source:
palm/trunk/UTIL/chemistry/gasphase_preproc/kpp/util/UpdateSun.m
| Last change on this file was 2696, checked in by kanani, 6 years ago | |
|---|---|
| File size: 433 bytes | |
| Line | |
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| 1 | function Update_SUN( ) |
| 2 | |
| 3 | global TIME SUN |
| 4 | |
| 5 | SunRise = 4.5; |
| 6 | SunSet = 19.5; |
| 7 | Thour = TIME/3600.; |
| 8 | Tlocal = Thour - floor(Thour/24)*24; |
| 9 | |
| 10 | if ( (Tlocal>=SunRise) & (Tlocal<=SunSet) ) |
| 11 | Ttmp = (2.0*Tlocal-SunRise-SunSet)/(SunSet-SunRise); |
| 12 | if (Ttmp>0) |
| 13 | Ttmp = Ttmp*Ttmp; |
| 14 | else |
| 15 | Ttmp = -Ttmp*Ttmp; |
| 16 | end |
| 17 | SUN = ( 1.0 + cos(pi*Ttmp) )/2.0 ; |
| 18 | else |
| 19 | SUN = 0.0; |
| 20 | end |
| 21 | |
| 22 | return % Update_SUN |
| 23 |
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