SAR-Arc - a photo on Flickriver

SAR-Arc

            SAR-Arc viewed from 4000ft at Thunder Ridge on the Blue Ridge Parkway in Virginia. 

A SAR arc is a phenomenon related to the Earth's magnetosphere and ionosphere. SAR stands for "Stable Auroral Red" arc. Here's a simple explanation:

Auroras: These are natural light displays in the sky, usually seen in high latitude regions (around the Arctic and Antarctic). They are caused by the interaction between the Earth's magnetosphere and solar wind—a stream of charged particles emanating from the Sun.

Geomagnetic Storms: These are disturbances in the Earth's magnetosphere caused by a solar wind shock wave or cloud of magnetic field that interacts with the Earth's magnetic field. This interaction can enhance auroral activity.

Stable Auroral Red (SAR) Arc: During geomagnetic storms, a SAR arc can form. It is a specific type of aurora that appears at lower latitudes than typical auroras. Unlike the more common green auroras, SAR arcs are characterized by their red color, which is due to their emission of light at specific red wavelengths. This red light comes primarily from atomic oxygen at higher altitudes in the Earth's atmosphere.

Stability and Location: The term "stable" in SAR arc refers to its relatively steady and long-lasting nature compared to other auroral phenomena, which can be quite dynamic and rapidly changing. SAR arcs are typically observed in the sub-auroral zone, which is the region between the usual auroral oval and lower latitude areas.

SC_7848-Enhanced-NR-Edit

Taken in: United States / Virginia / Curtis (show map)

Taken on: November 5, 2023

Tags:

aurora

parkway

Hammer

cs_hammer

blue ridge parkway

Bedford

SAR arc

Geomagnetic Storm

Stable Auroral Red Arc

Blue

Ridge

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Sets appears in: • Air and Space

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Camera: Nikon D750, f/2.8, 20 sec, 16mm, ISO 400 (more info) (hide info)

Camera:	Nikon D750
Lens:	Tokina opera 16-28mm F2.8 FF
Aperture:	f/2.8
Exposure Time:	20
Focal Length:	16mm
ISO:	400
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Manual
Exposure Mode:	Manual
Metering Mode:	Multi-segment
White Balance:	Auto
Gain Control:	Low gain up
Color Space:	Uncalibrated
Software:	Adobe Photoshop Lightroom Classic 13.0.1 (Windows)
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