By Gunter Nitschke
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Plate 2. Evolution of the total daily solar radiation in several locations through the months of the year: Almeria (Spain), Bogota (Colombia), Mexico and De Bilt (The Netherlands). 91383 Castilla Plates_Layout 1 22/11/2012 18:39 Page 2 30 30 25 25 20 20 15 15 10 10 5 5 0 0 Temperature (°C) Radiation (MJ m–2 day–1) 3 J F M A M J J A S O N D J F M A M J J A S O N D Months Radiation Temperature 4 0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 Dec Nov Oct Sep Aug Jul Jun May Apr Mar Feb Jan Time (h) 4–6 ms–1 2–4 ms–1 0–2 ms–1 Plate 3.
On the Mediterranean coast, its role is important in the ageing of plastic materials and for plant morphogenesis (Raviv, 1988). It amounts to 2–4% of the energy of the global radiation. The UV radiation may be subdivided into UV-A (higher than 320 nm) which is the one that tans the skin, UV-B (from 290 to 320 nm) responsible of the skin cancer and UV-C (from 200 to 290 nm) potentially dangerous but absorbed (Fig. 11) almost completely by the ozone layer (Monteith and Unsworth, 1990). Visible radiation to the human eye, from 380 (violet-blue) to 780 nm (red).
1. The inclination of the Earth’s axis of rotation with respect to the Earth’s orbital plane. N Spring equinox 21 March Winter solstice 22 December Summer solstice 21 June N N S Night Sun Day N S S Day Night S Autumn equinox 23 September Fig. 2. The year’s seasons in the path of the Earth’s orbit around the Sun. 3 Day Length The astronomic duration of the day throughout the year is variable, and the degree of variability is proportional to the latitude of the locality. The astronomic day is the period between sunrise and sunset, sunrise being the moment at which the solar disc appears on the horizon and sunset the moment at which it disappears.