Bibcode
DOI
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
Citations
32
Refereed citations
22
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.