Temperature and flows inside the sun alter the frequencies of solar oscillations, and since the mid-1980s helioseismology, which makes use of oscillations to study the sun's structure, has developed rapidly.
由於太陽溫度、內部運動會影響震波週期，八零年代中期之後，利用震波探索太陽結構的日震學就此蓬勃發展。