7 
1 Introduction 
This report contains the results of Erdmagnetisches Observatorium Wingst for 1996, 1997, 
1998, and 1999 (year books No 42, 43, 44 and 45). 
In the years under review, Bundesamt für Seeschifffahrt und Hydrographie additionally 
published on a monthly basis: 
a) Reports on geomagnetic indices and special geomagnetic events. 
b) Reports on preliminary daily and monthly means. 
Preliminary monthly and annual mean values were prepublished in Deutsche Hydrographische 
Zeitschrift/ German Journal of Hydrography (Schulz, 1996; 1998b; 1999). 
Geomagnetic data have been provided on a regular basis to the following institutions: 
a) International Ursigram and World Days Service (IUWDS), followed by the International Space 
Environment Service (ISES) in 1997: Geomagnetic indices and geomagnetic events (daily) 
b) International Service of Geomagnetic Indices (ISGI): Geomagnetic indices and special 
geomagnetic events (monthly and annually) 
c) World Data Centers for Geomagnetism: Microfiches of variation (until 1997), pulsation 
magnetogrammes, geomagnetic indices and one-minute values (annually) 
d) INTERMAGNET (Global near-real-time magnetic observatory network): One-minute values 
(reported data via METEOSAT, hourly; adjusted data via Email, on week days); Geomagnetic 
indices and one-minute values (CDrom, annually). 
Indices and information on special events were made available through a telephone service on 
weekdays. 
Phone: +49 4778 812152 
The preliminary variations and indices can be found on the Internet on a real time basis (hourly 
updates) in graphical form at 
http://www.bsh.de/en/Marine%20data/Qbservations/Geomagnetism/obs.jsp 
or (update every 10 minutes): 
http://www.gfz-potsdam.de/pb2/pb23/GeoMag/Other/BothObs e.html 
and in numerical form (update every 10 minutes, pass word reguired): 
ftp://wng@ftp.bsh.de/outgoing/boulder 
Definitive (compressed) data from 1939 onwards (minute values since 1981) can be found at: