Star Trails & Airglow, Warner Valley

30-minute exposure + 120 mins. spent researching the green glow. Per Don Hampton, UAF's Geophysical Institute: Airglow: a chemical process where a reaction between oxygen molecules & atoms produce an oxygen atom in an excited state that releases light.

Exposure Date: 2014:07:21 00:16:37;

Make: NIKON CORPORATION;

Model: NIKON D200;

ExposureTime: 8992/5 s;

FNumber: f/2;

ISOSpeedRatings: 100;

ExposureProgram: Manual;

ExposureBiasValue: 4294967295/1;

MeteringMode: CenterWeightedAverage;

Flash: Flash did not fire;

FocalLength: 16 mm;

Software: iPhoto version 9.5.1 (902.17)

Night sky / astronomical twilight / astrophotography: "Star Trails, Airglow Warner Valley" Airglow or nightglow is an optical phenomenon in planetary atmosphere. There was also regional sheet lightening out Susanville way. View orientation N-NE from June's patio, pine tree silhouettes, Lassen National Forest, southern Cascade Mountain Range, Warner Valley Road, Chester, California -- 16mm DX lens, 30 minute clock exposure @ f/2.8, ISO 100, long NR "ON," ISO NR "off"