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- W2018775982 abstract "view Abstract Citations (56) References (45) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Stellar fibril magnetic systems. I - Reduced energy state Parker, E. N. Abstract The remarkable fibril structure of the magnetic fields at the surface of the sun (with fibrils compressed to 1,000-2,000 gauss) lies outside existing statistical theories of magnetohydrodynamic turbulence. The total energy of the fibril field is enhanced by a factor of more than 100 above the energy for the mean field in a continuum state. The magnetic energy density within a fibril is of the order of 100 times the local kinetic energy density, so that no simple application of equipartition principles is possible. It is pointed out that the total energy of the atmosphere (thermal + gravitational + magnetic) is reduced by the fibril state of the field by avoiding the magnetic inhibition of the convective overturning, suggesting that the formation of the observed intense fibril state may be in response to the associated energy reduction. Calculation of the minimum total energy of a polytropic atmosphere permeated by magnetic fibrils yields theoretical fibril fields of the order of 1-5 kilogauss when characteristics appropriate to the solar convective zone are introduced, in rough agreement with the actual fields of 1-2 kilogauss. The polytrope model, although crude, establishes that a large reduction in total energy is made possible by the fibril state. Publication: The Astrophysical Journal Pub Date: August 1984 DOI: 10.1086/162312 Bibcode: 1984ApJ...283..343P Keywords: Magnetohydrodynamics; Stellar Atmospheres; Stellar Magnetic Fields; Polytropic Processes; Solar Magnetic Field; Stellar Models; Astrophysics full text sources ADS |" @default.
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- W2018775982 date "1984-08-01" @default.
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- W2018775982 title "Stellar fibril magnetic systems. I - Reduced energy state" @default.
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