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URSI Ionospheric Parameter Codes

URSI Ionospheric Parameter Codes
Source: Rutherford Appleton Laboratories.

The definitions of the parameters have been extracted from UAG23 (URSI Handbook of Ionogram Interpretation and Reduction, November, 1972).
The definitions of the parameters for Codes 70-89, 93-99, and A0-D2 have been included from ulcar.uml.edu

F Layer Parameters

ParameterCodeDimensionDescription
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 minmum virual height of the
x-mode trace at a frequency equal to
the foF2.
MUF3000F2 07 .1 MHz F2 layer maximum usable frequency for
3000km path.
hc 08 km The height of the maximum obtained by
fitting a theorectical h'F curve for the
parabola of best fit to the observed
ordinary mode trace near foF2 and
correcting for under-lying ionizaton.
qc 09 km EF 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 virual height.
MUF3000F1 17 .1 MHz F1 layer maximum usable frequency(see
code 07).

E Layer Parameters

ParameterCodeDimensionDescription
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 minmum virual height.
h'E2 26 km E2 layer o-mode minimum virtual height.

Es Layer Parameters

ParameterCodeDimensionDescription
foEs 30 .1 MHz Es layer hightest o-mode frequency are
which a mainly continuous Es trace is
observed.
fxE 31 .1 MHz Es layer highest x-mode frequency are
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 minimim virtual height of the layer
used to derive foEs.
Type of Es 36   A characterization of the shape of
Es trace.

Other Parameters

ParameterCodeDimensionDescription
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 whcih 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 later calculated by
the Titheridge method.
fm3 49 .1 MHz The fmin for the third order o-mode
trace.

Spread E/Oblique Parameter

ParameterCodeDimensionDescription
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.
M30001 53 .01 MHz M Factor deduces 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) Titheridge

ParameterCodeDimensionDescription
fh'F2 60 .1 MHz Thse 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 virula 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 .01 MHz True height at f3 Titheridge method.
h4 67 .01 MHz 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.

T.E.C.

ParameterCodeDimensionDescription
I2000 70 1016 e/m2 Ionospheric electron content
Faraday technique.
I 71 1016 e/m2 Total electron content to
geostationary satellite.
I1000 72 1016 e/m2 Ionospheric electron content to height
100 km using Digisonde technique.
T 79 1016 e/m2 Total sub-peak content.
Titheridge method.

Other 2

ParameterCodeDimensionDescription
FMINF 80 .1 MHz Minimum frequency of E trace (50 kHz
increments)Equals fbEs when E present.
FMINE 81 .1 MHz Minimum frequency of E trace (50 kHz
increments).
HOM 82 km Parabolic E layer peak height.
yE 83 km Parabolic E layer semi-thickness.
QF 84 km Average range spread of F trace.
QE 85 km Average range spread of E trace.
FF 86 .01 MHz Frequency spread between fxF2 and fxI.
FE 87 .01 MHz As FF but considered beyond foE.
fMUF3000 88 .01 MHz MUF (D) /obliquity factor.
h'MUF3000 89 km Virtual height at fMUF.

N(h)

ParameterCodeDimensionDescription
hmE (zmE) 90 km True height of E-layer, ??? method.
hmF1 (zmF1) 91 km True height of F1 peak, ??? method.
hmF2 (zmF2) 92 km True height of F2 peak, ??? method.
zhalfNm 93 km True height at half peak electron density.
yF2 94 km Parabolic F2 layer semi-thickness.
yF1 95 km Parabolic F1 layer semi-thickness.

Digisonde profile, F2 layer

ParameterCodeDimensionDescription
[A0F2] A0 km Coefficient A0, truncated to integer km.
<A0F2> A1 m A0 - [A0], truncation reminder.
[A1F2] A2 km Coefficient A1.
<A1F2> A3 m A1 - [A1].
[A2F2] A4 km Coefficient A2.
<A2F2> A5 m A2 - [A2].
[A3F2] A6 km Coefficient A3.
<A3F2> A7 m A3 -[A3.]
[A4F2] A8 km Coefficient A4.
<A4F2> A9 m A4 - [A4].
[fsF2] AA MHz starting frequency of the layer, truncate.
<fsF2> AB kHz fs - [fs].
[fmF2] AC MHz ending frequency fm.
<fmF2> AD kHz fm - [fm].
[hmF2] AE km peak height, truncated.
<hmF2> AF m hm - [hm].
EppF2 AG 0.1 km error per point an average mismatch
of original h'(f) trace and the trace
reconstructed from the calculated profiles.

Digisonde profile, F1 layer

ParameterCodeDimensionDescription
[A0F1] B0 km Coefficient A0, truncated to integer km.
<A0F1> B1 m A0 - [A0], truncation reminder.
[A1F1] B2 km Coefficient A1.
<A1F1> B3 m A1 - [A1].
[A2F1] B4 km Coefficient A2.
<A2F1> B5 m A2 - [A2].
[A3F1] B6 km Coefficient A3.
<A3F1> B7 m A3 -[A3].
[A4F1] B8 km Coefficient A4.
<A4F1> B9 m A4 - [A4].
[fsF1] BA MHz starting frequency of the layer, truncate.
<fsF1> BB kHz fs - [fs].
[fmF1] BC MHz ending frequency fm.
<fmF1> BD kHz fm - [fm].
[hmF1] BE km peak height, truncated.
<hmF1> BF m hm - [hm].
EppF1 BG 0.1 km error per point an average mismatch
of original h'(f) trace and the trace
reconstructed from the calculated profiles.

Digisonde profile, E layer

ParameterCodeDimensionDescription
[A0E] C0 km Coefficient A0, truncated to integer km.
<A0E> C1 m A0 - [A0], truncation reminder.
[A1E] C2 km Coefficient A1.
<A1E> C3 m A1 - [A1.]
[A2E] C4 km Coefficient A2.
<A2E> C5 m A2 - [A2].
[W] C6 km Valley width [W], truncated.
<W> C7 m W - [W].
[D] C8 km Valley depth [D], truncated.
<D> C9 m D - [D].
[fsE] CA MHz starting frequency.
<fsE> CB kHz fs - [fs].
[fmE] CC MHz ending frequency.
<fmE> CD kHz fm - [fm].
[hmE] CE km peak height, truncated.
<hmE> CF m hm - [hm].
EppE CG 0.1 km error per point an average mismatch
of original h'(f) trace and the trace
reconstructed from the calculated profiles.
Valley ID CH   Valley Model ID.
B0 D0 km IRI Thickness parameter.
B1 D1 0.1 IRI Profile Shape parameter.
D1 D2 0.1 IRI Profile Shape parameter, F1 layer.

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