Sodium Emission vs. Rayleigh Scattering

We’re not far from the ninth anniversary of the founding of Decaseconds, and I came upon this arresting image of Berkeley Marina, the Marin Headlands, and the Golden Gate Bridge (never before published here) while searching for just the right anniversary shot. I’m fascinated by the way the orange emission of sodium vapor lamps lighting Berkeley (I’m sure now all swapped for white LEDs) matches the Rayleigh-scattered oranges of the winter sunset. The same wavelengths of light, coming from completely different mechanisms.

Sodium Emission vs. Rayleigh Scattering

Fire Trails Apart

As busy as the cities of the Bay Area become, there are the spaces in the fire trails (like the one in the foreground) to get some quiet and distance. There’s an odd orthogonality of the senses in being able to see all of the commotion below with none of the accompanying sound.

Fire Trails Apart

Independence Weekend Picnic with a View

Watching the summer sunset behind Oakland, San Francisco, Berkeley, and Marin is the perfect setting for a dinner picnic. This weekend is Memorial Day: the unofficial start of summer in much of the United States and the perfect time (i.e. time off) for picnics and barbecuing. Though this picture came from another big barbecuing holiday (Independence Day), the scene is likely to be replicated this weekend.

Independence Weekend Picnic with a View

(A) Walk in the Woods

Historical patterns of land conservation in the Bay Area mean that the gradient between densely populated and relatively “empty” spaces is particularly steep. That nearby density means that maintaining “wild” spaces requires a theme-park like approach of fenced, paved trails. Given the erosion challenges faced by the peaks of the Adirondacks, perhaps this isn’t the worst solution.

(A) Walk in the Woods