Are the corona and chromosphere hotter than the photosphere?

Yes, both the corona and the chromosphere are hotter than the photosphere. The photosphere, which is the visible surface of the Sun, has a temperature of about 5,500 degrees Celsius (9,932 degrees Fahrenheit). In contrast, the chromosphere can reach temperatures of around 20,000 degrees Celsius (36,032 degrees Fahrenheit), while the corona, the outermost layer, can soar to temperatures between 1 to 3 million degrees Celsius (1.8 to 5.4 million degrees Fahrenheit). This temperature increase in the outer layers is still a subject of research, particularly regarding the mechanisms behind it.