A high frequency and high l resolution intensity-velocity phase differences from GONG data

Details A high frequency and high l resolution intensity-velocity phase differences from GONG data A high frequency and high l resolution intensity-velocity phase differences from GONG data

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..669o&link_type=abstract

In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,

Computer Science

5

Helioseismology, Data Analysis, Plane Differences

Scientific paper

We analysed 9 GONG months (324 days) of intensity (I) and velocity (V) data to produce I and V power, I-V phase difference and coherence spectra with high resolution in both frequency and spherical harmonic degree l, for the frequency range 0 - 8.3mHz and for l = 0 - 50. This analysis confirms that the steplike behaviour of the solar background phase differences, with negative values below ~3.3mHz and positive values above ~4mHz, extends to low-l values, at least down to l = 4. The two-dimensional (frequency and degree l) phase differences and coherence are particularly suitable to isolate the p-modes and the background at low-l values and low frequencies, where the leakage peaks are resolved. In this way, we can better estimate the phase difference and the power of the solar background. Furthermore, we used one GONG month of data to compute the l-averaged profiles of I and V power, I-V phase difference and coherence, for the p-modes with radial order n = 2 and l = 160 - 200. These new high resolution measurements and the p-mode mean profiles can be used to improve our knowledge of the nature of the solar background and its relation with the acoustic p-modes.

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