<Title>Catalog details</title>
<H2>Catalog details</h2><p>
Ionospheric vertical incidence parameters are listed as the URSI two-digit code (foF2 is 00, M(3000)F2 is 03, etc., see parameter descriptions below).<p>
Daily values are listed as 'd' in the appropriate column for the month: JFMAMJJASOND.<p>
For example, Burmuda has foF2 (00) for October 1989 and November and December 1990 as well as M(3000)F2 (03) for the same period.
<pre>STATION NAME CODE TIME LAT LONG YEAR --------- CATALOG ------------
BERMUDA BJJ32 0 32.2 295.6 1989 00 d 03 d 04 d 07 d 10 d 16 d 20 d 24 d 30 d 34 d 42 d 51 d 80 d 81 d
BERMUDA BJJ32 0 32.2 295.6 1990 00 dd03 dd04 dd07 dd10 dd16 dd20 dd24 dd30 dd34 dd42 dd51 dd80 dd81 dd</pre><p><hr>
<pre>IONOSPHERIC VERTICAL INCIDENCE PARAMETERS
F Layer Parameters
Parameter # Dimension Description
foF2 00 .1 MHz F2 layer o-mode (ordinary)
critical frequency.
fxF2 01 .1 MHz F2 layer x-mode (extraordinary)
critical frequency.
fzF2 02 .1 MHz F2 layer z-mode critical
frequency.
M3000F2 03 .01 F2 layer M factor (the ratio of
the maximum usable frequency
divided by the critical
frequency).
h'F2 04 km F2 layer o-mode minimum virtual
height.
hpF2 05 km An estimate of the true height
of the F2 layer (measurement of
the ordinary mode virtual height
at a frequency of 83.4% of the
foF2).
h'Ox 06 km F layer minimum virtual height
of the x-mode trace at a
frequency equal to the foF2.
MUF3000F2 07 .1 MHz F2 layer maximum usable
frequency for a 3000km path.
hc 08 km The height of the maximum
obtained by fitting a
theoretical h'F curve for the
parabola of best fit to the
observed ordinary mode trace
near foF2 and correcting for
under-lying ionization.
qc 09 km F layer scale height.
foF1 10 .01 MHz F1 layer o-mode critical
frequency.
fxF1 11 .01 MHz F1 layer x-mode critical
frequency.
M3000F1 13 .01 MHz F1 layer M factor (see code 03).
h'F1 14 km F1 layer o-mode minimum virtual
height.
h'F 16 km F layer o-mode minimum virtual
height.
MUF3000F1 17 .1 MHz F1 layer maximum usable
frequency (see code 07).
------------------------------------------------------------
E Layer Parameters
Parameter # Dimension Description
foE 20 .01 MHz E layer o-mode critical
frequency.
foE2 22 .01 MHz E2 layer o-mode critical
frequency (when it occurs it is
between the normal E and F1
layers).
h'E 24 km E layer o-mode minimum virtual
height.
h'E2 26 km E2 layer o-mode minimum virtual
height.
------------------------------------------------------------
Es Layer Parameters
Parameter # Dimension Description
foEs 30 .1 MHz Es layer highest o-mode
frequency at which a mainly
continuous Es trace is observed.
fxE 31 .1 MHz Es layer highest x-mode
frequency at which a mainly
continuous Es trace is observed.
fbEs 32 .1 MHz The blanketing frequency of
layer used to derive foEs.
ftEs 33 .1 MHz Top frequency of the Es trace
(any mode).
h'Es 34 km The minimum virtual height of
the layer used to derive foEs.
Type Es 36 A characterization of the shape
of the Es trace.
------------------------------------------------------------
Other Parameters
Parameter # Dimension Description
foF1.5 40 .01 MHz The o-mode critical frequency of
the F1.5 intermediate
stratification (between F1 and F2)
fmin 42 .1 MHz The lowest frequency at which an
o-mode echo is observed on the
ionogram.
M3000F1.5 43 .01 MHz F1.5 layer M factor (see code 03).
h'F1.5 44 km F1.5 layer o-mode minimum
virtual height.
fm2 47 .1 MHz The fmin for the second order
o-mode trace.
hm 48 km The height of the maximum
electron density of the F2 layer
calculated by the Titheridge
method.
fm3 49 .1 MHz The fmin for the third order
o-mode trace.
------------------------------------------------------------
Spread E/Oblique Parameters
Parameter # Dimension Description
foI 50 .1 MHz The highest o-mode frequency of
spread F.
fxI 51 .1 MHz The highest frequency of spread
F traces (any mode).
fmI 52 .1 MHz The lowest o-mode frequency at
which spread traces are observed
for the F layer.
M3000I 53 .01 MHz M Factor deduced from upper
frequency edge of spread traces
and fxI (see code 03).
h'I 54 km Minimum slant range of the
spread F trace.
dfs 57 .1 MHz Frequency range of the spread.
------------------------------------------------------------
N(h) Parameters
Parameter # Dimension Description
fh'F2 60 .1 MHz The frequency at which h'F2 is
measured.
fh'F 61 .1 MHz The frequency at which h'F is
measured.
h'mF1 63 km The maximum virtual height in
the o-mode F1 cusp.
h1 64 km True height at f1 Titheridge
method.
h2 65 km True height at f2 Titheridge
method.
h3 66 km True height at f3 Titheridge
method.
h4 67 km True height at f4 Titheridge
method.
h5 68 km True height at f5 Titheridge
method.
H 69 km Effective scale height at hmF2
Titheridge method.
------------------------------------------------------------
REFERENCE: Definition of Characteristic extracted from
UAG23 (URSI Handbook of Ionogram Interpretation and
Reduction, November, 1972)</pre>