MHD waves from inhomogeneous accretion in T Tauri stellar magnetospheres

Details MHD waves from inhomogeneous accretion in T Tauri stellar magnetospheres MHD waves from inhomogeneous accretion in T Tauri stellar magnetospheres

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...190..178s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 190, no. 1-2, Jan. 1988, p. 178-186.

Astronomy and Astrophysics

Astrophysics

12

Magnetohydrodynamic Waves, Pre-Main Sequence Stars, Stellar Magnetic Fields, Stellar Magnetospheres, Stellar Mass Accretion, T Tauri Stars

Scientific paper

The authors consider the radiation of MHD-waves when a protostellar plasma cloud falls along an ambient magnetic field onto the surface of a T Tauri star. It is shown that the excitation mechanism is efficient in the frequency interval 0 < ω ⪉ 4 vc/rc where the infall velocity vc of the cloud is taken to be subalfvénic and rc is the radius of the cloud. The efficiency of wave-excitation is calculated and turns out to be of order 0.1 (ρc/ρ0)(vc/cA)3 for the Alfvén mode and of order 1.8 (ρc/ρ0)(vc/cA)7 for the fast mode (cA is the Alfvén speed, ρc is the mass density inside the cloud and ρ0 that of the ambient atmosphere).

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