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. Chris Christie:

   Amtrak's indifference to New Jersey commuters and its abject neglect of the infrastructure that New Jersey and our entire region relies upon.

2. Mick Mulroy:

   The State Department's 'maximum pressure' campaign has not pressured Iran toward diplomacy and a new agreement. It has pressured them toward an increase in malign activity in the region and toward the development of a nuclear weapon, said Mick Mulroy, Trump's former top Pentagon official for the Middle East and a retired CIA officer who's now an ABC News contributor.

3. Robert Dobrzycki:

   We are building German-driven e-commerce buildings in central Europe. On top of that we see a huge trend of investors outside the region trying to diversify and hedge against a slow-down in other real estate sectors.

4. Ali Akbar Velayati:

   There is no benefit to tensions mounting up in the region. We must not take the side of either party, and have a duty to reduce tensions between these two countries.

5. Mike Simpson:

   What exciting news for DOE and the Idaho Cleanup project, a successful clean-up means protection for the region and the Snake River Plain Aquifer.

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