Work

Lifetimes of High-[CLC][ITAL]l[/ITAL][/CLC] Solar [CLC][ITAL]p[/ITAL][/CLC]-Modes from Time-Distance Analysis

Year: 2001

Type: article

Abstract: The amplitude of the cross-correlation function of solar p -modes in time-distance analysis decreases exponentially with travel distance (or travel time). We interpret this phenomenon as the dissipation of solar p -mode power and use the rate of decrease in the amplitude of the cross-correlation function to determine the lifetime of high-degree solar p -modes that cannot be accurately determined from the conventional method, measurements of line widths of p -mode power spectra, because of mode mixture. In this study, we determine the lifetimes of p -modes in the range l = 200-600 and ν = 2.5-5.5 mHz, where l is the spherical harmonic degree and ν is the frequency. The lifetime decreases with l for frequency less than about 4.7 mHz. For a fixed l , the frequency dependence has a general trend: the lifetime is approximately constant at intermediate frequency and decreases at high frequency.

Source: The Astrophysical Journal

DOI: 10.1086/321713

Authors: Dean-Yi Chou, Alexander Serebryanskiy, Yi-Jen Ye, De-Chang Dai, Shukur Khalikov

Institutions: National Tsing Hua University, Isaac Newton Institute, Ministry of Education, Ulugh Beg Astronomical Institute

Language: English

Topic: Solar and Space Plasma Dynamics

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

OpenAlex ID: W1540000741

FWCI:

Cites: 5

Cited by: 6

Related to: 10