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| Paper: |
Spatial Cross Spectrum: Reducing Incoherent Convective Background of Resolved Helioseismic Instruments |
| Volume: |
416, Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21 |
| Page: |
297 |
| Authors: |
García, R. A.; Mathur, S.; González Hernández, I.; Jiménez, A. |
| Abstract: |
Measurements of low-order p modes and gravity modes are perturbed by the solar convective background. Such perturbation increases below 2 mHz for intensity measurements and 1 mHz for velocity measurements. While the low-degree modes have large spatial scales, the convective motions have much smaller spatial distribution. In this work, we take advantage of these different scale sizes to explore the use of spatial cross spectrum between different regions of the Sun. The aim is to reduce the incoherent background noise and, therefore, increase the signal-to-noise ratio of the signals that are coherent across the full disk. To do so we use the Variability of solar IRradiance and Gravity Oscillations (VIRGO)/Luminosity Oscillations Imager (LOI) instrument aboard SoHO and the Global Oscillation Network Group (GONG) ground-based network to study the intensity and velocity spatial cross spectra. |
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