วันพฤหัสบดี, 25 เมษายน 2024, 9:32AM
เว็บไซต์: Moodle - Open-source learning platform | Moodle.org
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อภิธานศัพท์: อภิธานศัพท์ฟิสิกส์ (อวกาศ)
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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