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อภิธานศัพท์: อภิธานศัพท์ฟิสิกส์ (อวกาศ)
C
CONTINUUM STORM (CTM) General term for solar noise lasting for hours and
sometimes days.
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COORDINATED UNIVERSAL TIME By international agreement, the local time at
the prime meridian, which passes through Greenwich, England.
Therefore, it is also known as GREENWICH MEAN TIME, or sometimes
simply UNIVERSAL TIME.
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CORONA The outermost layer of the solar atmosphere, characterized by low
densities (1.0E+09/cc) and high temperatures (1,0E+06deg.K).
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CORONAL HOLE An extended region of the CORONA, exceptionally low in density
and associated with unipolar photospheric regions.
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CORONAL RAIN (CRN) Material condensing in the CORONA and appearing to rain
down into the CHROMOSPHERE as observed in H-ALPHA at the solar LIMB
above strong SUNSPOTS.
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CORONAL TRANSIENTS A general term for short-time-scale changes in the
CORONA, but principally used to describe outward-moving PLASMA
clouds.
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COSMIC RAY An extremely energetic (relativistic) charged particle.
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CROCHET A sudden deviation in the sunlit geomagnetic field (H component;
see GEOMAGNETIC ELEMENTS) associated with large solar
FLARE X-ray emission.
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D
D REGION A daytime layer of the earth's IONOSPHERE approximately 50 to
90 km in altitude.
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DARK SURGE ON DISK (DSD) Dark gaseous ejections visible in H-ALPHA.
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DIFFERENTIAL ROTATION The change in SOLAR ROTATION RATE with latitude. Low
latitudes rotate at a faster angular rate (approx. 14 degrees per
day) than do high latitudes (approx. 12 degrees per day).
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DISAPPEARING SOLAR FILAMENT (DSF) The sudden (timescale of minutes to
hours) disappearance of a solar FILAMENT (PROMINENCE).
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DISK The visible surface of the sun (or any heavenly body) projected
against the sky.
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Dst INDEX A geomagnetic index describing variations in the equatorial
ringcurrent.
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E
E REGION A daytime layer of the earth's ionosphere roughly between the
altitudes of 85 and 140 km.
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