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Gravity modes in the Sun have been the object of a long and difficult searchin recent decades. Thanks to the data accumulated with the last generation ofinstruments (BiSON, GONG and three helioseismic instruments aboard SoHO),scientists have been able to find signatures of their presence. However, theindividual detection of such modes remains evasive. In this article, we studythe signal at 220.7 microHz which is a peak that is present in most of thehelioseismic data of the last 10 years. This signal has already been identifiedas being one component of a g-mode candidate detected in the GOLF Dopplervelocity signal. The nature of this peak is studied in particular using theVIRGO/SPM instrument aboard SoHO. First we analyse all the availableinstrumental data of VIRGO and SoHO (housekeeping) to reject any possibleinstrumental origin. No relation was found, implying that the signal has asolar origin. Using Monte Carlo simulations, we find, with more than 99%confidence level, that the signal found in VIRGO/SPM is very unlikely to be dueto pure noise.

On the solar origin of the signal at 220.7microHz: A possible component of a g mode?