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Astronomický snímek dne (APOD)

1. květen 2018

The Aurora and the Sunrise
The Aurora and the Sunrise
Image Credit: NASA, International Space Station, Ricky Arnold

Popis: On the International Space Station (ISS), you can only admire an aurora until the sun rises. Then the background Earth becomes too bright. Unfortunately, after sunset, the rapid orbit of the ISS around the Earth means that sunrise is usually less than 47 minutes away. In the featured image, a green aurora is visible below the ISS -- and on the horizon to the upper right, while sunrise approaches ominously from the upper left. Watching an aurora from space can be mesmerizing as its changing shape has been compared to a giant green amoeba. Auroras are composed of energetic electrons and protons from the Sun that impact the Earth's magnetic field and then spiral down toward the Earth so fast that they cause atmospheric atoms and molecules to glow. The ISS orbits at nearly the same height as auroras, many times flying right through an aurora's thin upper layers, an event that neither harms astronauts nor changes the shape of the aurora.

Share the Sky: NASA Open API for APOD

Klíčová slova: aurora, space station, sunrise

Originální text (anglicky)

Předcházející: Korona úplného zatmění Slunce v HDF Následující: Měsíční halo nad kamenným kruhem


Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA) ; česky Josef Chlachula
NASA Official: Phillip Newman Specific rights apply. NASA Web Privacy Policy and Important Notices A service of: ASD at NASA/GSFC
& Michigan Tech. U.