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

Drifting pulsation structures (DPSs) are considered to be radio signatures ofthe plasmoids formed during magnetic reconnection in the impulsive phase ofsolar flares. In the present paper we analyze oscillations and waves in sevenexamples of drifting pulsation structures, observed by the 800-2000 MHzOndrejov radiospectrograph. For their analysis we use a new type of oscillationmaps which give us a much more information about processes in DPSs than that inprevious analyzes. Based on these oscillation maps, made from radio spectra bythe wavelet technique, we recognized quasi-periodic oscillations with periodsranging from about 1 to 108 s in all studied DPSs. This strongly supports theidea that DPSs are generated during a fragmented magnetic reconnection. Phasesof most the oscillations in DPSs, especially for the period around 1 s, aresynchronized ("infinite" frequency drift) in the whole frequency range of DPSs.For longer periods in some DPSs we found that the phases of the oscillationsdrift with the frequency drift in the interval from -17 to +287 MHz\s. Wepropose that these drifting phases can be caused (a) by the fast or slowmagnetosonic waves generated during the magnetic reconnection and propagatingthrough the plasmoid, (b) by a quasi-periodic structure in the plasma inflowingto the reconnection forming a plasmoid, and (c) by a quasi-periodically varyingreconnection rate in the X-point of the reconnection close to the plasmoid.

Oscillations and Waves in Radio Source of Drifting Pulsation Structures