Synchronous flowering linked to changes in solar radiation intensity

Synchronous flowering linked to changes in solar radiation intensity.

Synchronous flowering of the rubber tree (Hevea brasiliensis) induced by high solar radiation intensity.

How tropical trees flower synchronously near the equator in the absence of significant day length variation or other meteorological cues has long been a puzzle. The rubber tree (Hevea brasiliensis) is used as a model to investigate this phenomenon. The annual cycle of solar radiation intensity is shown to correspond closely with the flowering of the rubber tree planted near the equator and in t...

Daily tropical cyclone intensity response to solar ultraviolet radiation

[1] An inverse relationship between hurricane activity over the Caribbean and the number of sunspots has recently been identified. Here we investigate this relationship using daily observations and find support for the hypothesis that changes in ultraviolet (UV) radiation rather than changes in other concomitant solar and cosmic variations are the cause. The relationship is statistically signif...

Changes in the Solar Constant of Radiation

(1) Pettit, E. “Ultra-violet Solar Radiation.” Mount Wilson Contr., N ~ . 98. prp,.. Nat. Acad. sc., 13, 380-387, 1927. (2) Pettit, h. Measurements of Ultra-Violet Solar Radiation.” Mount Wilson Contr., No. 445; Astrophysical Jour., 75, 185-221, 1932. (3) .Davis, G. E. “Instruments for Radiometric and Radiobiological Investigations a t the Desert Sanatorium and Institute of Research, Tucson, Ar...

Do metabolic responses to solar radiation scale directly with intensity of irradiance?

Endotherms exposed to air temperatures below thermal neutrality reduce their metabolic heat production when exposed to sunlight. The physiological effects of this additional source of heat gain from the environment usually are assumed to be proportional to the intensity of irradiance if other factors are held constant. We test this assumption by measuring changes in metabolic heat production pr...