In our study of the Sun, special emphasis is placed on the features visible in the atmosphere of the Sun. We divide the Sun’s atmosphere into three layers. This diagram will be on your test. Here is a great page of images of the solar atmosphere. For daily images of the Sun check out this page. And these images are nearly real-time. The Sun is now a few years past solar minimum and is approaching what may be a significant solar maximum as 2024 begins. And here are a series of movies of the Sun. The first layer of the Sun we will study is the source of virtually all of the sunlight we receive. It is called the photosphere. The next layer of the atmosphere of the Sun is the chromosphere. Above the chromosphere the temperature rises rapidly through the transition zone, rising from about 100000 to 200000K. to almost one million K. It is here that we find the corona. Here is an excellent summary of all of the solar features that you will need to know.