1. Celebrating the 200th Anniversary of the Birth of Hermann Ludwig Ferdinand von Helmholtz (31.08.1821–08.09.1894)

   • David G. Dritschel
   • Mikhail A. Sokolovskiy
   • Mark A. Stremler

   Announcement 08 October 2021 Pages: 463 - 466

   

2. Ring Configurations of Point Vortices in Polar Atmospheres

   • David G. Dritschel

   OriginalPaper 08 October 2021 Pages: 467 - 481

   

3. Something Old, Something New: Three Point Vortices on the Plane

   • Mark A. Stremler

   OriginalPaper 08 October 2021 Pages: 482 - 504

   

4. Three-dimensional Quasi-geostrophic Staggered Vortex Arrays

   • Jean N. Reinaud

   OriginalPaper 08 October 2021 Pages: 505 - 525

   

5. Resonances in the Stability Problem of a Point Vortex Quadrupole on a Plane

   • Leonid G. Kurakin
   • Irina V. Ostrovskaya

   OriginalPaper 08 October 2021 Pages: 526 - 542

   

6. Interaction of an Upwelling Front with External Vortices: Impact on Cross-shore Particle Exchange

   • Charly de Marez
   • Xavier Carton

   OriginalPaper 08 October 2021 Pages: 543 - 561

   

7. Evolution of the Singularities of the Schwarz Function Corresponding to the Motion of a Vortex Patch in the Two-dimensional Euler Equations

   • Giorgio Riccardi
   • David G. Dritschel

   OriginalPaper 08 October 2021 Pages: 562 - 575