Auroras (APOD 15 July 2007)
Posted: Mon Jul 16, 2007 4:51 pm
APOD was down for some time over this last weekend so using some links suggested by Asterick posters the Spanish mirror site has the missing Pod’s. This one for the 15th is interesting since the discussion recently has been about NLC’s (NoctiLucent clouds). The altitude of auroras is 50 km to as high as 500 km and NLC’s are at an altitude of 50 to 85 km. Aurora’s are supposed to be the result of charged particles whereas NLC’s are ice crystals or moisture covering a dust particle. Logically it would seem there would be a relationship between these two phenomena since they occupy overlapping altitudes. Aurora’s occur in northern and southern hemispheres where they are called Aurora borealis (Artic) and Aurora australis (Antarctic) wouldn’t NLC’s occur in both hemispheres also?
Aurora
APOD mirror site
July 15, 2007 APOD from mirror site
Don Pettit’s Aurora page
Don Pettit’s NLC from ISS page
Aurora FAO
Aurora
APOD mirror site
July 15, 2007 APOD from mirror site
Don Pettit’s Aurora page
Don Pettit’s NLC from ISS page
Aurora FAO