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SUMMARY:Magnetic field switchbacks and velocity spikes in the near-Sun sol
 ar wind: Parker Solar Probe first results and links to possible Solar sour
 ces - Dr Lorenzo Matteini
DTSTART:20211108T140000Z
DTEND:20211108T150000Z
UID:TALK163468@talks.cam.ac.uk
CONTACT:Dr Yamini K Rao
DESCRIPTION:Exactly three years ago\, in November 2018\, the NASA Parker S
 olar Probe (PSP) mission went through its first perihelion at 35 solar rad
 ii (Rs)\, well inside the orbit of Mercury\, corresponding then to our clo
 sest approach to Sun ever achieved before. Since then\, PSP has orbited 9 
 times around our star\, heading now for a 10th perihelion later this month
 \, and its closest approaches have gradually reached 15Rs\, meaning less t
 han 1/10th of the Sun-Earth distance\, measuring then properties of the so
 lar wind plasma very close to its solar sources for the first time.\nOne o
 f the most unexpected and intriguing finding of the first phase of the mis
 sion is the in-situ observation of ubiquitous short-living magnetic field 
 polarity reversals associated with distinct jet-like speed enhancements in
  the solar wind flow. These local folds in the interplanetary magnetic fie
 ld\, previously know as “switchbacks”\, have been already observed bef
 ore in the solar wind\, especially in plasma coming from the polar regions
  of the Sun\, however their persistence\, cadence and morphology in the ne
 ar-Sun is both new and unexpected. Moreover\, they are embedded in wind co
 ming from more equatorial Sun’s regions\, like the streamer and low-lati
 tude small coronal holes.\nIn this talk\, I will review some of the main P
 SP first results\, discussing in particular the detection of switchbacks a
 nd presenting their main properties. Different models for the generation o
 f these plasma features recently proposed in the solar wind community will
  be discussed\, ranging from interchange reconnection in the Solar atmosph
 ere to generation by spherical expansion in the interplanetary space.\nI w
 ill also show how the presence of these magnetic features\, as well as the
 ir large scale modulation that is particularly apparent in the flow closer
  to the Sun\, can offer a way to probe their source regions directly\, rev
 ealing signatures of super-granulation and perhaps also granulation.
LOCATION:Online
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