Essentials
theDiagonal is a personal blog by Mike Gerra, skeptic, technologist, psychologist, artist, humanist, collector of grand, eclectic ideas.theDiagonal blog connects the dots across multiple disciplines for inquisitive, objective and critical thinkers, exploring the vertices of big science, disruptive innovation, global sustainability, illuminating literature and leftfield art. It is on this diagonal that creativity thrives, big ideas take flight and reason triumphs.
Tag Archives: solar
Saturday, July 21, 2012
Solar Tornadoes
No, Solar tornadoes are not another manifestation of our slowly warming planet. Rather, these phenomena are believed to explain why the outer reaches of the solar atmosphere are so much hotter than its surface.
From ars technica:
One of the abiding mysteries surrounding our Sun is understanding how the corona gets so hot. The Sun’s surface, which emits almost all the visible light, is about 5800 Kelvins. The surrounding corona rises to over a million K, but the heating process has not been identified. Most solar physicists suspect the process is magnetic, since the strong magnetic fields at the Sun’s surface drive much of the solar weather (including sunspots, coronal loops, prominences, and mass ejections). However, the diffuse solar atmosphere is magnetically too quiet on the large scales. The recent discovery of atmospheric “tornadoes”—swirls of gas over a thousand kilometers in diameter above the Sun’s surface—may provide a possible answer.
...read moreThursday, July 28, 2011
Rechargeable Nanotube-Based Solar Energy Storage
From Ars Technica:
Since the 1970s, chemists have worked on storing solar energy in molecules that change state in response to light. These photoactive molecules could be the ideal solar fuel, as the right material should be transportable, affordable, and rechargeable. Unfortunately, scientists haven’t had much success.
One of the best examples in recent years, tetracarbonly-diruthenium fulvalene, requires the use of ruthenium, which is rare and expensive. Furthermore, the ruthenium compound has a volumetric energy density (watt-hours per liter) that is several times smaller than that of a standard lithium-ion battery.
Alexie Kolpak and Jeffrey Grossman from the Massachusetts Institute of Technology propose a new type of solar thermal fuel that would be affordable, rechargeable, thermally stable, and more energy-dense than lithium-ion batteries. Their proposed design combines an organic photoactive molecule, azobenzene, with the ever-popular carbon nanotube.
Wednesday, June 29, 2011
Solar power from space: Beam it down, Scotty
From the Economist:
THE idea of collecting solar energy in space and beaming it to Earth has been around for at least 70 years. In “Reason”, a short story by Isaac Asimov that was published in 1941, a space station transmits energy collected from the sun to various planets using microwave beams.
The advantage of intercepting sunlight in space, instead of letting it find its own way through the atmosphere, is that so much gets absorbed by the air. By converting it to the right frequency first (one of the so-called windows in the atmosphere, in which little energy is absorbed) a space-based collector could, enthusiasts claim, yield on average five times as much power as one located on the ground.
...read moreFriday, January 25, 2008
A Solar Grand Plan
From Scientific American:
By 2050 solar power could end U.S. dependence on foreign oil and slash greenhouse gas emissions.
High prices for gasoline and home heating oil are here to stay. The U.S. is at war in the Middle East at least in part to protect its foreign oil interests. And as China, India and other nations rapidly increase their demand for fossil fuels, future fighting over energy looms large. In the meantime, power plants that burn coal, oil and natural gas, as well as vehicles everywhere, continue to pour millions of tons of pollutants and greenhouse gases into the atmosphere annually, threatening the planet.
Well-meaning scientists, engineers, economists and politicians have proposed various steps that could slightly reduce fossil-fuel use and emissions. These steps are not enough. The U.S. needs a bold plan to free itself from fossil fuels. Our analysis convinces us that a massive switch to solar power is the logical answer.
...read more