defojustfreinds - Tumblr blog

[defojustfreinds]

[defojustfreinds]

💫

[defojustfreinds]

<3

tortle nock

[defojustfreinds]

Sunspots are dark regions on the solar surface that contain complex arrangements of strong  localized magnetic fields and are often accompanied by intense solar activity (such as solar flares, coronal mass ejections), especially during the solar maximum. The dark central region of  a sunspot is called the umbra. It contains nearly vertically oriented magnetic flux tubes, which suppress the convective heat transfer. These magnetic flux tubes emerge to the solar surface at the activity belt (±30◦ latitude) and form bipolar sunspot pairs. Due to the energy deficit the inner part of the sunspot is about 1,500 degrees cooler than the surrounding quiet Sun, therefore it appears darker against the hotter and brighter background. The semi-dark outer section of the sunspot – the penumbra is surprisingly complex. It contains bright and dark filamentary structures with varying magnetic field inclinations. The inclination of the magnetic field plays a significant role in the formation of radial plasma currents, known as the Evershed flow. In the presence of increasing magnetic inclination the granular cells become elongated magnetoconvective rolls. 

More information:

Spectropolarimetry of Sunspot Penumbrae

A mean-field Babcock-Leighton solar dynamo model with long-term variability

Convection and the Origin of Evershed Flows

Sunspot Modeling: From Simplified Models to Radiative MHD Simulations

Image Credit: The Royal Swedish Academy of Sciences, Vasco M.J. Henriques/Luc Rouppe van der Voort

[defojustfreinds]

Happy Ada Lovelace Day! Celebrate with her beautiful letter on science and spirituality, then revisit the story of how she became the world’s first computer programmer, paving the way for women in science and tech. 

[defojustfreinds]

Hubble’s Finest - Planetary Nebulae

[defojustfreinds]

[defojustfreinds]

👀

[defojustfreinds]

Yeah so there was a pumpkin on fire in my science class today

[defojustfreinds]

One of my flatmates drew pictures of all of our faces and i look like Gareth Gates...

[defojustfreinds]

APOD: 10 years of the Perseid meteor shower.

[defojustfreinds]

[defojustfreinds]

[defojustfreinds]

This is the coolest outer space animation ever. It shows the Crab Supernova explosion, happened in 1054, and its evolution into the remnant it is now - called the Crab Nebula. Basically a thousand years speeded up into less than a minute.

Modern understanding that the Crab Nebula was created by a supernova, an explosion of a massive supergiant star, dates to 1921 when Carl Otto Lampland announced he had seen changes in its structure. This eventually led to the conclusion that the creation of the Crab Nebula corresponds to the bright SN 1054 supernova recorded by Chinese astronomers in AD 1054. There is also a 13th-century Japanese reference to an appearance of a new or “guest” star in Meigetsuki. It was then so bright it was visible during the daytime for 23 days.

animation credit: ESA/Hubble (M. Kornmesser & L. L. Christensen)

[defojustfreinds]

The luminous purple sky is mirrored in the thin sheet of water across the world’s largest salt flat, Salar de Uyuni, in Bolivia.

Photograph by Xiaohua Zhao

(TheGuardian)

[defojustfreinds]

Several years later, my obscure pickle jar shit post returns

[defojustfreinds]

she made me do it im sorry

me: takes post shower selfies instead of revising