The behaviour of the diamagnetic current modified MRI in different rotation  profiles

Suzan DOĞAN

Makale detayları

The behaviour of the diamagnetic current modified MRI in different rotation profiles

Yazarlar:

Suzan DOĞAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2019 Vol.43 Issue 5, pp.481-492

Belge Tipi:

Makale

Yayın Tarihi:

9/2019

Belge Dili:

İngilizce

Document ID (Org No.):

2000758943

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Özet:

 

Magnetohydrodynamic turbulence driven by magnetorotational instability (MRI) has been widely accepted  as an efficient mechanism for transporting angular momentum radially outward in the discs. Previously, we have  shown the triggering effect of the magnetization currents and the gradients produced by these currents on MRI for  Keplerian discs. In this work, we examine the properties of the diamagnetic current modified MRI for the discs where  the epicyclic frequencies deviate from Keplerian behaviour. We show that the diamagnetic effect modifies the instability  both for an increasing and for a decreasing angular momentum with radius. The novel unstable region produced by  magnetization effects still exists even if dΩ2 /dR > 0, where Ω(R) is the angular velocity. Inclusion of the diamagnetic  effect increases the maximum dimensionless growth rate sm = 0.25 which was found from the classical MRI to sm =  0.59 for an outwardly increasing angular velocity profile with κ2 > 4Ω2 , where κ is the epicyclic frequency. Moreover,  the maximum dimensionless growth rate is obtained as sm = 8.58 for a an outwardly decreasing angular velocity profile  with 0 < κ2 < Ω2. Decreasing the magnetic field strength which is already weak, leads to more rapid growth in any  differential rotation profile.

Makale detayları

The behaviour of the diamagnetic current modified MRI in different rotation profiles

Yazarlar: Suzan DOĞAN

Yayıncı: TUBITAK

Dergi: Turkish Journal of Physics 2019 Vol.43 Issue 5, pp.481-492

Belge Tipi: Makale

Yayın Tarihi: 9/2019

Belge Dili: İngilizce

Document ID (Org No.): 2000758943

Sıklık: İki Aylık

eISSN: 1303-6122

pISSN: 1300-0101

Sayı

Yazarlar:

Suzan DOĞAN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2019 Vol.43 Issue 5, pp.481-492

Belge Tipi:

Makale

Yayın Tarihi:

9/2019

Belge Dili:

İngilizce

Document ID (Org No.):

2000758943

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101