วันพฤหัสบดี, 25 เมษายน 2024, 4:34PM
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อภิธานศัพท์: อภิธานศัพท์ฟิสิกส์ (อวกาศ)
F
F CORONA Of the white-light CORONA (that is, the corona seen by the eye at
a total solar (ECLIPSE), that portion which is caused by sunlight
scattered or reflected by solid particles (dust) in inter-
planetary space.
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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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