Sun and climate change

1994/06/01 Elhuyar Zientzia Iturria: Elhuyar aldizkaria

Today we know that the Sun is a variable star and that the spots appear and disappear.

The bustle was shocked when astrophysicist Sally Baliunas of Haward-Smithsonian explained the findings of the study on stars on climate change. Mr. Baliunas has renewed its old debate because it has said that the main cause of the greenhouse effect is the Sun (and not methane or CO2 gas).

Today we know that the Sun is a variable star, that is, that in its activity it has cycles of eleven years and that the spots appear and disappear. When the Sun is the most active in these cycles, the outer atmosphere contracts and is then when it emits most of the energy. Danish researchers Eigil Friis-Christensen and Knud Lassen said in 1991 that these periodic changes heat our planet. They then said that the temperature of the northern hemisphere of Earth increased or decreased depending on the appearance or disappearance of sunspots.

The astrophysicist Baliunas has also drawn similar conclusions by investigating stars similar to the Sun. In these stars, every 10-15 years there are cycles like the Sun. One of them was also three times brighter in a cycle. What would happen if the Sun passed so much?

Gai honi buruzko eduki gehiago

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