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Richardfrado

18 Aug 2024 - 04:29 pm

Johannes Kepler thought he sketched Mercury orbiting across the sun. What he actually captured has solved a solar mystery
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German astronomer Johannes Kepler made sketches of sunspots in 1607 from his observations of the sun’s surface — and centuries later, the pioneering drawings are helping scientists solve a solar mystery.

Even though everything in the solar system revolves around the sun, scientists have yet to unlock many of the star’s secrets.
However, studying the variability of the sun over time, including the solar cycle, could answer some of the most longstanding questions about the fiery orb and how it changes.
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Some of those questions revolve around solar activity in the 17th century, which was a pivotal time for studying the sun.

Astronomers observed sunspots with telescopes for the first time in 1610. At the same time, the sun was making an unusual transition into an extended period of weakened activity. And Kepler’s long disregarded sketches, overlooked because they were drawings rather than telescopic observations, could provide crucial historical insights.

A new study that recreates the circumstances during which Kepler made his drawings appeared on July 25 in The Astrophysical Journal Letters.

“Kepler contributed many historical benchmarks in astronomy and physics in the 17th century, leaving his legacy even in the space age,” said lead study author Hisashi Hayakawa, assistant professor at Nagoya University’s Institute for Space-Earth Environmental Research, in a statement.

“Here, we add to that by showing that Kepler’s sunspot records predate the existing telescopic sunspot records from 1610 by several years. His sunspot sketches serve as a testament to his scientific acumen and perseverance in the face of technological constraints.”

The sun’s tumultuous activity
The sun experiences an 11-year cycle of waxing and waning activity, known as the solar cycle. Currently, scientists believe that the sun is reaching or nearing solar maximum, the annual peak of its activity for the current solar cycle, called Solar Cycle 25.

Solar maximum is typically associated with an increase in the number of sunspots visible on the sun’s surface. These dark regions, some of which can reach the size of Earth or larger, are driven by the sun’s strong and constantly shifting magnetic fields.

Today, scientists track solar activity using data from ground and space-based observatories, magnetic maps of the solar surface, and ultraviolet observations of the sun’s outer atmosphere.

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Richardplugs

18 Aug 2024 - 12:37 pm

A chainsaw amnesty is protecting the rainforest in Borneo
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Borneo was once covered in lush, dense rainforests, but they are rapidly disappearing. The Southeast Asian island, roughly three times the size of the UK, has lost half its forest cover since the 1930s, destroying precious habitat for wildlife such as the critically endangered orangutan, as well as valuable carbon stores.

A non-profit called Health in Harmony (HIH) is asking farmers to hand in their chainsaws in return for money, and a chance to set up an alternative livelihood.

Borneo is divided between Indonesia, Malaysia and Brunei, and it is estimated that up to 10% of its land is taken up by industrial palm oil and logging operations. But deforestation isn’t just about large-scale tree clearance; some of those behind the logging are small-scale farmers, cutting trees as a sideline to make ends meet.

Buyback and healthcare
HIH launched its chainsaw buyback scheme in 2017, under the group’s Indonesian name, Alam Sehat Lestari (ASRI). Farmers who illegally log and sell the wood to timber companies are given around $200 for their chainsaws, as well as up to $450 in financial support for them to set up an alternative, sustainable livelihood, such as opening a shop, organic farming and even beekeeping.

The scheme also involves addressing the root causes of the problem. According to HIH, many of the farmers who turn to logging do so because they need the money for basics like healthcare.

“They live far from the healthcare clinics, and they see logging as a place where they can get quick cash,” explained Mahardika “Dika” Putra, conservation program manager at HIH. “If they need this amount of money, they cut this amount of trees.

“We asked what solutions they think they need to live in harmony with the forest and they said, ‘high quality, affordable healthcare, and training in organic farming.’”

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