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|
Obliquity Factor
The factor that relates the vertical critical frequency to the MUF for an
HF circuit. It is denoted by M(D)layer, where D is the path length of the circuit and layer
indicates which ionospheric region is being considered, i.e., E, F1 or F2. This factor increases
with increasing path length so longer circuits will normally use higher frequencies.
Optimum Working Frequency
This is a statistical prediction of the highest frequency for HF sky wave propagation. If the
prediction is correct, this frequency should be refracted by the ionosphere 90% of the time.
See Maximum Usable Frequency and Upper Decile MUF.
Ordinary Wave
The radio wave that follows the laws of refraction when propagating in a plasma
containing a magnetic field. For the ordinary wave, the electric vector rotates in the
opposite direction to that of an electron gyrating in the field when propagation is along
the direction of the magnetic field. For propagation perpendicular to the magnetic field,
the electric vector oscillates parallel to the magnetic field.
OWF
See Optimum Working Frequency.
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Educational 
MAG: Normal
ION: Moderate