Sunlight breaks down upon reaching the earth’s surface in various types of radiation according to wavelength, are classified as ultraviolet radiation, visible radiation and infrared. In turn, ultraviolet radiation can be UVC, UVB or UVA. UVC rays have the shortest wavelength, are the most energy and therefore more capable of burns, but are retained by the ozone layer. Thus the reduction or the existence of holes in the ozone layer is so dangerous.

UVB rays as well as the heating effect (which causes the redness or Erythema of the skin when exposed to sunlight), penetrate the epidermis and stimulate the melanocytes (skin cells that produce melanin, the substance that gives the brown color to the skin).

UVA rays are the most penetrating the skin and are the cause of skin aging and melanoma (skin cancer).

Besides the type of radiation, it is necessary to know the factors influencing the action of sunlight on the skin. Thus, we must bear in mind that, how much higher the geographical area where we are, the more intense the exposure, the obliquity of the rays of the sun and the earth also influences, depending on the season, time of day and the latitude of the geographical area. The climate also influences, as the rain and clouds absorb some radiation. Also the type of area where we are, because the snow reflects up to 85% of the rays, and the dry sand to 17%.

Random Posts

• Choosing Foods and Lose Weight
  Choosing foods and lose weight. Choose foods in the diet is essential to maintaining weight loss health. For glucidic foods have to be careful about...
• Allergies to Food?
  We all think that food is good for health and its consumption should not cause any abnormal reaction. But the reality of many people in the world, who...
• The Professional P90X2 Program Adds Depth
  P90X2 focuses on the lean side of things and keeping you trim. You can exercise all you want to build muscle and mass but the difference that P90X 2 c...
• A Daily Intake of Prenatal Vitamin is recommended
  Vitamins are classified as either water-soluble or fat-soluble. Water-soluble vitamins include vitamin C and the B-complex vitamins. They are absorbed...
• Hemochromatosis
  Hemochromatosis is a genetic disorder (inherited) in which the gut absorbs too much iron. Excess iron is deposited in tissues and organs, where they c...