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  Image: Geographic Location Direction Photo #: ISS029-E-6020 Date: Sep. 2011
Geographic Region: PACIFIC OCEAN
Feature: PAN-SOUTHERN OCEAN, AURORA AUSTRALIS, AIRGLOW, SOLAR PANELS, ISS HARDWARE

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  Fire in the Sky

And the skies of night were alive with light, with a throbbing, thrilling flame; Amber and rose and violet, opal and gold it came. It swept the sky like a giant scythe, it quivered back to a wedge; Argently bright, it cleft the night with a wavy golden edge. — “The Ballad of the Northern Lights”

In describing auroras as he saw them in the far north in 1908, poet Robert Service captured the sense of fluid motion, the vivid color, and the fiery, flame-like qualities one sees from the ground. His description works just as well in the southern hemisphere and when looking down from above.

Astronauts on the International Space Station (ISS) used a digital camera to capture several hundred photographs of the aurora australis, or “southern lights,” while passing over the Indian Ocean on September 17, 2011. Solar panels and other sections of the ISS fill some of the upper right side of the photograph.

Auroras are a spectacular sign that our planet is electrically and magnetically connected to the Sun. These light shows are provoked by energy from the Sun and fueled by electrically charged particles trapped in Earth’s magnetic field, or magnetosphere. In this case, the space around Earth was stirred up by an explosion of hot, ionized gas from the Sun—a coronal mass ejection—that left the Sun on September 14, 2011.

The pressure and magnetic energy of the solar plasma stretches and twists the magnetic field of Earth like rubber bands, particularly in the tail on the night side. This energizes the particles trapped in our magnetic field; that energy is released suddenly as the field lines snap the particles down the field lines toward the north and south magnetic poles.

Fast-moving electrons collide with Earth’s upper atmosphere, transferring their energy to oxygen and nitrogen molecules and making them chemically “excited.” As the gases return to their normal state, they emit photons, small bursts of energy in the form of light. The color of light reflects the type of molecules releasing it; oxygen molecules and atoms tend to glow green, white or red, while nitrogen tends to be blue or purple. This ghostly light originates at altitudes of 100 to 400 kilometers (60 to 250 miles).
 
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Images: All Available Images Low-Resolution 145k
Mission: ISS029  
Roll - Frame: E - 6020
Geographical Name: PACIFIC OCEAN  
Features: PAN-SOUTHERN OCEAN, AURORA AUSTRALIS, AIRGLOW, SOLAR PANELS, ISS HARDWARE  
Center Lat x Lon: N x E
Film Exposure:   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 75
 
Camera: N5
 
Camera Tilt: HO   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 24  
 
Nadir to Photo Center Direction:   The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?:   Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number: 1535  
 
Date: 20110917   YYYYMMDD
Time: 173012   GMT HHMMSS
Nadir Lat: 50.7S  
Latitude of suborbital point of spacecraft
Nadir Lon: 82.3E  
Longitude of suborbital point of spacecraft
Sun Azimuth: 198   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 209   nautical miles
Sun Elevation: -40   Angle in degrees between the horizon and the sun, measured at the nadir point
Land Views:  
Water Views: OCEAN  
Atmosphere Views: AURORA  
Man Made Views:  
City Views:  
Photo is not associated with any sequences


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