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"Missing" Moon Linked To Major 1761 Eruption? - UPDATE

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Author Topic: "Missing" Moon Linked To Major 1761 Eruption? - UPDATE  (Read 112 times)
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« on: January 20, 2009, 10:14:59 am »

Finding a Culprit

A good candidate for the cause of the 1761 events is the Makian volcano on the Indonesian island of Halmahera, Pang thinks. Records show that this volcano experienced a series of eruptions beginning in September of 1760 and lasting until spring of the following year.

Makian's equatorial position could explain why evidence of its eruption was found at both poles.

But it's also possible the culprit volcano went unrecorded, Pang added.

Richard Keen is a climatologist at the University of Colorado in Boulder who was not involved in the study.

"[Pang] is absolutely correct in saying that volcanoes can darken a lunar eclipse," Keen said. But for the 1761 event, he noted, historical accounts about the dimness of the moon varied by geographical location.

Most of the reports of the moon disappearing were from astronomers in Sweden, Finland, and northwestern Russia. At more southern latitudes, the moon only appeared dimmer than usual.

The differing accounts could be due to the patchy distribution of dust and sulfur particles that occurs shortly after a volcanic eruption, said Fred Espenak, an eclipse expert at NASA's Goddard Space Flight Center in Maryland.

"But if this dust is up there long enough, it tends to uniformly distribute itself over weeks or months," said Espenak, who also did not participate in the research.

Espenak witnessed a modern dimming of the moon during a total lunar eclipse in 1992. That event was also probably due to a volcano, he said.

"It was here in Maryland, but the volcano was Mount Pinatubo in the Philippines the year before."

Michael Baillie, a paleoecologist at Queen's University Belfast in the U.K., said Pang's claim is "very interesting and indeed plausible," but he questioned the scientific usefulness of using lunar eclipses to pinpoint historic volcanic eruptions.

Pang is "almost intimating that we should be able to look at very black eclipses and assess that volcanoes have gone off," Baillie said.

"But it's always going to be a patchy thing. If someone didn't see an eclipse, is that because it was obscured [by volcanic smog] or because it was cloudy that night?"
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