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

\textit{Parker Solar Probe} has shown the ubiquitous presence of strongmagnetic field deflections, namely switchbacks, during its first perihelionwhere it was embedded in a highly Alfv\'enic slow stream. Here, we study theturbulent magnetic fluctuations around ion scales in three intervalscharacterized by a different switchback activity, identified by the behaviourof the magnetic field radial component, $B_r$. \textit{Quiet} ($B_r$ does notshow significant fluctuations), \textit{weak} ($B_r$ has strong fluctuationsbut no reversals) and \textit{strong} ($B_r$ has full reversals) periods show adifferent behaviour also for ion quantities and Alfv\'enicity. However, thespectral analysis shows that each stream is characterized by the typicalKolmogorov/Kraichnan power law in the inertial range, followed by a breakaround the characteristic ion scales. This frequency range is characterized bystrong intermittent activity, with the presence of non-compressive coherentstructures, such as current sheets and vortex-like structures, and wavepackets, identified as ion cyclotron modes. Although, all these intermittentevents have been detected in the three periods, they have a different influencein each of them. Current sheets are dominant in the \textit{strong} period,wave packets are the most common in the \textit{quiet} interval; while, in the\textit{weak} period, a mixture of vortices and wave packets is observed. Thiswork provides an insight into the heating problem in collisionless plasmas,fitting in the context of the new solar missions, and, especially for\textit{Solar Orbiter}, which will allow an accurate magnetic connectivityanalysis, to link the presence of different intermittent events to the sourceregion.

Coherent events at ion scales in the inner Heliosphere: \textit{Parker Solar Probe} observations during the first Encounter