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sol cyan balance
sol yellow balance
sol niger within medley @ the melloboat in sweden. fredrik thordendahl, morgan agren, mattias eklundh, gustaf hielm.
the sun is now in the quietest phase of its 11-year activity cycle, the solar minimum - in fact, it has been unusually quiet this year - with over 200 days so far with no observed sunspots. the solar wind has also dropped to its lowest levels in 50 years. scientists are unsure of the significance of this unusual calm, but are continually monitoring our closest star with an array of telescopes and satellites. seen below are some recent images of the sun in more active times.
a sweeping prominence, a huge cloud of relatively cool dense plasma is seen suspended in the sun's hot, thin corona. at times, promineces can erupt, escaping the sun's atmosphere. emission in this spectral line shows the upper chromosphere at a temperature of about 60,000 degrees k (over 100,000 degrees f). every feature in the image traces magnetic field structure. the hottest areas appear almost white, while the darker red areas indicate cooler temperatures. (courtesy of soho/eit consortium)
a view of a sunspot and granules on the sun`s surface, seen in the h-alpha wavelength on august 4, 2003. (swedish 1-m solar telescope (sst) operated by the royal swedish academy of sciences, göran scharmer and kai langhans, isp)
the total solar eclipse of february 16, 1980 was photographed from palem, india, by a research team from the high altitude observatory of the national center for atmospheric research. the photograph of the solar corona was taken with a camera system developed by gordon a. newkirk, jr. this specialized instrument photographs the corona in red light, 6400 a -- through a radially graded filter that suppresses the bright inner corona in order to show the much fainter streamers of the outer corona in the same photograph. (rhodes college, memphis, tennessee / high altitude observatory (hao), university corporation for atmospheric research (ucar)
the planet venus is seen by nasa`s trace satellite, at the start of its transit across the sun on june 8, 2004. (nasa/trace)
solar flares produce seismic waves in the sun`s interior that closely resemble those created by earthquakes on our planet. on may 27, 1998, researchers observed this flare-generated solar quake that contained about 40,000 times the energy released in the great earthquake that devastated san francisco in 1906, equivalent to an 11.3 magnitude earthquake, scientists calculated. over the course of an hour, the solar waves traveled for a distance equal to 10 earth diameters before fading into the fiery background of the sun`s photosphere. unlike water ripples that travel outward at a constant velocity, the solar waves accelerated from an initial speed of 22,000 miles per hour to a maximum of 250,000 miles per hour before disappearing. (courtesy of soho/eit consortium. soho is a project of international cooperation between esa and nasa)
an animation of the sun, seen by nasa`s extreme ultraviolet imaging telescope (eit) over the course of 6 days, starting june 27, 2005. (courtesy of soho/eit consortium)
hinode successfully captured a massive solar flare on 13 december 2006. it was one of the largest flares occurring in that period of solar activity minimum. (jaxa/nasa/pparc)
the image shows the corona for a moderately active sun, with some (red) hot active regions in both hemispheres, surrounded by the (blue/green) cooler plasma of the quiet-sun corona. notice also the north polar-crown filament, the trans-equatorial loops, and the coronal hole in the south-east (lower-right) corner of the image and the smaller one over the north pole. this image shows the solar corona in a false-color, 3-layer composite: the blue, green, and red channels show the 171å, 195å, and 284å wavelengths, respectively (most sensitive to emission from 1, 1.5, and 2 million degree gases). (trace project, stanford-lockheed institute for space research, nasa)
a view of an irregular-shaped sunspot and granules on the sun's surface, seen on august 22, 2003. (swedish 1-m solar telescope (sst) operated by the royal swedish academy of sciences, oddbjorn engvold, jun elin wiik, luc rouppe van der voort, oslo)
on november 8, 2006, mercury is seen, beginning a transit in front of the sun. (nasa/trace)
sol needs some glasses.
