English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We investigate the effects of heating generated by damping of Alfven waves onprotostellar accretion disks. Two mechanisms of damping are investigated,nonlinear and turbulent, which were previously studied in stellar winds(Jatenco-Pereira & Opher 1989a, b). For the nominal values studied, f=deltav/v_{A}=0.002 and F=varpi/Omega_{i}=0.1, where delta v, v_{A} and varpi are theamplitude, velocity and average frequency of the Alfven wave, respectively, andOmega_{i} is the ion cyclotron frequency, we find that viscous heating is moreimportant than Alfven heating for small radii. When the radius is greater than0.5 AU, Alfvenic heating is more important than viscous heating. Thus, even forthe relatively small value of f=0.002, Alfvenic heating can be an importantsource of energy for ionizing protostellar disks, enabling angular momentumtransport to occur by the Balbus-Hawley instability.Comment: 21 pages, 9 figures. Accepted for publication in Ap

Alfvenic Heating of Protostellar Accretion Disks