NATIONAL ACADEMY OF SCIENCES NATIONAL RESEARCH COUNCIL of the UNITED STATES OF AMERICA UNITED STATES NATIONAL COMMITTEE International Union of Radio Science I ( 1975 Annual Meeting October 20-23 Sponsored by USNC/URSI in cooperation with Institute of Electrical and Electronics Engineers University of Colorado Boulder, Colorado Price $3.00 URSI/USNC 1975 Annual Meeting Condensed Technical Program Sunday, October 19 2000-2400 U.S. National Committee Meeting Sheraton Monda October 20 II-1 M~ning Communications UMC 159 III-1 Ionospheric Radio Scintillations - I UMC 156 IV-1 VLF/ELF Active and Passive Probing UMC 157 V-1/I, II, VII Extra-Terrestrial Techniques for Measuring Crustal Motions and Satellite Ranging UMC W Blrm 0900-1200 VI-1 Scattering - I RB Aud. VI-2 Antennas RB 1107 VIII-1/I Noise and Interference Measurements UMC F.R. B-la/I Auditory Effects UMC E Blrm B-lb/I Microwave Cataractogenisis UMC E Blrm 1330-1700 Combined Session UMC C Blrm 2000-2200 Evening Lecture UMC C Blrm Tuesda October 21 II-2 Sub-Surface Propagation and Communications UMC 159 1 II-3 Radio Oceanography Seasat "A ' UMC F.R. III-2 Ionospheric Radio Scintillations - II UMC 157 IV-2 Plasma Instabilities in the Magnetosphere - I UMC 158 V-2 Millimeter Wavelength Techniques UMC 156 0830-1200 VI-3 Numerical Techniques RB 1107 VI-4 Integrated and Fiber Optics - I RB Aud. VIII-2/VI Noise and Interference Models and Radio System Planning RB 1103 B-2a/I Therapeutic Applications UMC W Blrm B-2b/I Diagnostic Applications UMC W Blrm B-3/I Field Survey Instruments UMC E Blrm I-1 Measurements and Techniques RB 1103 IV-3 Plasma Instabilities in the Magnetosphere - II UMC 158 V-3/III, VIII Interference to Radio Astronomy and CCIR 1330-1700 Related Topics UMC 156 VI-5 Integrated and Fiber Optics - II RB Aud. VI-6 Scattering - II RB 1107 B-4/I Cellular and Mutagenetic Effects UMC W Blrm B-5/I Exposure Systems UMC E ·Blrm II-4 Radio Meteorology--Observations, Measurements, and Theory UMC 159 1330-1630 II-5 Radar Oceanography--Sea Surface Winds and Ocean Waves UMC F.R. III-3 Observation of Spatial and Temporal Structure of', the Ionosphere - I UMC 157 1645-1845 Commission II Business Meeting UMC 156 Commission III Business Meeting UMC 157 1800-2000 Reception Sheraton Wednesda October 22 II-6 Satellite Communications UMC 159 II-7 Radio Meteorology--Radio Propagation and Wind Measurements in Convective Storms UMC F.R. III-4 Observation of Spatial and Temporal Structure of the Ionosphere - II UMC 157 IV-4 Precipitation and Plasmas UMC 158 V-4 Galactic and Extragalactic Observations UMC 156 0830-1200 VI-7/I Inverse Scattering RB Aud. VI-8/VIII Topics in Communication Theory RB 1107 B-6a/I Behavioral Effects (Low Level Exposure) UMC E Blrm B-6b/I Behavioral Effects (High Level Exposure) UMC E Blrm B-7a/I Assessment of Power Deposition in Tissues by Mathematical and Phantom Models UMC W Blrm B-7b/I Dielectric Properties of Tissues UMC W Blrm Continued on inside back cover United States National Committee INTERNATIONAL UNION OF RADIO SCIENCE PROGRAM AND ABSTRACTS 1975 Annual Meeting October 20-23 Sponsored by USNC/URSI in cooperation with IEEE groups a~d societies: Antennas and Propagation Circuits and Systems Communications Electromagnetic Compatibility Geoscience Electronics Information Theory Instrumentation and Measurement Microwave Theory and Techniques Hosted by: The National Oceanic and Atmospheric Administration The National Bureau of Standards The Institute for Telecommunication Sciences Office of Telecommunications The University of Colorado The Denver Section, IEEE and The Denver-Boulder Chapter, IEEE/APS Boulder, Colorado NOTE: Programs and Abstracts of the USNC/URSI Meetings are available from: USNC/URSI National Academy of Sciences 2101 Constitution Avenue, N.W. Washington, D.C. 20418 The full papers are not published in any collected format; requests for them should be addressed to the authors who may have them published on their own initiative. Please note that these meetings are national and are not organ­ ized by international URSI, nor are these programs avail­ able from the international Secretariat. ii MEMBERSHIP United States National Connnittee INTERNATIONAL UNION OF RADIO SCIENCE Chairman: F.S. Johnson, University of Texas, Dallas Vice Chairman: J.V. Evans, Lincoln Laboratory, M.I.T. Secretary: C.G. Little, Environmental Research Labs, NOAA Editor: T.B.A. Senior, University of Michigan Immediate Past Chairman: A.T. Waterman, Jr., Stanford University Commission Chairmen: Connnission I: Radio Measurements and Standards George Birnbaum National Bureau of Standards Building 223, Room B 354 Washington, D.C. 20234 Connnission II: Radio and Nonionized Media Isadore Katz Applied Physics Laboratory The Johns Hopkins University 8621 Georgia Avenue Silver Springs, Maryland 20910 Commission III: On the Ionosphere John M. Kelso ITT Electro-physics Labs, Inc. 9140 Old Annapolis Road Columbia, Maryland 21043 Commission IV: On the Magnetosphere Andrew F. Nagy Dept. of Electrical Engineering University of Michigan Ann Arbor, Michigan 48104 Connnission V: Radio and Radar Astronomy Alan H. Barrett Research Laboratory of Electronics (26-457) Massachusetts Institute of Technology Cambridge, Massachusetts 02139 iii Commission VI: Radio Waves and Transmission of Information Aharon A. Ksienski ElectroScience Laboratory The Oh"io State University 1320 Kinnear Road Columbus, Ohio 43212 Commission VIII: Radio Noise and Interference George H. Hagn Stanford Research Institute 1611 North Kent Street Arlington, Virginia 22209 Persons Taking Office, January 1, 1976: Chairman: J.V. Evans, Lincoln Laboratory, M.I.T. Vice Chairman: C.G. Little, Environmental Research Labs, NOAA Secretary: J.R. Wait, U.S. Department of Commerce, Boulder Editor: T,B,A. Senior, University of Michigan Commission Chairmen: Commission I: George E. Schafer Commission II: Alfred H. LaGrone Commission III: Thomas. E. Vanzandt Commission IV: Peter M. Banks Commission V: Kenneth I. Kellerman Commission VI: Thomas B.A. Senior Commission VIII: George H. Hagn Members at Large: P.M. Banks E.E. Gossard C, I. Beard A. Ishimaru W.C. Erickson J.S. Nisbet L.B. Felsen W.F. Utlaut Officers of URS! resident in the United States: Honorary President: s. Silver Chairman, Commission I(A): H.M. Altschuler Chairman, Commission V(J): G. Westerhout Vice Chairman, Commission IV(H): F.W. Crawford Vice Chairman, Commission VI (B): L.B. Felsen Vice Chairman, Commission VIII(E): G.H. Hagn Vice Chairman, Commission II (F): A.T. Waterman iv American Geophysical Union: A.J. Dessler IEEE: E. Weber United States Government: Department of Commerce: A.H. Shapley Department of Defense: E. Paroulek Air Force: D.J. Sletten Army: A.R. Rasmussen: Navy: A.H. Schooler FCC: H. Fine NASA: E.R. Schmerling NSF: R.M. Price OTP: W. Dean, Jr. Foreign Secretary, NAS: G.S. Hammond Chairman, NRC Office of Physical Sciences: D.A. Bromley Honorary Members: R.H. Beverage A.H. Waynick V DESCRIPTION OF INTERNATIONAL UNION OF RADIO SCIENCE The International Union of Radio Science is one of 17 world scientific unions organized under the Interna­ tional Council of Scientific Unions (ICSU). It is com­ monly designated as URSI (from its French name, Union Radio Scientifique Internationale). Its aims are (1) to promote the scientific study of radio communications, (2) to aid and organize radio research requiring coopera­ tion on an international scale and to encourage the dis­ cussion and publication of the results, and (3) to facil­ itate agreement upon common methods of measurement and the standardization of measuring instruments. The Inter­ national Union itself is an organizational framework to aid in promoting these objectives. The actual technical work is largely done by the National Committees in the various countries. The officers of the International Union are: President: J. Voge (France) Immediate Past President: W.J.G, Beynon (UK) Vice Presidents: W.N. Christiansen (Australia) W.E. Gordon (USA) V.V. Migulin (USSR) F.L.H.M. Stumpers (Netherlands) Secretary General: C.M. Minnis (Belgium) Honorary Presidents: B. Decaux (France) W. Dieminger (West Germany) C. Manneback (Belgium) J.A. Ratcliffe (UK) S. Silver (USA) R.L. Smith-Rose (UK) The Secretary's office and the headquarters of the organization are located at 7 Place Emile Danco, 1180 Brussels, Belgium. The Union is supported by contribu­ tions (dues) from 35 member countries. Additional funds for symposia and other scientific activities of the Union are provided by ICSU from contributions received for this purpose from UNESCO. vi The International Union, as of the XVIII General Assembly held in Lima, Peru, August, 1975, has nine bod­ ies called Commissions for centralizing studies in the principal technical fields. The names of the Commissions and the chairmen follow. The roman numerals in parenthe­ ses indicate the designations of the most closely corre­ sponding previously existing Commissions. The listing of Commissions and chairmen of the United States National Committee in this digest uses the old designations, but formal consideration of the United States ,Commissions by the United States National Committee is pending. A, Electromagnetic Metrology (I) Altschuler (USA) B. Fields and Waves (VI) van Bladel (Belgium) C. Signals and Systems (VI) Picinbono (France) D. Physical Electronics (VII) Smolinski (Poland) E. Interference Environment (VIII) Likhter (USSR) F. Wave Phenomena in Nonionized Media (II) Eklund (Sweden) G. Ionospheric Radio (III) King (United Kingdom) H. Waves in Plasmas (IV) Gendrin (France) J. Radio Astronomy (V) Westerhout (USA) Every three years, the International Union holds a meeting called the General Assembly. The next General Assembly, the XIX, will be held in Helsinki, Finland in August 1978. The Secretariat prepares and distributes the Proceedings of these General Assemblies. The Inter­ national Union arranges international symposia on specif­ ic subjects pertaining to the work of one Commission or to several Commissions. The International Union also cooperates with other Unions in international symposia on subjects of joint interest.