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.

ChatGPTRate this definition:0.0 / 0 votes

1. f region

   An "f region" typically refers to the highest region in the ionosphere, a part of Earth's atmosphere. This region is known for reflecting high and medium frequency radio waves and plays a crucial role in long-distance radio communication systems. It is divided into two layers - F1 and F2.

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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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. Robb Butler:

   Over the last decade, we've certainly seen a resurgence of vaccine preventable diseases in the European region, and measles is one of them, in 2017, we had a fourfold increase( in measles), and that seems to be continuing into 2018.

2. United States:

   This is an important milestone for Latin America and highlights the importance of technology transfer to increase the availability of quality COVID-19 vaccines in the region.

3. Hillary Clinton:

   This does put a lid on the nuclear program, but we still have a lot of concern about the bad behavior and the actions by Iran which remains the largest state sponsor of terrorism which does go after and undermine governments in the region, that poses an existential threat to Israel, that unfairly, unlawfully confines and tries Americans on trumped up charges, that bad behavior is something we have to address.

4. Trygve Munthe:

   If this drags out over time, we think the Middle East is the only producing region with an ability to ramp up production on a more sustained basis.

5. Iranian Defense Minister Hossein Dehghan:

   If an American ship enters Iran’s maritime region, it will definitely get a warning. We will monitor them and, if they violate our waters, we will confront them.

References

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