Characteristic Patterns of the Mode Frequencies With Solar Activity Indices

Details Characteristic Patterns of the Mode Frequencies With Solar Activity Indices Characteristic Patterns of the Mode Frequencies With Solar Activity Indices

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp11b..13t&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP11B-13

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7522 Helioseismology, 7536 Solar Activity Cycle (2162)

Scientific paper

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 (RZ), 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 F10z and KPMI but lead the radiative indices and lag RZ 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.

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