Latest Posts by read-a-me-to-me - Page 2

Vyacheslav Kulikov    

Coronal Prominence Cavity

  Prominences are regions of cool, condensed plasma supported by twisted magnetic field lines that globally wrap around an axial magnetic field, called a  magnetic flux rope. Most of the flux rope volume is filled with depleted coronal plasma and forms a transitory cavity – a dark elliptical or semi-circular region that appears empty from our viewpoint. White-light coronagraph observations suggest that cavity density is approximately half the density of the surrounding streamers. However, the plasma properties within the cavities are not uniform, they exhibit temperature substructures that have been observed in multiple wavelengths.

Tuned to observe emission in the extreme ultraviolet (EUV or XUV), NASA’s Atmospheric Imaging Assembly (AIA) instrument on board the Solar Dynamics Observatory (SDO) provides high-definition imagery of the Sun in seven wavelength passbands. Each of the wavelengths highlight a specific aspect of the solar surface and atmosphere, for example; the dark elliptical structure of the coronal cavity, and outer bright streamers are most visible in AIA 211 Å (Fe XIV), and AIA 193 Å (Fe XII, XXIV) channels, as shown below:

The AIA 171 Å (Fe IX) channel also shows the fine structure of loops, plus the central prominence:

In the 304 Å (He II) channel only the chromospheric features are visible:

More information:

Thermal Properties of a Coronal Cavity (PDF)

SDO/AIA Detection of Solar Prominence Formation Within a Coronal Cavity 

Modeling Coronal Cavities

Image Credit: NASA/SDO/LMSAL

Apollo 16 spacecraft touches down in the central Pacific Ocean … #Astronomy #Space #Spacegram #Spaceflight #Nasa #ESA #ASI #Astronaut #Universe #Cosmos #Sky #Earth #Nebula #Galaxy #Love #MarsGeneration #TheMarsGeneration #MoonColonist #Moon #Astro_Lorenzo

Pierrette Bloch (French, born 1928)

Untitled, 1977

Ink on paper on isorel

Midnight sun at Lake Luossajärvi. Kiruna, Lappland, Sweden. Original postcard, tinted. 1940-1959. Swedish National Heritage Board.

I am a rock Skällentorp, Eftra, Halland, Sweden 1930s

Source: Swedish National Heritage Board

Józef Chełmoński (Polish, 1849-1914)

Crane departure, 1871

Oil on canvas, 41.5 x 57.5 cm

Aragonite with Barite - Brixlegg - Schwaz, Inntal, Tyrol, Austria

Roj Friberg

“Industrilandskap”

1991-92

(mixed media, 109 x 123 cm)

Eartha Kitt

Istanbul, c. 1949

Yoshinori Mizutani, Tokyo Parrots, (2013).

Alberto Burri (Italian, 1915 – 1995)

Wood Combustion (Combustione legno), 1957

Wood veneer, paper, acrylic and vinavil on canvas, 149.5 x 99 cm

Anton Faistauer (Austrian, 1887-1930)

Lying female nude with apple still life (Liegender Frauenakt mit Apfelstillleben), 1911

Oil on canvas

Convection cells on the surface of the sun. (via @sci_phile)

Fluxus state. Coded in Processing. 40 frames. _Related: Noise, Pixel Flow.

A photo of Neptune. Took by Voyager with VGISS on August 28, 1989 at 17:31:55. Detail page on OPUS database.

“Portrait de femme de la Renaissance” by Lucien Victor Guirand de Scévola, 19th century

“Tongues of flame up to a mile high leap out from the surface of the Sun.” Children’s science book. 1947