+ (2 - 2H + J) * M + K * Omega
This sign multiplies the quantity
GLOBAL SET
----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
ETIDES +1101 010 -0.033 0.0 10. 10.
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
COLUMNS FORMAT DESCRIPTION DEFAULT VALUE & UNITS
1-6 A6 ETIDES - Requests application and/or
adjustment of earth tides. There are Colombo Model
two Earth Tide models available in
GEODYN. First implemented was the
Colombo tide model and unnormalized
Legendre polynomials. M and K
symmetry is NOT included.
The presence of a RAYTID option
before the ETIDES cards invoques the
IERS convention Earth Tides. Immediately
following there is a description of the
Colombo model. At the end of this page
there will be a descrption of the IERS
model.
9 I1 Indicates form of input coefficients. 0
0 = A and B coefficients. [NOTE 1]
10 I1 Indicates form of input sigmas. 0
0 = A and B coefficients [NOTE 1]
15-17 I3 Sign (+1 or -1) of the Demos Number [NOTE 2] +1
-((2 -H) * + (2 - 2H + J) * M + K * Omega
This sign multiplies the quantity
18-20 I3 MKH expansion arguments of the 0
Demos number. [NOTE 2]
M = 0,1,2
K = 0,1,2
H = 0,1,2
21-22 I2 "J" expansion argument of Demos number. 0
-9. LE. J .LE. 9 [NOTE 2]
23 I1 Indicates form of tidal amplitude
coefficient [ V (t) / V bar ] [NOTE 3] 0
f f
0 = only main line, fixed coefficient
1 = main line and sidebands, variable
coefficient
2 = only main line, variable coefficient
24 I1 Disturbing Body (B). [NOTE 2] 0
0 = Moon and Sun
1 = Moon
2 = Sun
25-44 D20.8 "A" coefficient. [NOTE 1] 0. M
45-59 D15.3 "B" coefficient. [NOTE 1] 0. M
60-72 D13.1 Sigma "A". 0. M
73-80 D8.2 Sigma "B". 0. M
NOTES:
[1] The "A" and "B" coefficients are related to amplitude and phase
by the following formulas:
A = K2 Love Number * cos(phase)
B = -K2 Love Number * sin(phase)
[2] The "Demos Number" is given by:
Demos Number = IDSIGN*(MKH*1000+(J+10)*10+B)
[3] There are 4 recognized main tidal lines and 16
associated sidebands. Their Demos numbers are:
SMKH JB (See last page for S M K H J B definitions)
Main Line 1: 1120 01
Side Bands: -1112 01, 1100 01, 1110 01, -1111 -21,
1101 21, 1111 21, 1121 21
Main Line 2: 1120 02
Side Bands: 1101 22
Main Line 3: 1220 01
Side Bands: 1201 21, 1210 01, 1211 21, 1200 01,
-1212 01, -1211 -21, 1221 21
Main Line 4: 1220 02
Side Bands: 1201 22
IERS EARTH TIDE MODEL
----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
ETIDES
----+----0----+----0----+----0----+----0----+----0----+----0----+----0----+----0
COLUMNS FORMAT DESCRIPTION DEFAULT VALUE & UNITS
1-6 A6 ETIDES - Requests application and/or
adjustment of IERS convention earth tides .
9 I1 Forcing degree in tide operating potential
(2 or 3). The order is the first integer in
the Doodson number given in columns 18-24.
10 I1 Inteder number [0,...,3] gives phase increment
after x{pi/2}. Useful when all tides use cosine
factors with positive amplitudes.
15-17 I3 Integer Flag:
=0 no sidelines
=1 turn n sidelines with input
tidal constituent.
=2 turn n sidelines with input
tidal group.
18-24 I7 Doodson Number (six positive integers)
25-44 D20.8 "A" coefficient. 0. M
45-59 D15.3 "B" coefficient. 0. M
60-72 D13.1 Sigma "A". 0. M
73-80 D8.2 Sigma "B". 0. M
UNITS: KM =Kilometers; M =Meters ; S =Seconds ; Kg =Kilograms
DEG=Degrees ; RAD=Radians ; AS =Arc seconds; MAS=Milli-arc seconds
IF CARD OMITTED: The expanded earth tide model is not used. See TIDES card for
tide model that will be used.