Variations of the solar granulation motions with height using the GOLF/SoHO experiment

Details Variations of the solar granulation motions with height using the GOLF/SoHO experiment Variations of the solar granulation motions with height using the GOLF/SoHO experiment

2008-08-04

arxiv.org/abs/0808.0422v1

A&A 490, 1143-1149 (2008)

Astronomy and Astrophysics

Astrophysics

Paper accepted in A&A. 7 pages, 4 figures, 2 tables

Scientific paper

10.1051/0004-6361:200810344

Below 1 mHz, the power spectrum of helioseismic velocity measurements is dominated by the spectrum of convective motions (granulation and supergranulation) making it difficult to detect the low-order acoustic modes and the gravity modes. We want to better understand the behavior of solar granulation as a function of the observing height in the solar atmosphere and with magnetic activity during solar cycle 23. We analyze the Power Spectral Density (PSD) of eleven years of GOLF/SOHO velocity-time series using a Harvey-type model to characterize the properties of the convective motions in the solar oscillation power spectrum. We study then the evolution of the granulation with the altitude in the solar atmosphere and with the solar activity. First, we show that the traditional use of a lorentzian profile to fit the envelope of the p modes is not well suitable for GOLF data. Indeed, to properly model the solar spectrum, we need a second lorentzian profile. Second, we show that the granulation clearly evolves with the height in the photosphere but does not present any significant variation with the activity cycle.

Affiliated with

Also associated with

No associations

Rating

Variations of the solar granulation motions with height using the GOLF/SoHO experiment does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Variations of the solar granulation motions with height using the GOLF/SoHO experiment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variations of the solar granulation motions with height using the GOLF/SoHO experiment will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-384688