Tuesday, September 29, 2015

Europe during last night's lunar eclipse

Yesterday morning the moon passed into the Earth's shadow. The period of totality happened to occur just as the Suomi NPP satellite was passing over Europe and northern Africa. Suomi carries the Visible Infrared Imaging Radiometer Suite (VIIRS), which includes a "Day Night Band" which is the best (and only) full-Earth nighttime imaging sensor. That makes for a very pretty picture:

Image and Data processing by NOAA's National Geophysical Data Center,
cropped and enhanced by me. This image can be used with credit to NOAA and me.

Blogger has limits on the image size, so you probably want to see this higher resolution version (the full resolution version is hundreds of Mb, if you want to download it you can for the next two weeks here).

When the moon is full, Suomi can see clouds and land extremely well, and oceans and lakes appear extremely dark. The brightest spots are artificial light from human settlements. For example, check out this zoom in of the Nile delta, Israel, and the Gulf of Suez from the same image:

Image and Data processing by NOAA's National Geophysical Data Center,
cropped and enhanced by me. This image can be used with credit to NOAA and me.

But during the eclipse, the moonlight is temporarily gone, and the areas of Europe and northern Africa were plunged into starlight, which is just a bit too dim for good imaging from the sensor. Luckily for us, much of Europe had clear skies, meaning that we can see the city lights shining through!

Nearly a year ago I posted an image of a lunar eclipse over North America that is maybe even cooler because of the different gradient in moonlight.

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