Posts Tagged ‘sun’
“The commonality between science and art is in trying to see profoundly – to develop strategies of seeing and showing”*…
Working with her scientist husband, Orra Hitchcock produced illustrations on bolts of linen that manifest original knowledge about extinction, stratigraphy, and their evidentiary features in the surrounding landscape– and trained eager young students to recognize and describe geological and natural-historical phenomena…
After meeting and falling in love with Edward Hitchcock, her employer at Massachusetts’ Deerfield Academy, Orra (née White) married him in 1821, beginning a lifetime of professional collaboration while raising a family amid piles of rocks and research tomes. Highly trained, white, and wealthy, she was far from an oddity in nineteenth-century education. Like many other women of her class, Hitchcock received extensive instruction in the arts and sciences, making a name by working alongside, not beneath, a man who had easier access to academic opportunities. Variously lauded as “an anomaly” and “the most remarkable” of their era, her scientific illustrations have rarely been considered on their own terms — admired for the natural historical and religious knowledge they contain — without being made an exemplar of the broader category of “women’s work”.
Moving to Amherst when Edward was appointed Professor of Chemistry and Natural History, the couple embarked on a decades-long exploration of the Connecticut River Valley’s botany and geology. While Edward lectured to eager young students about the principles of nature, from the depths of oceans to the granite veins of the earth, Orra produced more than sixty hand-colored scientific illustrations on poster-sized linen swaths designed to be hung on classroom walls.
Ranging from extinct mammals like Megatherium (a genus of giant ground sloth [below]) through lithic strata to fossilized footprints, the collection is striking for its modern abstraction, anticipating the later works of George Maw. Although some of Hitchcock’s geological illustrations seem far from “accurate” in their specificity (or lack thereof), her devotion to clear and concise visual communication bespeaks a deep-seated understanding of complex scientific principles…
An appreciation: “Orra White Hitchcock’s Scientific Illustrations for the Classroom (1828–40),” from @PublicDomainRev.
* Edward Tufte
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As we picture it, we might send sharply-observant birthday greetings to Cecilia Helena Payne-Gaposchkin; she was born on this date in 1900. An astrophysicist and astronomer, she was the first– in her Radcliffe (Harvard) PhD thesis in 1927– to apply the laws of atomic physics to the study of the temperature and density of stellar bodies: the first to conclude that hydrogen and helium are the two most common elements in the universe and the first to suggest that the Sun is primarily (99%) composed of hydrogen. During the 1920s, the accepted explanation of the Sun’s composition was a calculation of around 65% iron and 35% hydrogen. Her thesis adviser, astronomer Henry Norris Russell, reached a similar conclusion via his own observations several years later, and (while he made brief mention of Payne’s work) was for a time credited with the discovery. But in 1947, astronomer Fred Hoyle confirmed her original claim.
She spent her entire career at Harvard. In 1956 she became the first woman to be promoted to full professor from within the faculty at Harvard’s Faculty of Arts and Sciences. Later, with her appointment to the Chair of the Department of Astronomy, she also became the first woman to head a department at Harvard.
Her students included Helen Sawyer Hogg, Joseph Ashbrook, Paul W. Hodge, and Frank Drake (the creator of the Drake Equation)– all of whom made important contributions to astronomy.
“An imbalance between rich and poor is the oldest and most fatal ailment of all republics”*…
… so, how we measure it matters…
In 2015, Greece, Thailand, Israel, and the UK were equally unequal. That is, all four countries had the same Gini coefficient, a common measure of income inequality.
The number suggests that the spread of incomes in the four nations was the same. However, a close look at the poorest and wealthiest in those societies reveals a very different picture. The ratio between income held by the richest 10% and the poorest 10% ranged significantly, from 13.8 in Greece to 4.2 in the UK.
The fact is, just because the Gini coefficient is so well known doesn’t mean it’s a particularly useful measurement. Its appeal comes from its simplicity—a number between 0 and 1 that can encapsulate a complex distribution in a single figure—as well as its popularity. It is also regularly published and updated by powerful international organizations like the OECD, the World Bank, and the International Monetary Fund.
However, it has a number of serious limitations. So many, in fact, that the World Inequality Database, one of the world’s leading sources of income inequality data, steers clear. And it’s not alone. While some economists defend the Gini coefficient’s continued use, most agree that as a way to understand income inequality, it’s insufficient on its own…
A primer on the dominant measure of economic inequality, and on some alternatives/supplements to it: “Gini coefficient: An introduction.”
* Plutarch
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As we aim to understand, we might note that today is the Summer Solstice, the day on which the earth’s north pole is maximally tilted toward sun, and there are more hours of daylight than on any other day of the year (in the Northern Hemisphere; in the Southern, it is the Winter Solstice, the shortest day). The June solstice is the only day of the year when all locations inside the Arctic Circle experience a continuous period of daylight for 24 hours. And perhaps more immediately, it is the “official” start of Summer.
(The 21st is the traditional date; in the event, the solstice falls on the 20th, 21st, or 22nd– this year, on the 20th… still, the traditional date is the one folks tend to mark.)
Not coincidentally, today is also National Daylight Appreciation Day.
“The grid is awesomely complex. It is the largest machine in the world.”*…
Solar Flare (upper left), May 28, 2020
The Sun emitted its largest solar flare since 2017 on Friday, indicating that our star may be awakening from a quiet period that has lasted several years. Though the flare erupted on the opposite side of the Sun from Earth, NASA’s Solar Dynamics Observatory was able to detect its glow above the solar surface, which is visible in the upper left corner of the above image…
Solar flares, sudden bursts of light blasted out by the Sun, are sometimes accompanied by arcing ejections of hot plasma from the star. These flashes normally show up in the same area as sunspots, which are dark patches of the solar surface that are slightly cooler than other parts of the Sun.
Our star experiences solar cycles that last about 11 years and are timed by the number of sunspots visible on the surface: peak activity correlates to the largest numbers of sunspots in a cycle, while a relatively spotless Sun is considered to be in hibernation. The last cycle started in 2008, and produced a major solar storm in 2012.
These storms also cause extremely bright and vivid auroras, popularly called the Northern and Southern Lights, as the glut of charged particles from a more energetic Sun illuminates the skies. However, past incidents show that extremely powerful flares and ejections—which blast out powerful surges of X-ray and UV radiation—can also scramble satellite systems and even cause energy failures on Earth, such as a blackout in March 1989 that left millions of people in Québec without power… (source and more info)
Indeed, after the 1989 event, earth had a near miss when the effects of a much more powerful storm barely passed us by…
Back in 2012, the Sun erupted with a powerful solar storm that just missed the Earth but was big enough to “knock modern civilization back to the 18th century,” NASA said.
The extreme space weather that tore through Earth’s orbit on July 23, 2012, was the most powerful in 150 years, [see here for info on that earlier storm] according to a statement posted on the US space agency website Wednesday.
However, few Earthlings had any idea what was going on.
“If the eruption had occurred only one week earlier, Earth would have been in the line of fire,” said Daniel Baker, professor of atmospheric and space physics at the University of Colorado…. (source and more info)
The damage, should another huge solar storm hit, could be massive– but wouldn’t be evenly distributed…
This map shows 100-year storm-induced voltages on the national electric power grid
A new study about solar-induced power outages in the U.S. electric grid finds that a few key regions—a portion of the Midwest and Eastern Seaboard—appear to be more vulnerable than others…
Solar flares and other solar-mass ejections that travel through space can slam into Earth’s atmosphere and generate powerful electric and magnetic fields. These magnetic storms can occasionally be intense enough to interfere with the operation of high-voltage electricity lines.
Depending on the geology of a given region, the currents a geomagnetic storm induces in the power lines can destabilize the power grid’s operation and cause damage to (or even destroy) transformers….
Utilities in those [most vulnerable] regions need to know that power disturbances and outages—and possibly blown transformers—are more likely in the case of a big solar storm hitting Earth.
In a worst-case scenario… portions of the electric grid without enough backup transformers and other equipment could find themselves unable to operate until they can swap in backup systems. Of course, if there are not enough transformers and other devices, many in the hardest-hit regions could be without power for days or weeks until equipment could be delivered or built from scratch…
The worst-case scenario, the one that keeps grid experts up at night, happened last in 1859. It originated in a solar flare that blasted off the solar surface on 1 September 1859 and was observed by the English amateur astronomers Richard Carrington and Richard Hodgson.
Fortunately, when the “Carrington Event” hit Earth, the world had precious little electric infrastructure to disturb. It was mostly telegraph wires along railway lines that felt any high-voltage surges.
“There’s some expectation that if we were to have a repeat of the 1859 storm, it could have some substantial effects on the electric power grid and other technology that modern society depends upon,” [USGS research geophysicist Jeffrey] Love said. And because so many of today’s electrical systems are built around computer chips that are not robust to high-voltage surges, the fear is that a modern-day Carrington event could also blow out some portion of our computerized world… (source and more info)
What can we do about it? We can urge utilities (and their regulators) to expand and extend the emergency transformer stockpile (Grid Assurance) and to shore up the grid’s resilience to electromagnetic pulses.
As though we need one more thing about which to be concerned…
* The Grid: The Fraying Wires Between Americans and Our Energy Future
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As we have a sunny day, we might spare a thought for Joseph Ritter von Fraunhofer; he died on this date in 1826. A physicist and optical lens manufacturer, he made optical glass and achromatic telescope objective lenses, invented the spectroscope, and developed diffraction grating. But he is perhaps best remembered for his discovery of the dark absorption lines in the spectrum of the sun (created by selective absorption of those wavelengths by the atoms of different elements)– now, appropriately, known as Fraunhofer lines.
“Doubt thou the stars are fire”*…
Solar storms are a relatively regular occurrence. But in 1859, a massive solar storm occurred; solar flares created the one of the largest geomagnetic storms on record. Telegraph service failed… but otherwise the event was largely a curiosity.
A new study calculates that our sun may produce another ‘superflare’ in the next 100 years… and suggests that the resulting damage to electronic systems on which we’ve come to depend could be devastating.
How much more disruptive would a superflare be? It’s hard to say because the damage would seem to be incalculable. A superflare even a hundred times more powerful than what we normally experience would almost certainly hit every unprotected electronic system on Earth in some fashion, disrupting or outright crippling powergrids around the world, disabling machinery and manufacturing, blowing out cell phones, satellites, and all the rest. Transportation systems depend on electronics, as do utility systems, communications systems, in short: everything could just stop working overnight, even though we probably wouldn’t feel a thing.
If the superflare was thousands of times more powerful than normal? For all we know, it could send humanity back to the Age of Sail practically overnight–at least until we can repair or replace the entire planet’s electronic infrastructure, a tall order when you have no power transmission to manufacture replacement electronic components and we’re all reduced to communicating using carrier pigeons and old fashioned letters…
The solar storm of 2012 was of similar magnitude to the 1859 flare, but it passed Earth’s orbit without striking the planet, missing by nine days. For more on what we might expect of we’re not so lucky next time, see “Massive Superflare Eruption from Sun within 100 Years Possible, New Study Says.”
And for more background see: “Solar Flare: What If Biggest Known Sun Storm Hit Today?”
* Shakespeare
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As we slip on our shades, we might spare a thought for Giovanni Battista Riccioli; he died on this date in 1671. He is known, among other things, for his experiments with pendulums and with falling bodies, for his discussion of 126 arguments concerning the motion of the Earth, and for discovering the first double star. But he is perhaps most remembered for introducing (in in Almagestum Novum in1651) the current scheme of lunar nomenclature: he named the more prominent features after famous astronomers, scientists and philosophers, while the large dark and smooth areas he called “seas” or “maria”. The lunar seas were named after moods (Seas of Tranquillity, Serenity) or terrestrial phenomena (Sea of Rains, Ocean or Storms).
“Wherever there is light, one can photograph”*…
Three decades ago, as a graduate student at the San Francisco Art Institute, Mimi Plumb [see here] was wandering around Bernal Heights when she came across the site of a recent house fire. Plumb went inside to explore the building’s charred remains. She paused to photograph a blackened globe and a singed stack of telephone books. In the basement, she found snapshots of an unknown family, and in the bedroom, a burned lamp and dresser. The grim, soot-filled rooms would later remind her of her childhood during the Cuban missile crisis, when duck-and-cover drills occurred every few weeks. “My mother told me there might be a nuclear war,” Plumb says. “I would wake up in the middle of the night.”
The photos of the house were among the first that Plumb would take for her series Dark Days, which will be published this summer by TBW Books in a collection titled Landfall…
After seven years of taking photos for the series, Plumb did the unthinkable: She packed the negatives into a box and didn’t look at them again. In some ways, she knew she had nothing more to add to the work, that she had adequately captured that feeling of imbalance. But there was also another reason. Plumb felt pressure as a female photographer to take more “palatable” images.
The series was tucked away until 2015, when Plumb, having retired from teaching black-and-white photography, began going through her archives. She was struck by how much the work — with its themes of nuclear anxiety and environmental decline — “runs eerily parallel to our current situation.”…
More on Plumb’s work at “Unearthed“; see more of the Dark Days series at her site
* Alfred Stieglitz
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As we ponder the pix, we might recall that it was on this date in 1845 that French physicists Louis Fizeau and Leon Foucault took the first photograph of the sun. The daguerreotype was just 4.7 inches, but as National Geographic reported, still caught sunspots.
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