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อภิธานศัพท์: อภิธานศัพท์ฟิสิกส์ (อวกาศ)
P
PROMINENCE A term identifying cloud-like features in the solar atmosphere.
The features appear as bright structures in the CORONA above the
solar LIMB and as dark FILAMENTs when seen projected against the
solar DISK.
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PROTON Solar activity levels with at least on high energy event (Class X
Flares)
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PROTON EVENT By definition, the measurement of at least 10
protons/sq.cm/sec/steradian at energies greater than 10 MeV.
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PROTON FLARE Any FLARE producing significant FLUXes of greater-than-10 MeV
protons in the vicinity of the earth.
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Q
QUIESCENT PROMINENCE (FILAMENT) Long, sheet-like prominences nearly vertical
to the solar surface.
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QUIET A descriptive word specifically meaning geomagnetic levels such that
Ap LT 8 (see Ap INDEX).
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QUIET Solar activity levels with less than one chromospheric event per day
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R
RADIO EMISSION Emissions of the sun in radio wavelengths from centimeters
to dekameters, under both quiet and disturbed conditions.
Type I. A noise storm composed of many short, narrow-band bursts
in the metric range (300 - 50 MHz).
Type II. Narrow-band emission that begins in the meter range
(300 MHz) and sweeps slowly (tens of minutes) toward deka-
meter wavelengths (10 MHz). Type II emissions occur in
loose association with major FLAREs and are indicative of
a shock wave moving through the solar atmosphere.
Type III. Narrow-band bursts that sweep rapidly (seconds) from
decimeter to dekameter wavelengths (500 - 0.5 MHz). They
often occur in groups and are an occasional feature of complex
solar ACTIVE REGIONs.
Type IV. A smooth continuum of broad-band bursts primarily in the
meter range (300 - 30 MHz). These bursts are associated with
some major flare events beginning 10 to 20 minutes after the
flare maximum, and can last for hours.
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RADIO EVENT Flares with Centimetric Bursts and/or definite Ionospheric Event
(SID).
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RECURRENCE Used especially in reference to the recurrence of physical
parameters every 27 days (the rotation period of the sun).
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RIOMETER (Relative Ionospheric Opacity meter) A specially designed radio
receiver for continuous monitoring of cosmic noise. The
absorption of cosmic noise in the polar regions is very
sensitive to the solar low-energy cosmic ray flux.
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S
SECTOR BOUNDARY In the SOLAR WIND, the area of demarcation between sec-
tors, which are large-scale features distinguished by the
predominant direction of the interplanetary magnetic field,
toward or away from the sun.
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SHORT WAVE FADE (SWF) A particular ionospheric solar flare effect under
the broad category of sudden ionospheric disturbances (SIDs)
whereby short-wavelength radio transmissions, VLF, through
HF, are absorbed for a period of minutes to hours.
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SMOOTHED SUNSPOT NUMBER An average of 13 monthly RI numbers, centered on
the month of concern.
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SOLAR COORDINATES
Central Meridian Distance (CMD). The angular distance in solar
longitude measured from the central meridian.
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