dark spherical shape glowing brilliant lime-green, leaving a glowing green trailI was driving south on Hwy 101 toward Ventura California, less than 45 miles to the city limits. I was with my boyfriend, but he was asleep in the passenger seat. I saw a brilliant lime-green light that streaked in an absolute vertical path (I am an artist, and very good at drawing, so I am very clear about vertical and horizontal alignment - this was a straight vertical) which was visible from the upper part of the windshield down more than halfway to the horizon. My line of sight was clear in front of me, mountainous to my left side, and ocean on my right. The road runs right on the coast in this area. I first assumed that it was a comet or shooting star, but I have never seen one like that before, and another quality was that the actual object was glowing that brilliant lime-green color, which I have never heard of in a comet. It left a long green glowing tail the full length that I could see it and contiued to glow for another second or two. The most unusual aspect was that it seemed as though it was a spherical object that was itself dark in color, but was 'glowing' all the way around it, because the object seemed to look like the color 'thinned' toward the center, and was extremely vivid at the edges, like it was producing the light as an aura or emission, it appeared like a green corona. I definitely saw darkening in the center and made mental note of it. I can't estimate the size but it seemed much larger than any shooting star I have seen. I have observed meteor showers, and never seen anything that is similar.