TY - JOUR T1 - Variation of solar oscillation frequencies in solar cycle 23 and their relation to sunspot area and number JO - Astronomy and Astrophysics PY - 2012/01/01 AU - Jain R AU - Tripathy SC AU - Watson FT AU - Fletcher L AU - Jain K AU - Hill F ED - DO - DOI: 10.1051/0004-6361/201219876 VL - 545 Y2 - 2024/12/22 ER -