Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.g31a0791h&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #G31A-0791
Astronomy and Astrophysics
Astronomy
6954 Radio Astronomy, 6964 Radio Wave Propagation, 2400 Ionosphere, 2447 Modeling And Forecasting, 1243 Space Geodetic Surveys
Scientific paper
Like other space geodetic techniques VLBI observations are carried out at two distinct frequencies in order to determine ionospheric delay corrections. Each ionospheric delay corresponds to the total electron content (TEC) along the ray path through the ionosphere. Because VLBI is a differential technique the observed ionospheric delays represent the differences of the behaviour of the propagation media above each two stations. Additionally an instrumental offset, independent of azimuth and elevation in which the antennas point, is contained in the measurements. Due to the sparse geographical distribution of VLBI stations and the fact that this technique is not observing every day it is suggested to derive station-specific TEC values only. These results can be used to validate the TEC values derived by other space geodetic techniques or they can be incorporated into long-term studies of the ionosphere because already now VLBI observations cover more than two complete solar cycles. A combination with GPS should improve the models, because both techniques are almost always co-located. Finally a combined long-term model of the ionosphere that uses VLBI, GPS, and satellite altimetry data back to the date of implementation of each technique will be derived. This model should be able to predict the ionosphere on longer timescales, i.e. at least over months.
Hobiger Thomas
Kondo Toshiaki
Schuh Haral
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