Dear Colleague, You have received information about quiet and disturbed days through WDC for Geomagnetism in Copenhagen. The indices were created by GFZ Potsdam. CONTACT PERSON: If you have any questions regarding the data please contact: Dr. Hans-Joachim Linthe Adolf-Schmidt-Observatorium Lindenstrasse 7 D-14823 Niemegk Germany E-mail: kp_index@gfz-potsdam.de Fax (or telex): +49 33 843 64 423 Phone: Acknowledgement: If the data is used in a publication kindly acknowledge: GFZ Potsdam Sincerely yours, Juergen Matzka Director, WDC Copenhagen DTU Space National Space Institute Technical University of Denmark Juliane Maries vej 30 DK-2100 Copenhagen jrgm@space.dtu.dk