Adéu a Nihil Obstat | Hola a The Catalan Analyst

Després de 13 anys d'escriure en aquest bloc pràcticament sense interrumpció, avui el dono per clausurat. Això no vol dir que m'hagi jubilat de la xarxa, sinó que he passat el relleu a un altra bloc que segueix la mateixa línia del Nihil Obstat. Es tracta del bloc The Catalan Analyst i del compte de Twitter del mateix nom: @CatalanAnalyst Us recomano que els seguiu.

Moltes gràcies a tots per haver-me seguit amb tanta fidelitat durant tots aquests anys.

dimarts, 2 de setembre de 2008

Refredament climàtic

Tot un mes sense una sola taca solar (Font: Solar and Heliospheric Observatory (SOHO)Per primera vegada en cent anys, durant tot un mes no han aparegut taques solars en el sol. En un mil·leni, la terra ha enregistrat tres períodes amb desaparició total de taques solars. Aquests períodes es van caracteritzar per un refredament ràpid del clima, fins el punt que en un dels casos va derivar en una petita era glacial. La informació la publica el “DailyTech”.

The sun has reached a milestone not seen for nearly 100 years: an entire month has passed without a single visible sunspot being noted.

The event is significant as many climatologists now believe solar magnetic activity – which determines the number of sunspots -- is an influencing factor for climate on earth.

According to data from Mount Wilson Observatory, UCLA, more than an entire month has passed without a spot. The last time such an event occurred was June of 1913. Sunspot data has been collected since 1749.

When the sun is active, it's not uncommon to see sunspot numbers of 100 or more in a single month. Every 11 years, activity slows, and numbers briefly drop to near-zero. Normally sunspots return very quickly, as a new cycle begins.

But this year -- which corresponds to the start of Solar Cycle 24 -- has been extraordinarily long and quiet, with the first seven months averaging a sunspot number of only 3. August followed with none at all. The astonishing rapid drop of the past year has defied predictions, and caught nearly all astronomers by surprise.
In 2005, a pair of astronomers from the National Solar Observatory (NSO) in Tucson attempted to publish a paper in the journal Science. The pair looked at minute spectroscopic and magnetic changes in the sun. By extrapolating forward, they reached the startling result that, within 10 years, sunspots would vanish entirely. At the time, the sun was very active. Most of their peers laughed at what they considered an unsubstantiated conclusion.

The journal ultimately rejected the paper as being too controversial.

Ja ho veuen, vinga esperar l’escalfament climàtic però acabem amb els peus congelats.