There are faint lines emanating from Scotland and northern England, with a negative gradient, about 30° to the horizontal. What are these, airplanes? Or artefacts? Why are they so consistent?
This is the beginnings of an answer. @called2voyage has commented that it looks similar to other striping artifacts from the same satellite. A quick look through there (I'm still trying to read through more carefully) seems to show the striping as horizontal (East-West).
Looking at the image with a bunch of tweaks in color effects shows lines that seem to be tilted at -12 degrees, with a period of about 12 kilometers.
Have to do more reading/searching now to see if there is a 12 degree tilted instrument on board the satellite, or if the satellite's attitude could have been tilted. Suomi NPP does keep busy doing attitude adjustments, although these are carefully coordinated with image acquisitions and are not likely to produce "out-of-whack" images without sufficient documentation. I wish the OP had provided specific information about the date/time of this image or a link to it's source within the database!
If you've ever seen any of the NATS videos on YouTube or Vimeo (downloadable) you can appreciate the OP's comment about air traffic and parallel lines. cf UK 24 or see below. Of course the satellite is in a sun-synchronous LEO and would not be generating long or time-lapse exposures that could produce streaks from aircraft, but the similarity of the appearence is worth noting.
In the mean time if someone more familliar with the satellite can add insight, please feel free to add to this answer or cannibalize it.
Below: From the NPP Fact Sheet - Final.pdf.
Watch: (watch for the military and the civilian "practice exercises")