อภิธานศัพท์ฟิสิกส์ (อวกาศ)


อภิธานศัพท์ฟิสิกส์ (อวกาศ)
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C

CONTINUUM STORM (CTM)

General term for solar noise lasting for hours and sometimes days.

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.

CORONA

The outermost layer of the solar atmosphere, characterized by low densities (1.0E+09/cc) and high temperatures (1,0E+06deg.K).

CORONAL HOLE

An extended region of the CORONA, exceptionally low in density and associated with unipolar photospheric regions.

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.

CORONAL TRANSIENTS

A general term for short-time-scale changes in the CORONA, but principally used to describe outward-moving PLASMA clouds.

COSMIC RAY

An extremely energetic (relativistic) charged particle.

CROCHET

A sudden deviation in the sunlit geomagnetic field (H component; see GEOMAGNETIC ELEMENTS) associated with large solar FLARE X-ray emission.

D

D REGION

A daytime layer of the earth's IONOSPHERE approximately 50 to 90 km in altitude.

DARK SURGE ON DISK (DSD)

Dark gaseous ejections visible in H-ALPHA.

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).

DISAPPEARING SOLAR FILAMENT (DSF)

The sudden (timescale of minutes to hours) disappearance of a solar FILAMENT (PROMINENCE).

DISK

The visible surface of the sun (or any heavenly body) projected against the sky.

Dst INDEX

A geomagnetic index describing variations in the equatorial ringcurrent.

E

E REGION

A daytime layer of the earth's ionosphere roughly between the altitudes of 85 and 140 km.


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