YIORL DATA CENTER A Nat iona I Academy of Sc i ences 2101 Constitution Avenue, NW Washinq<strong>to</strong>n, D.C. 20418 USA World Data Center A consists of the Coordination 0ffice and the fo I lowi nc eioht Subcenters: COORD I NAT I ON OFF I CE tlor ld Data Cenier A National Academy of Sciences 2101 Constifution Avenue, Nl,,l Washing<strong>to</strong>n, D.C. 20418 USA lTelephone: (202) 354-3359) GLACIOLOGY (Snow and |ce) ROCKETS AND SATELLITES World Data Center A: Glacioloqy World Data Center A: Rockefs and (Snow and lce) Satel I ites Cooperative Inst. for Research in Goddard Space Fliqht Center Env i ronmenta I Sc i ences Code 60 I University of Colorado Greenbelt, Maryland 20771 USA Boulder, Colorado 80i09 USA Telephone: (l0l) 344-6695 Telephone: (l0l) 492-5111 ROTATION OF THE EARTH Wor I d Data Center A: Rotat ion of the Earth MARINE GEOLOGY AND GEOPHYSICS U.S. Naval Observa<strong>to</strong>ry (Gravity, ltlaonetics, Bathymetry, Washing<strong>to</strong>n, D.C.20590 USA Seismic Profi les, Marine Sediment, Telephone: (202) 653-i502 and Rock Ana I yses ) : S0LAR-TERRESTRI AL PHYS I CS ( So lar and World Daia Center A for Marine Interplanetary Phencmena, lonospheric Geology and Geophysics Phenomena, Flare-Associated Events, NOAA, E/GC3 Geornagneiic Variations, Aurora, S75Broadvtay Cosmic Rays, Airglow): Bou I der, Co I orado B0J0l USA Te I ephone: ( l0l) 491-6481 Wor I d Data Center A for Solar-Terrestrial Phvs ics N0AA, E/GC2 METEOROLOGY (and Nuclear Radiation) 325 Broadway World Data Center A: Meteorology Boulder, Colorado B0l0l USA National Cl imatic Dafa Center Telephone: (303) 491-6323 NOAA, E/CC Federal Bui lding S0LID-EARTH GEOPHYSICS (Seismoloqy, Ashevi I le, North Carol ina 2BB0i USA Tsunamis, Gravimetry, Earth Tides, Telephone: (104) 259-0682 Recenf l4ovemenls of the Earthrs Crust, Magnetic Measuremenis, Pa I eornagnet i sm and Archeornagnet i sm, OCEANOGRAPHY Vo I cano I ogy, Geotherm i cs ) : World Data Center A: Oceanography National Oceanographic Data Center World Data Center A NOAA, E,/OC for So I i d-Earth Geophys i cs 2001 Wisconsin Avenue, NW NOAA, E,/GCI Page Bldg. l, tun. 414 325 Broadway Washing<strong>to</strong>n, D.C.20235 USA Boulder, Colorado 80J0J USA Telephone: (202) 634-7510 Telephone: (l0l) 491-6521 World Data Centers conduct international exchange of geophysical observations in accordance with the principles set forfh by the lnternational Counci I of Scientific Unions. WDC-A is established in the United States under the auspices of the National Academy of Sciences. Communicatlons regardinq data interchange matters in general and World Data Center A as a whole should be addressed <strong>to</strong> Worid Data Center A, Coordination 0ffice (see address above). lnquiries and co{nmunications concerning dafa in specific discipl ines should be addressect +^ +ha ia+a su[6snfer I isted above.
IONOGRAM ANALYSIS t.lITH THE GENERALISED PROGRAM POLAN