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

Aims: Our goal is to develop methodologies to seamlessly track transientsolar wind flows viewed by coronagraphs or heliospheric imagers from rapidlyvarying viewpoints.  Methods: We constructed maps of intensity versus time and elongation (J-maps)from Parker Solar Probe (PSP) Wide-field Imager (WISPR) observations during thefourth encounter of PSP. From the J-map, we built an intensity onimpact-radius-on-Thomson-surface map (R-map). Finally, we constructed alatitudinal intensity versus time map (Lat-map). Our methodology satisfactorilyaddresses the challenges associated with the construction of such maps fromdata taken from rapidly varying viewpoint observations.  Results: Our WISPR J-map exhibits several tracks, corresponding to transientsolar wind flows ranging from a coronal mass ejection (CME) down to streamerblobs. The latter occurrence rate is about 4-5 per day, which is similar to theoccurrence rate in a J-map made from $\sim1$ AU data obtained with theHeliospheric Imager-1 (HI-1) on board the Solar Terrestrial RelationsObservatory Ahead spacecraft (STEREO-A). STEREO-A was radially aligned with PSPduring the study period. The WISPR J-map tracks correspond to angular speeds of$2.28 \pm 0.7$$^{\circ}$/hour ($2.49 \pm 0.95$$^{\circ}$/hour), for linear(quadratic) time-elongation fittings, and radial speeds of about 150-300 kms$^{-1}$. The analysis of the Lat-map reveals a bifurcating streamer, whichimplies that PSP was flying through a slightly folded streamer duringperihelion.  Conclusions: We developed a framework to systematically capture andcharacterize transient solar wind flows from space platforms with rapidlyvarying vantage points. The methodology can be applied to PSP WISPRobservations as well as to upcoming observations from instruments on board theSolar Orbiter mission.

Tracking solar wind flows from rapidly varying viewpoints by the Wide-field Imager for Parker Solar Probe