The Sound of Silence: Cosmic Rays Downpour (Edoardo Luca Radice (Astroedo))

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The Sound of Silence: Cosmic Rays Downpour

When the sky is cloudy or the Moon is full, it's time to update the dark frame library.

Dark frames takes no light, but this doesn't mean that they don't get any signal.

Cosmic rays are charged particles that comes from deep space, a few of them, probably from outside our galaxy.

When they hit our upper atmosphere they convert their huge kinetic energy into a shower of secondary particles.

Large part of this secondary particles are high energy muons coming from the decay of PI Mesons.

When these particles hit the CCD pixels, loose energy popping electrons from their position and produce a real signal on the sensor in the form of straight streaks.

But there are also other traces: waving short path of light called "worms" and pointlike features called "spots".

Worms are most probably multi-scattered low-energy electrons produced by natural radioactivity inside the telescope or by Compton scattering from gamma rays (also produced by natural radioactivity; near the center is present a very long, perfectly straight, trace from a secondary cosmic ray.

This is what I call "the sound of silence": every single dot, streak and worm in this image is a charged particle that hit my camera and released part of its energy during the total 2.5 hours exposure.

The image is the integration of 30x300 s dark frames, each one carefully calibrated to remove hot pixels (sensor defects).

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Description: Detail on a single streak

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The Sound of Silence: Cosmic Rays Downpour

The Sound of Silence: Cosmic Rays Downpour

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The Sound of Silence: Cosmic Rays Downpour

The Sound of Silence: Cosmic Rays Downpour

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