Dear Colleagues, The deadline for abstract submissions to the joint 21st EISCAT Symposium 2024 and 48th Annual European Meeting on Atmospheric Studies by Optical Methods has been extended to April 14, 2024. Abstract submissions can be submitted through the conference website located at: https://uit.no/tavla/artikkel/830164/eiscat_symposium_2024 Venue: UiT The Arctic University of Norway campus, Tromsø, Norway Dates: July 29 - August 2, 2024 A notice will be sent once registration opens. For further details on the conference, please visit the conference website provided above. Sincerely, Devin Huyghebaert on behalf of the local organizing committee Science Organizing Committee: Thomas Ulich (EISCAT), Noora Partamies (UNIS), Mykola Ivchenko (KTH), Ingemar Häggström (EISCAT), Anita Aikio (Oulu), Hilde Nesse (UiB), Lisa Baddeley (UNIS), Björn Gustavsson (UiT) Local Organizing Committee at UiT: Björn Gustavsson, Devin Huyghebaert, Inger Solheim, Ingrid Mann