[WHPI] PSP's 8th perihelion observing campaign April 28th-May7th, 2021

[Whole Heliosphere and Planetary Interactions]

*PSP's 8th perihelion observing campaign April 28th-May7th, 2021*

Dear collegues,

we are approaching PSP's 8th perihelion on April 29th, 2021, at which 
PSP, Solar Orbiter (at 0.9 AU), and Maven are near-radially aligned. We 
expect that several small- to medium-sized coronal holes will be on the 
Sun which high-speed solar wind streams should be seen by PSP, Solar 
Orbiter, Maven, Stereo-A, and at Earth. As this perihelion takes place 
in the summer time, we are for the first time also supported by the 
high-resolution solar telescopes GREGOR and SST in Tenerife. This gives 
us a great opportunity for coordinated, targeted observations and 
modeling of the high-speed streams, starting from their solar source 
coronal holes, their acceleration up to PSP, and their further evolution 
in the inner heliosphere. We encourage everyone to take observations and 
form collaborations, to deepen our understanding on the propagation of 
high-speed streams throughout the inner heliosphere.

Thanks to everyone for their help and support. We look forward to this 
great opportunity!

Best regards,

     Stefan Hofmeister, Giuliana de Toma, and the WHPI team

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