, everywhere Fulanis are marginalized, they have a strong identity and there are connections between them.

4. President Trump:

   We can not be the policeman of the world, we can not protect countries all over the world, where they're not paying us what we need. When asked whether United States has to do something regarding North Korea, National Security Adviser H.R. McMaster said, Well yes, we do have to do something, and so we have to do something, again, with partners in the region and globally, and that involves enforcement of the UN sanctions that are in place. United States may mean ratcheting up those sanctions even further, and it also means being prepared for military operations if necessary, he said. Trump has, since in office, attempted to form alliances with world leaders to solve such global crises as the Syrian civil war and the North Korea nuclear threat, including an outreach to China President XI Jinping.

5. Diana Francis:

   Melting ice in the Arctic is reducing the temperature created between the polar region and mid latitudes and this makes the weather systems move slowly over our region, convection [ leading to storms ] now can occur over several days whereas before, without climate change, it would have occurred over several hours and moved on.

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=f region
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/F_Region
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=f region