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Hourly values of parameter foF2
(F2 layer critical frequency)

The description of letters in the tables of parameter foF2

A blanketing.
B absorption.
C non-ionospheric (equipment).
D above upper frequency range of equipment.
E below lower frequency range of equipment.
F frequency spread.
G ionization density too small.
H stratification.
K particle E layer.
L no sufficiently defined cusp between F layers.
M mode uncertain.
N superimposed layers.
O measurement refers to o component.
P man-made perturbation of parameters.
Q range spread.
R attenuation near critical frequency.
S interference.
T interpolated.
V forked trace.
W above height range.
X measurement refers to x component.
Y lacuna (tilt).
Z measurement refers to z component.