Disk-integrated Intensity Pseudomodes Measured by SOHO/VIRGO

Bibcode
2005ApJ...623.1215J
DOI
10.1086/428879
Jiménez, A.; Jiménez-Reyes, S. J.; García, R. A.
Bibliographical reference

The Astrophysical Journal, Volume 623, Issue 2, pp. 1215-1220.

Advertised on:
4
2005
Journal
The Astrophysical Journal
Number of authors
3
IAC number of authors
2
Citations
31
Refereed citations
21
Description
The high-frequency spectrum above the acoustic cutoff frequency (νac) of the solar atmosphere has been observed in velocity measurements at low and high angular degrees and reveals significant evidence for the presence of pseudomodes characterized by their equally spaced signal. In this paper we study this region of the spectra using for the first time disk-integrated intensity measurements from the VIRGO/SPM photometers on board the SOHO probe. These pseudomodes have high visibility, and whereas the frequency separation between the pseudomodes is the same, some differences are found among the three wavelengths. We have studied the evolution of the pseudomodes with the solar cycle; nevertheless, no significant variations are found. Finally, the intensity pseudomodes of VIRGO/SPM are compared with those of velocity as seen by the GOLF instrument during the same periods and with the same analytical techniques.
Type
Refereed
Helioseismology

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