Directory: | ./ |
---|---|
File: | phys/iniorbit.f90 |
Date: | 2022-01-11 19:19:34 |
Exec | Total | Coverage | |
---|---|---|---|
Lines: | 31 | 31 | 100.0% |
Branches: | 4 | 6 | 66.7% |
Line | Branch | Exec | Source |
---|---|---|---|
1 | 5 | SUBROUTINE iniorbit(paphelie, pperiheli, pyear_day, pperi_day, pobliq) | |
2 | IMPLICIT NONE | ||
3 | |||
4 | ! ======================================================================= | ||
5 | |||
6 | ! Auteur: | ||
7 | ! ------- | ||
8 | ! Frederic Hourdin 22 Fevrier 1991 | ||
9 | |||
10 | ! Objet: | ||
11 | ! ------ | ||
12 | ! Initialisation du sous programme orbite qui calcule | ||
13 | ! a une date donnee de l'annee de duree year_day commencant | ||
14 | ! a l'equinoxe de printemps et dont le perihelie se situe | ||
15 | ! a la date peri_day, la distance au soleil et la declinaison. | ||
16 | |||
17 | ! Interface: | ||
18 | ! ---------- | ||
19 | ! - Doit etre appele avant d'utiliser orbite. | ||
20 | ! - initialise une partie du common planete.h | ||
21 | |||
22 | ! Arguments: | ||
23 | ! ---------- | ||
24 | |||
25 | ! Input: | ||
26 | ! ------ | ||
27 | ! aphelie \ aphelie et perihelie de l'orbite | ||
28 | ! periheli / en millions de kilometres. | ||
29 | |||
30 | ! ======================================================================= | ||
31 | |||
32 | ! ----------------------------------------------------------------------- | ||
33 | ! Declarations: | ||
34 | ! ------------- | ||
35 | |||
36 | include "planete.h" | ||
37 | include "YOMCST.h" | ||
38 | |||
39 | ! Arguments: | ||
40 | ! ---------- | ||
41 | |||
42 | REAL paphelie, pperiheli, pyear_day, pperi_day, pobliq | ||
43 | |||
44 | ! Local: | ||
45 | ! ------ | ||
46 | |||
47 | REAL zxref, zanom, zz, zx0, zdx, pi | ||
48 | INTEGER iter | ||
49 | |||
50 | ! ----------------------------------------------------------------------- | ||
51 | |||
52 | pi = 2.*asin(1.) | ||
53 | |||
54 | 1 | aphelie = paphelie | |
55 | 1 | periheli = pperiheli | |
56 | 1 | year_day = pyear_day | |
57 | 1 | obliquit = pobliq | |
58 | 1 | peri_day = pperi_day | |
59 | |||
60 | 1 | PRINT *, 'Perihelie en Mkm ', periheli | |
61 | 1 | PRINT *, 'Aphelie en Mkm ', aphelie | |
62 | 1 | PRINT *, 'obliquite en degres :', obliquit | |
63 | 1 | PRINT *, 'Jours dans l annee : ', year_day | |
64 | 1 | PRINT *, 'Date perihelie : ', peri_day | |
65 | 1 | unitastr = 149.597870 | |
66 | 1 | e_elips = (aphelie-periheli)/(periheli+aphelie) | |
67 | 1 | p_elips = 0.5*(periheli+aphelie)*(1-e_elips*e_elips)/unitastr | |
68 | |||
69 | 1 | PRINT *, 'e_elips', e_elips | |
70 | 1 | PRINT *, 'p_elips', p_elips | |
71 | |||
72 | ! ----------------------------------------------------------------------- | ||
73 | ! calcul de l'angle polaire et de la distance au soleil : | ||
74 | ! ------------------------------------------------------- | ||
75 | |||
76 | ! calcul de l'zanomalie moyenne | ||
77 | |||
78 | 1 | zz = (year_day-pperi_day)/year_day | |
79 | 1 | zanom = 2.*pi*(zz-nint(zz)) | |
80 | 1 | zxref = abs(zanom) | |
81 | 1 | PRINT *, 'zanom ', zanom | |
82 | |||
83 | ! resolution de l'equation horaire zx0 - e * sin (zx0) = zxref | ||
84 | ! methode de Newton | ||
85 | |||
86 | 1 | zx0 = zxref + r_ecc*sin(zxref) | |
87 |
1/2✓ Branch 0 taken 3 times.
✗ Branch 1 not taken.
|
3 | DO iter = 1, 100 |
88 | 3 | zdx = -(zx0-r_ecc*sin(zx0)-zxref)/(1.-r_ecc*cos(zx0)) | |
89 |
2/2✓ Branch 0 taken 1 times.
✓ Branch 1 taken 2 times.
|
3 | IF (abs(zdx)<=(1.E-12)) GO TO 120 |
90 | 3 | zx0 = zx0 + zdx | |
91 | END DO | ||
92 | 120 CONTINUE | ||
93 | 1 | zx0 = zx0 + zdx | |
94 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 1 times.
|
1 | IF (zanom<0.) zx0 = -zx0 |
95 | 1 | PRINT *, 'zx0 ', zx0 | |
96 | |||
97 | ! zteta est la longitude solaire | ||
98 | |||
99 | 1 | timeperi = 2.*atan(sqrt((1.+r_ecc)/(1.-r_ecc))*tan(zx0/2.)) | |
100 | 1 | PRINT *, 'longitude solaire du perihelie timeperi = ', timeperi | |
101 | |||
102 | 1 | RETURN | |
103 | END SUBROUTINE iniorbit | ||
104 |