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
T |
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TYPE I, II, III, IV See RADIO EMISSION
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U |
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U BURST A fast radio burst spectrum of a FLARE. It has a U-shaped appear-
ance in an intensity-vs.-frequency plot.
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ULTRA HIGH FREQUENCY (UHF) Those radio frequencies exceeding 300 MHz.
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UMBRA The dark core or cores (umbrae) in a SUNSPOT with PENUMBRA, or a
sunspot lacking penumbra.
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UNIVERSAL TIME (UT) See COORDINATED UNIVERSAL TIME.
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UNSETTLED With regard to geomagnetic levels, a descriptive word speci-
fically meaning that 8 is less than or equal to the Ap INDEX which is less than or equal to15.
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V |
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VERY HIGH FREQUENCY (VHF) That portion of the radio frequency spectrum
from 30 to 300 MHz.
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VERY LOW FREQUENCY (VLF) That portion of the radio frequency spectrum from
3 to 30 kHz.
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W |
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WHITE LIGHT (WL) Sunlight integrated over the visible portion of the spec-
trum (4000 - 7000 angstroms) so that all colors are blended to
appear white to the eye.
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WHITE LIGHT FLARE A major FLARE in which small parts become visible in
white light. Such flares are usually strong X-ray, radio, and
particle emitters.
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WOLF NUMBER An historic term for SUNSPOT NUMBER. In 1849, R. Wolf of
Zurich originated the general procedure for computing the sunspot
number.
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X |
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X-RAY BACKGROUND A daily average background X-ray flux in the 1 to 8
angstrom range. It is a midday minimum designed to reduce the
effects of FLAREs.
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X-RAY BURST A temporary enhancement of the X-ray emission of the sun. The
time-intensity profile of soft X-ray bursts is similar to that of
the H-ALPHA profile of an associated FLARE.
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Z |
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ZURICH SUNSPOT CLASSIFICATION A sunspot classification system that has been
modified for SESC use.
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