อภิธานศัพท์ฟิสิกส์ (อวกาศ)
Completion requirements
อภิธานศัพท์ฟิสิกส์ (อวกาศ)
เลือกดูโดยใช้ดัชนีคำศัพท์
พิเศษ | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ก | ข | ค | ฆ | ง | จ | ฉ | ช | ซ | ฌ | ญ | ฎ | ฏ | ฐ | ฑ | ฒ | ณ | ด | ต | ถ | ท | ธ | น | บ | ป | ผ | ฝ | พ | ฟ | ภ | ม | ย | ร | ล | ว | ศ | ษ | ส | ห | ฬ | อ | ฮ | ทั้งหมด
F |
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F REGION The upper layer of the IONOSPHERE, approximately 120 to 1500 km
in altitude. The F region is subdivided into the F1 and F2
regions. The F2 region is the most dense and peaks at altitudes
between 200 and 600 km. The F1 region is a smaller peak in
electron density, which forms at lower altitudes in the daytime.
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FACULA A bright region of the PHOTOSPHERE seen in white light, seldom
visible except near the solar LIMB.
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FIBRIL A linear pattern in the H-ALPHA CHROMOSPHERE of the sun, as seen
through an H-alpha filter, occurring near strong SUNSPOTS and
PLAGE or in FILAMENT channels.
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FILAMENT A mass of gas suspended over the PHOTOSPHERE by magnetic fields
and seen as dark lines threaded over the solar DISK. A filament
on the LIMB of the sun seen in emission against the dark sky is
called a PROMINENCE.
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FILAMENT CHANNEL A broad pattern of FIBRILS in the CHROMOSPHERE, marking
where a FILAMENT may soon form or where a filament recently
disappeared.
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FLARE A sudden eruption of energy on the solar DISK lasting minutes to
hours, from which radiation and particles are emitted.
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FLUENCE Time integrated flux.
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FLUX The rate of flow of a physical quantitiy through a reference surface.
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fMIN The lowest radiowave frequency that can be reflected from the
IONOSPHERE.
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foEs The maximum ORDINARY MODE radiowave frequency capable of reflec-
tion from the SPORADIC E REGION of the IONOSPHERE.
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foF2 The maximum ORDINARY MODE radiowave frequency capable of reflec-
tion from the F2 REGION of the IONOSPHERE.
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FORBUSH DECREASE An abrupt decrease, of at least 10%, of the background
galactic COSMIC RAY intensity as observed by neutron monitors.
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