The stunning imagery that can be accessed through The Sun Live is an obvious candidate for sharing. Thankfully, the app let you save any of the images locally, or share them through the platforms standard sharing framework (email, messaging, social media, and more).
The app also includes optional lockscreen integration (show latest images when you lock/unlock device) and, when pinned to the Start screen, the apps Live Tile will also show the latest solar image.
Windows Phone Store description:
Watch the amazing activity on the surface of the Sun on your Windows Phone while it really happens. The Sun Live gives you the always updated images from the Solar Dynamics Observatory orbiting the Earth and monitoring the Sun 24/7. Hunt for prominences, flares and sun spots and save the most spectacular images on your phone or send them through mail, mms or social media.
The Sun Live, which is only available for Windows Phone 8, is a free download from the Windows Phone Store.