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Welcome to the Objective Europa forum for general debate and discussions in areas related to a crewed mission to Jovian moon Europa. Suggestions and ideas in the forum will not be filed as part of the research in phase-I.

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Pages: 1
Author Topic: Surface light


vonB
Administrator
Posts: 26
Surface light
on: September 23, 2013, 11:26

The sunlight reaching Europa is app 1/25 of what we get here on Earth.

So, what does that mean in terms of regular operations (if possible) using human eyes. I guess its not just 1/25 we experience, since pupils will be dilated. So light - as we see it as humans compared to a normal sunny day here must be more than 1/25, or ?



Pascal
Administrator
Posts: 12
Re: Surface light
on: September 24, 2013, 20:35

There are several ways that this can be addressed. The human eye is adaptable enough that such low light vision is possible. During daytime, the light will be similar to what we experience at sunrise/sunset. During night time, of course, the light will be significantly less, until you consider the reflection of light from the other moons, as well as Jupiter itself. I would imagine that artificial sunlight would be used inside base for mood control, but outside of base red light should be used to preserve night vision. By standardizing red light, crew members would be better adjusted to the atmosphere of Europa.



ChrisWeeks-
3D
Europa Dreamer
Posts: 10
Re: Surface light
on: September 25, 2013, 03:52

So I did some quick research on the subject and was a bit surprised. Apparently the light of the full moon from Earth is 1/400,000 that of full sunlight. So if we use that as a comparison, 1/25th seems like it is much closer to the realm of full sunlight than it would seem. Furthermore, the brightness of the sun as seen from Earth right before sunset is about 1/64 of what it is at noon. So, with that as a comparison, it seems like 1/25 light we see from Europa would be comparable to late afternoon, or maybe a slightly cloudy day here. This certainly gives a greater appreciation of the adaptability of the eye to different lighting conditions, and suggests that the human eye probably wouldn't detect much of a difference even from the outer solar system.

As I mentioned, I got these figures from just some cursory research, so I welcome any corrections, but if accurate, I do find this some eye opening (haha!) info.



Pascal
Administrator
Posts: 12
Re: Surface light
on: September 26, 2013, 17:26

Chris is correct - The light seems to be adequate on Europa - at night, however, and lacking reflection from Jupiter, Europa may become very dark.



Juliette
Europa Dreamer
Posts: 1
Re: Surface light
on: October 8, 2013, 00:39

Another possibility for extreme low light would be to use night vision goggles. This would only be necessary for "night shift" and probably only once in a while. I agree that the human eye can adapt to many kinds of levels of light, however prolonged stress on the eyes could be detrimental.

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