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- W2168551471 abstract "We used long duration, high quality, unresolved (Sun-as-a star) observations collected by the ground based network BiSON and by the instruments GOLF and VIRGO on board the ESA/NASA SOHO satellite to search for solar-cycle-related changes in mode characteristics in velocity and continuum intensity for the frequency range between 2.5 mHz 6.8 mHz. Over the ascending phase of solar cycle 23 we found a suppression in the <i>p<i/>-mode amplitudes both in the velocity and intensity data between 2.5 mHz 4.5 mHz with a maximum suppression for frequencies in the range between 2.5 mHz 3.5 mHz. The size of the amplitude suppression is 13 <i>±<i/> 2 per cent for the velocity and 9 <i>±<i/> 2 per cent for the intensity observations. Over the range of 4.5 mHz 5.5 mHz the findings hint within the errors to a null change both in the velocity and intensity amplitudes. At still higher frequencies, in the so called High-frequency Interference Peaks (HIPs) between 5.8 mHz 6.8 mHz, we found an enhancement in the velocity amplitudes with the maximum 36 <i>±<i/> 7 per cent occurring for 6.3 mHz 6.8 mHz. However, in intensity observations we found a rather smaller enhancement of about 5 <i>±<i/> 2 per cent in the same interval. There is evidence that the frequency dependence of solar-cycle velocity amplitude changes is consistent with the theory behind the mode conversion of acoustic waves in a non-vertical magnetic field, but there are some problems with the intensity data, which may be due to the height in the solar atmosphere at which the VIRGO data are taken." @default.
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- W2168551471 date "2010-06-01" @default.
- W2168551471 modified "2023-10-11" @default.
- W2168551471 title "Acoustic power absorption and enhancement generated by slow and fast MHD waves" @default.
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- W2168551471 doi "https://doi.org/10.1051/0004-6361/200913091" @default.
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