HR: 0830h
AN: SP11B-13    [Abstracts]
TI: Characteristic Patterns of the Mode Frequencies With Solar Activity Indices
AU: * Tripathy, S C
EM: sushant@nso.edu
AF: National Solar Observatory, 950 N Cherry Avenue, Tucson, AZ 85719 United States
AU: Jain, K
EM: kjain_2004@yahoo.com
AF: National Solar Observatory, 950 N Cherry Avenue, Tucson, AZ 85719 United States
AU: Bachmann, K T
EM: kbachman@ossm.edu
AF: Oklahoma School of Science and Mathematics, 1141 North Lincoln Boulevard,, Oklahoma City, OK 73104 United States
AB: The variability of solar p-mode oscillation frequencies during the course of a solar cycle is the result of perturbations due to changing average magnetic flux near the solar surface and is an important clue toward understanding the mechanisms of solar activity. We analyze temporal relationships among p-mode frequencies measured by GONG and MDI having ℓ ≤ 200 and 1.5 mHz ≤ ν ≤ 3.5 mHz to establish the presence of characteristic loop patterns with the 10.7-cm flux (F₁₀), the Kitt Peak Magnetic Index (KPMI), International Sunspot Number (R_Z), and the radiative indices: He I equivalent width and Mg II core-to-wing ratio. The data cover the ascending and descending phases of the current solar activity cycle 23. Our preliminary results indicate that p-mode frequencies vary closely with F_10z and KPMI but lead the radiative indices and lag R_Z by approximately one month. This implies that the more generalized magnetic flux responsible for F₁₀ and KPMI, which is known to follow the emergence of the powerful localized flux of sunspots, is more closely linked to the variation of intermediate-degree p-mode frequencies.
DE: 7500 SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY
DE: 7522 Helioseismology
DE: 7536 Solar activity cycle (2162)
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly