日にっ震しん学がくMeanings1nounhelioseismologyScientific field studying the internal structure and dynamics of the Sun through its oscillations.日にっ震しん学がくは太たい陽よう内ない部ぶの構こう造ぞうを調しらべる学がく問もんだ。Helioseismology is a discipline that investigates the internal structure of the Sun.