[ursi-commission-g] URSI General Assembly - New Delhi - October 23-29 2005
Paul Cannon
pcannon at qinetiq.com
Tue Feb 1 05:29:27 EST 2005
Colleagues
Can we please draw you attention to the following URSI General Assembly sessions appropriate to Commission G. Please note that the deadline of abstract submission was February 1, 2005, but now it has been extended to February 15, 2005. You may submit your abstract online through website: http://www.ursiga2005.org.
kind regards
Christian Hanuise and Paul Cannon
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G01a - Imaging of the ionosphere (I,C,P)
Thursday 27/10/2005 14:00 - 16:20 / Oral Session / 7 papers / Room CC-5
Convener: B. Wilson (USA) / email: brian.wilson at jpl.nasa.gov
Co-convener(s): M. Codrescu (USA) , C. Mitchell (UK)
Summary
This special session seeks to review the latest developments in the field of ionospheric data assimilation and tomography. Papers dealing with the need for ionospheric imaging, methods, and their strengths and limitations, and uncertainties related to the measurements, models and imaging results are welcome. Papers about the implications of imaging for both space weather operations and future research will also be considered. This is a field where measurements and models work together for the advancement of both.
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G01b - Imaging of the ionosphere (I,C,P)
Saturday 29/10/2005 09:00 - 11:40 / Oral Session / 10 papers / Room CC-5
Convener: B. Wilson (USA) / email: brian.wilson at jpl.nasa.gov
Co-convener(s): M. Codrescu (USA) , C. Mitchell (UK)
Summary
(Session continuation)
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G02a - Ionospheric effects on radio systems (I,C,P)
Wednesday 26/10/2005 09:00 - 12:40 / Oral Session / 7 papers / Room CC-5
Convener: H. Chandra (India) / email: hchandra at prl.ernet.in
Co-convener(s): P. Lassudrie (France)
Summary
This session includes ionospheric effects on terrestrial and earth-space propagation at all latitudes. The frequencies involved range from VLF to microwaves. Systems to be considered include radio communications systems, the Global Navigation Satellite System, satellite SAR imagery and ocean altimetry by satellite borne radars
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G02b - Ionospheric effects on radio systems (I,C,P)
Wednesday 26/10/2005 15:20 - 18:00 / Oral Session / 7 papers / Room CC-5
Convener: H. Chandra (India) / email: hchandra at prl.ernet.in
Co-convener(s): P. Lassudrie (France)
Summary
(Session continuation)
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G03 - Electron density profiling and validation (I,C,P)
Thursday 27/10/2005 09:00 - 12:40 / Oral Session / 10 papers / Room CC-5
Convener: J. Foster (USA) / email: jcf at haystack.mit.edu
Co-convener(s): D. Bilitza (USA)
Summary
This session will review the advances made in accurately measuring and modelling the electron density profile in the ionosphere. The different data sources and modelling approaches will be discussed with special emphasis on recent improvements. An important focus of this session will be on the comparison of data from different techniques and on comparisons between data and models. Validation of ionospheric models in regions that are critical for model applications and users are of particular interest. The session will include solicited as well as contributed papers.
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G04 - Open session and latest results (I,C,P)
Monday 24/10/2005 09:00 - 12:40 / Oral Session / 10 papers / Room CC-5
Convener: P. Wilkinson (Australia) / email: phil at ips.gov.au
Co-convener(s): J. Wu (China CIE)
Summary
This session welcomes the latest results related to Commission G terms of references, i.e. studies of the ionosphere in order to provide the broad understanding necessary to support space and ground-based radio systems
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G05a - Small-scale structures (decameter and less) in the ionosphere (I,C,P)
Friday 28/10/2005 09:00 - 11:40 / Oral Session / 7 papers / Room CC-5
Convener: J.P. St Maurice (Canada) / email: jstmauri at uwo.ca
Co-convener(s): J. Chau (Peru)
Summary
The ionosphere is being probed, trough its irregularities, by a steadily growing number of radars operating at 10 MHz and higher frequencies. The irregularities indicate not just where plasma instabilities are generated but they also can give an indication of the Dopppler shift of the plasma and of the degree of turbulence. However, the usefulness of the information can be limited by our understanding of the irregularities, be it because we do not understand their nonlinear evolution or because we do not even understand their origin. This session will seek to establish where we currently stand in our understanding of the small-scale ionospheric structures at all latitudes, both in the E and F region. We invite contributions that could shed some light on irregularity generation and evolution and welcome papers dealing with all aspects of the problem, namely: observations, theory and numerical modelling irrespective of latitudes.
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G05b - Small-scale structures (decameter and less) in the ionosphere (I,C,P)
Friday 28/10/2005 15:20 - 18:00 / Oral Session / 10 papers / Room CC-5
Convener: J.P. St Maurice (Canada) / email: jstmauri at uwo.ca
Co-convener(s): J. Chau (Peru)
Summary
(Session continuation)
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GF1a - Atmosphere-ionosphere sounding by using global navigation satellite systems (I,C,P)
Monday 24/10/2005 15:20 - 18:00 / Oral Session / 7 papers / Room CC-5
Convener: N. Jakowski (G, Germany) / email: norbert.jakowski at dlr.de
Co-convener(s): P. Spalla (G, Italy)
Summary
Ground and space based measurements using the global navigation satellite systems (GNSS) became a powerful tool for sounding the neutral and ionized atmosphere up to about 3 Earth radii. Ground based GNSS techniques have been successfully used to estimate integrated water vapor in the troposphere and to deduce the total electron content (TEC) of the ionosphere even to reconstruct the three-dimensional distribution of the observables by applying tomographic techniques. Low Earth Orbiting (LEO) satellites carrying GPS receiver onboard provided limb-sounding or radio occultation data sets from which vertical refractivity profiles of the atmosphere/plasmasphere systems can be derived effectively. LEO missions such as Oerstedt, CHAMP and SAC-C have significantly contributed to the improvement of measuring techniques, retrieval algorithms and assimilation tools. In this session we highlight the advances in GNSS sounding of the neutral atmosphere and ionosphere. Considering the existing ground based GNSS networks and satellite missions carrying GPS receiver on board, GNSS data will be increasingly available in real-time or near-real-time for feeding physics-based specification and forecast models. Hence, papers dealing with the above mentioned issues including data sources, data assimilation techniques and corresponding models are welcome
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GF1b - Atmosphere-ionosphere sounding by using global navigation satellite systems (I ,C / 10)
Tuesday 25/10/2005 09:00 - 12:40 / Oral Session / 10 papers / Room CC-5
Convener: N. Jakowski (G, Germany) / email: norbert.jakowski at dlr.de
Co-convener(s): P. Spalla (G, Italy)
Summary
(Session continuation)
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GHJ - Novel ground-based radio techniques for studying the sun-earth plasma environment (I, C / 7)
Tuesday 25/10/2005 14:00 - 16:20 / Oral Session / 7 papers / Room CC-5
Convener: C. Hanuise (G, France) / email: hanuise at cnrs-orleans.fr
Co-convener(s): B. Thide (H, Sweden) , H. Butcher (J, Netherlands)
Summary
This session will deal with new techniques and methods using radio waves and supplementary observations with optical and remote sensing methods to study the ionosphere, mesosphere and thermosphere and the relation to the lower atmosphere as well as its coupling with the magnetosphere and the solar wind. The topics include for instance: new ground-based and space-borne HF-radar and radio projects to sound the ionosphere, magnetospheric sounding and imaging, radar and radio wave propagation applications for study of space-weather effects, radar interferometry and imaging in space, the capability of HF to UHF radio astronomy for high resolution measurements of the ionosphere, magnetosphere and solar wind plasma.
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GP1 - GENERAL POSTER SESSION COMMISSION G (P)
- / Poster Session / Room HNG
Convener: P. Cannon (UK) / email: pcannon at qinetiq.com
Co-convener(s): B. Zolesi (Italy)
Summary
Contributed results related to the terms of reference of the Commission
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GP2 - Computation and networking in ionospheric radar systems (C,P)
- / Poster Session / Room HNG
Convener: J. Sahr (USA) / email: jssahr at geophys.washington.edu
Co-convener(s): T. Grydeland (Norway)
Summary
Modern radio remote sensing instruments have made excellent use of advances in computation and networking. For this reason we solicit papers describing recent advances in radio remote sensing in which the advances rely upon computation (inverse problems/ tomography; automatic parameter estimation; signal cleaning and clutter removal) and networking (distributed radar systems). In addition, we encourage presenters to describe related and prognostic work, such as protocols and techniques for software radar systems.
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GT - TUTORIAL G - Radar imaging - Radar Imaging
Friday 28/10/2005 11:40 - 12:40 / Lecture Session / Room MC-E
Convener: C. Hanuise (Commission Chair) / email: hanuise at cnrs-orleans.fr
Co-convener(s): P.S. Cannon (Commission Vice-chair)
Lecturer: R. Woodman (Peru)
Summary
Radio Imaging has been used for quite some time in Radio and Radar Astronomy. Its use is relatively new for ionospheric and atmospheric applications using coherent radar techniques, although it has experienced a very rapid development. For an intuitive understanding, it is useful to make and analogy of the radio imaging technique with an optical camera. The process is similar; the main difference being the wave length used and the possibility to record the radio electromagnetic field as a continuous time series. In an optical camera the field at the aperture or iris carries all the information of the outside world which will eventually form the image at the focal plane. Both fields are in fact Fourier transforms (or Fourier like) of each other. The body of the camera effectively carries out this transformation. In radio imaging the antenna aperture is the analog of the iris. Until recently the radio electromagnetic field at the aperture was operated upon to produce only one point of the image, that corresponding to the pointing direction of the antenna. In optics, this would have been equivalent to use only one photosensitive grain of a silver salt at the focal plane This artificial limitation is circumvented with the imaging techniques by sampling the field at the aperture by separate antenna elements and receivers and carrying the necessary Fourier like transformations in a computer, in digital form. What is interesting and not necessarily obvious is that, if the number of degrees of freedom of the image is not very large, one does not need to sample at all the available points of the radio analog of the optical aperture. One needs only as many samples as the number of degrees of freedom the image has and the use of parameter estimation theory and other optimum inversion algorithms.
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