Shooting directly into the sun is a tricky thing. Flare from reflections on the lens cover (filter glass), between the lens elements, etc, is the norm. Only the advances in anti-reflective coatings allow your image to look anywhere near as good as it does. You'll do better to get the sun behind a tree, behind a subject's head (with some fill flash, perhaps), or behind the clouds when shooting toward the sun. If you can actually see the sun in your image, or if it's just off-camera, with rays hitting the glass of your lens cover, you will probably have flare of some type. In the latter situation (just out of the frame), you might try shading the lens with a your hand (or, better) a proper, black lens shade with baffling and/or velvet layer. Depending on how much flare covers your image, you may be able to clean it up. And sometimes the flare can look really cool, too. So, don't fear the flare so much you never "break the rules", but do expect it when shooting into the sun. There is a reason shooting into the sun is normally not recommended. Also, be sure to keep cameras pointed toward the sun only for brief periods, as sensor damage can quickly occur.