Volume 384, Number 2, MarchIII 2002
|Page(s)||638 - 649|
|Section||Planets and planetary systems|
|Published online||15 March 2002|
The intensity-velocity phase difference with Magneto-Optical Filters
Osservatorio Astronomico di Capodimonte, Via Moiarello 16, 80131 Napoli, Italy
Corresponding author: P. F. Moretti, email@example.com
Accepted: 22 November 2001
The phase difference between the intensity and velocity signals is a powerful diagnostic for the dynamics of the solar atmosphere. The phases are used to quantify the nonadiabatic degree of the acoustic modes and, recently, to infer the characteristics of the source of the solar oscillations. For this reason, the error attributed to the phase obtained from the observations plays an important role in distinguishing between different phenomena. In this paper we discuss the results obtained with the systems using a Magneto-Optical Filter. A model to correct for the contamination induced by the velocity in the intensity signal is described and the phases in the sodium D lines presented. We also discuss the difference between the results obtained when the phase values are computed with a local analysis or when the diagram is obtained.
Key words: Sun: oscillations / instrumentation: miscellaneous / methods: data analysis
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.