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
G |
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H |
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H-ALPHA This ABSORPTION LINE of neutral hydrogen falls in the red part of >
the visible spectrum and is convenient for solar observations.
The H-alpha line is universally used for patrol observations of
solar flares.
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H-component of the Geomagnetic Field See GEOMAGNETIC ELEMENTS.
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HIGH ENERGY EVENT Flares (class two or more) with outstanding Centimetric
Bursts and SID. High Energy Protons are reported at the Earth in
case of most of these events occurring on the western part of solar
disk. (Class X flares)
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HIGH FREQUENCY (HF) That portion of the radio frequency spectrum between
between 3 and 30 MHz.
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HIGH LATITUDES With specific reference to zones of geomagnetic activity,
"high latitudes" refers to 50o to 80o geomagnetic.
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HIGH-SPEED STREAM A feature of the SOLAR WIND having velocities that are
about double average solar wind values.
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HOMOLOGOUS FLARES Solar flares that occur repetitively in the same
ACTIVE REGION, with essentially the same position and with a common
pattern of development.
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HYDER FLARE A FILAMENT-associated TWO-RIBBON FLARE, often occurring in
spotless regions. The flare presumably results from the impact
on the CHROMOSPHERE of infalling FILAMENT material.
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I |
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INTERPLANETARY MAGNETIC FIELD (IMF) The magnetic field carried with the
SOLAR WIND.
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IONOSPHERE The region of the earth's upper atmosphere containing a small
percentage of free electrons and ions produced by photoioniza-
tion of the constituents of the atmosphere by solar ultraviolet
radiation at very short wavelengths (l.t.1000 angstroms). The
ionosphere significantly influences radiowave propagation of fre-
quencies less than about 30 MHz.
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IONOSPHERIC STORM A disturbance in the F REGION of the IONOSPHERE, which
occurs in connection with geomagnetic activity.
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K |
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K 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 by electrons in the hot outer atmosphere of the sun.
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K INDEX A 3-hourly quasi-logarithmic local index of geomagnetic activity
relative to an assumed quiet-day curve for the recording site.
Range is from 0 to 9. The K index measures the deviation of the
most disturbed horizontal component.
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KELVIN A unit of absolute temperature.
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