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Glossary of Solar Terrestrial Terms
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|
Central Meridian
The north-south meridian of the Sun that passes through the centre
of the disc as viewed from the Earth.
Chromosphere
"Colour sphere" or layer of the Sun's atmosphere between the photosphere and the corona. Appears
as a red ring around the solar limb during a solar eclipse. Plage regions are visible in
the chromosphere, usually overlying sunspot groups. EUV radiation is produced in plage.
Circuit
In an IPS HF prediction, this is the name used to designate communications between two locations,
e.g., Sydney-London.
Core
The region of very high density and temperature located at the centre of the Sun.
Corona
The outer atmosphere of the Sun with low density and high temperature. Visible as an
extended bright region about the Sun during solar eclipses.
Coronal Hole
A low density region of the corona with relatively low temperature. Coronal
holes are the sources of high speed solar wind streams.
Coronal Mass Ejection
An ejection of material from the Sun into interplanetary space. If the material is
directed towards the Earth then the event may result in a disturbance to the
Earth's magnetic field and ionosphere.
Critical Frequency
The highest frequency that can be reflected vertically from an ionospheric layer.
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Educational