The Green Flash by Jim Kelley.

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Presentation transcript:

The Green Flash by Jim Kelley

Sunrise Green Flash in Baja California by Mike Greenfelder 1/18/2019 jim kelley

According to Nathaniel Bowditch, in the American Practical Navigator (1802), the Following Conditions are Favorable to the Observation of the Green Flash: 1. A Sharp Horizon 2. A Clear Atmosphere 3. A Temperature Inversion 4. An Attentive Observer 1/18/2019 jim kelley

The Visible Spectrum 400nm 500nm 600nm 700nm 1 nm (nanometer) = 10-9 meters 1/18/2019 jim kelley

The Atmosphere Refracts (Bends) Light from the Sun. Long Wavelength Light (Red) is Bent the Least, because it “Sees” less Atmosphere for a given Distance Traveled Short Wavelength Light (Violet) is Bent the Most, because in “Sees” more Atmosphere for a given Distance Traveled 1/18/2019 jim kelley

D 1/18/2019 jim kelley

EARTH SUN 1/18/2019 jim kelley

Attentive Observer Sunset is Produced By the Earth Rotating The Observer Away From The Sun Distant Sun 1/18/2019 jim kelley

As The Sun Sets, First We See Just the Red… …but 0.7 seconds later 1/18/2019 jim kelley

Less than a Second Later… And After the Green… Less than a Second Later… t1 t2 1/18/2019 jim kelley

Attentive Observer Sunset is Produced By the Earth Rotating The Observer Away From The Sun Distant Sun 1/18/2019 jim kelley

Sunrise is Produced By the Earth Rotating The Observer Toward The Sun So the Colors Appear in Reverse Order Distant Sun 1/18/2019 jim kelley

The Green and Violet Flash are Best Seen With Binoculars Do Not Look Directly at the Sun Until it is More Than Halfway Set The Green Flash Can Be Seen at Sunrise— The Colors Appear in Reverse Order It Can Also Be Seen With the Rising and Setting Moon 1/18/2019 jim kelley

1/18/2019 jim kelley

1/18/2019 jim kelley

1/18/2019 jim kelley

1/18/2019 jim kelley

Sunrise Green Flash in Baja California by Mike Greenfelder 1/18/2019 jim kelley

Sunrise Green Flash in Baja California by Mike Greenfelder 1/18/2019 jim kelley

Green Flash in the Drake Passage by Tim Soper 1/18/2019 jim kelley

So Look for the Green Flash! 1/18/2019 jim kelley