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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

EUV images of Comet Lovejoy (C/2011 W3) from the AIA show striations relatedto the magnetic field structure in both open and closed magnetic regions. Thebrightness contrast implies coronal density contrasts of at least a factor of 6between neighboring flux tubes over scales of a few thousand km. These densitystructures imply variations in the Alfven speed on a similar scale. They willdrastically affect the propagation and dissipation of Alfven waves, and thatshould be taken into account in models of coronal heating and solar windacceleration. In each striation, the cometary emission moves along the magneticfield and broadens with time. The speed and the rate of broadening are relatedto the parallel and perpendicular components of the velocities of the cometaryneutrals when they become ionized. We use an MHD model of the coronal magneticfield and the theory of pickup ions to compare the measurements withtheoretical predictions, in particular with the energy lost to Alfven waves asthe cometary ions isotropize.

The Solar Corona as probed by Comet Lovejoy (C/2011 W3)