SLR

*SLR DATA ANALYSIS AT THE ASI/CGS*
The SLR data analysis has a relatively long history at the Matera Centro di Geodesia Spaziale (CGS). Started in 1984 with the on-site quality control, it is now a well established activity focused on the areas of tectonic plate motion, crustal deformation, post-glacial rebound and subsidence, Earth rotation and polar motion, time variations of the Earth’s gravitational field, center of mass of the total Earth system monitoring, International Terrestrial Reference System (ITRS) maintenance, satellite orbit determination. The analysis products could be classified into two main types: *standard* and *special. The standard* are the basic products of the SLR analysis and contribute to the routinely monitoring of the terrestrial reference system through a set of coordinates and velocities of the worldwide network and the earth orientation parameters The *special* are those products requiring specific investigation and not routinely produced. They can be grouped into the following areas: - terrestrial reference frame; - precise orbit determination (POD); - gravitational field; - geocenter; - intra-technique combination/comparison. STANDARD PRODUCTS ASI/CGS Cartesian coordinates and velocities Geodetic solutions are routinely performed at the CGS and distributed to International Services for the determination and maintenance of the Terrestrial Reference Frame. Accurate determinations of station position and motion are provided on a global scale using all the available SLR data from the worlwide network. CGS98L01 sinex file and description CGS00L01 sinex file and description CGS02L01 sinex file and description ASI04L01 sinex file and description ASI06L01 sinex file and description and plots ASI/CGS Earth orientation parameters The Earth Rotation Parameters (ERP) describe the orientation of the Earth Axis, the rotation of the Earth and their variations. The ERP connect the Celestial Reference Frame to the Terrestrial Reference Frame and the variations of the ERP are a good indicator of a variety of geophysical processes originating within the Earth. The CGS routinely produces estimations of the ERP in terms of polar motion and Length-Of-Day, those products are distributed to the International Earth Rotation Service. ERP series for IERS bulletin B. Weekly solutions archived on GeoDAF and collected at IERS as operational series. (description and format) CGS98L01 file, description and format CGS00L01 file, description and format ASI04L01 file, description and format ASI06L01 file and description
SPECIAL PRODUCTS ASI/CGS contribution to specific projects The CGS is an official component of the International Laser Ranging Service (ILRS), as Associate Analysis Center, and of the International Earth Rotation and Reference System Service (IERS), as Combination Research Center. It is involved in international projects/campaigns together with worlwide analysis centers. IERS analysis campaign to align EOPs to ITRF2000/ICRF (solutions available in the data pool) IERS SINEX Combination campaign (solutions available in the data pool) ILRS Analysis Working Group Pilot Project
ASI/CGS miscellaneous solutions The data collected from the SLR network contribute to the study of the Earth system, as a whole. Ad hoc analyses are made to derive time series of various geodetic parameters, i.e. low degree geopotential zonals, geocenter. Time series of low-degree geopotential zonals and their secular drifts. Description and results SLR weekly SSC/EOP, a technical description can be found here. The SINEX files are available on request. Geocenter time series 1993-2003 (plots). Data are available on request.

SLR DATA ANALYSIS AT THE ASI/CGS

The SLR data analysis has a relatively long history at the Matera Centro di Geodesia Spaziale (CGS). Started in 1984 with the on-site quality control, it is now a well established activity focused on the areas of tectonic plate motion, crustal deformation, post-glacial rebound and subsidence, Earth rotation and polar motion, time variations of the Earth’s gravitational field, center of mass of the total Earth system monitoring, International Terrestrial Reference System (ITRS) maintenance, satellite orbit determination.
The analysis products could be classified into two main types: standard and special.
The standard are the basic products of the SLR analysis and contribute to the routinely monitoring of the terrestrial reference system through a set of coordinates and velocities of the worldwide network and the earth orientation parameters
The special are those products requiring specific investigation and not routinely produced. They can be grouped into the following areas:
- terrestrial reference frame;
- precise orbit determination (POD);
- gravitational field;
- geocenter;
- intra-technique combination/comparison.

STANDARD PRODUCTS

ASI/CGS Cartesian coordinates and velocities
Geodetic solutions are routinely performed at the CGS and distributed to International Services for the determination and maintenance of the Terrestrial Reference Frame.
Accurate determinations of station position and motion are provided on a global scale using all the available SLR data from the worlwide network.

CGS98L01 sinex file and description
CGS00L01 sinex file and description
CGS02L01 sinex file and description
ASI04L01 sinex file and description
ASI06L01 sinex file and description and plots

ASI/CGS Earth orientation parameters
The Earth Rotation Parameters (ERP) describe the orientation of the Earth Axis, the rotation of the Earth and their variations. The ERP connect the Celestial Reference Frame to the Terrestrial Reference Frame and the variations of the ERP are a good indicator of a variety of geophysical processes originating within the Earth. The CGS routinely produces estimations of the ERP in terms of polar motion and Length-Of-Day, those products are distributed to the International Earth Rotation Service.

ERP series for IERS bulletin B. Weekly solutions archived on GeoDAF and collected at IERS as operational series. (description and format)
CGS98L01 file, description and format
CGS00L01 file, description and format
ASI04L01 file, description and format
ASI06L01 file and description

SPECIAL PRODUCTS

ASI/CGS contribution to specific projects
The CGS is an official component of the International Laser Ranging Service (ILRS), as Associate Analysis Center, and of the International Earth Rotation and Reference System Service (IERS), as Combination Research Center. It is involved in international projects/campaigns together with worlwide analysis centers.

IERS analysis campaign to align EOPs to ITRF2000/ICRF (solutions available in the data pool)
IERS SINEX Combination campaign (solutions available in the data pool)
ILRS Analysis Working Group Pilot Project

ASI/CGS miscellaneous solutions
The data collected from the SLR network contribute to the study of the Earth system, as a whole. Ad hoc analyses are made to derive time series of various geodetic parameters, i.e. low degree geopotential zonals, geocenter.

Time series of low-degree geopotential zonals and their secular drifts. Description and results
SLR weekly SSC/EOP, a technical description can be found here. The SINEX files are available on request.
Geocenter time series 1993-2003 (plots). Data are available on request.

Contact:
Cinzia Luceri for questions or comments about ASI SLR solutions

SELECTED PUBLICATIONS

G. Bianco, R. Devoti, M. Fermi, V. Luceri, P. Rutigliano and C. Sciarretta, Estimation of low degree geopotential coefficients using SLR data, Planet. Space Sci., vol. 46, no.11/12, pp.1633-1638, 1997.
L.L.A. Vermeersen, R. Sabadini, R. Devoti, V. Luceri, P. Rutigliano, C. Sciarretta and G. Bianco, Mantle viscosity inferences from joint inversions of Pleistocene deglatiation-induced changes in geopotential with a new SLR analysis and polar wander, Geophys. Res. Lett., 25(23), 4261-4264, 1998.
G. Bianco, R. Devoti, M. Fermi, V. Luceri, P. Rutigliano and C. Sciarretta, A contribution in the estimation of tectonic motion in crucial areas: the CGS96 SLR solution, Tectonophysics, 294, 225-236, 1998.
R. Devoti, V. Luceri, P. Rutigliano, C. Sciarretta, G. Bianco, Secular drifts of low degree Zonals obtained from SLR Geodetic Satellites”,.In: proceedings 11th International Workshop on Laser Ranging (Deggendorf), vol.1, 22-27, 1999
R.Devoti, V.Luceri, P.Rutigliano, C.Sciarretta, G Bianco, Time series of low degree zonals obtained analysing different geodetic satellites, Bollettino di Geofisica Teorica ed Applicata, vol.40, 353-358, 1999
R. Devoti, M.Fermi, C.Ferraro, R.Lanotte V.Luceri, A.Nardi, R.Pacione, P.Rutigliano, C.Sciarretta, G.Bianco, F.Vespe, Height Time Series of the Italian GPS Fiducial Network compared with VLBI and SLR Estimations, In: Towards an Integrated Global Geodetic Observing System (IGGOS), IAG Symposia (120) 130-133, 2000
R. Devoti, M.Fermi, C.Ferraro, R.Lanotte V.Luceri, A.Nardi, R.Pacione, P.Rutigliano, C.Sciarretta, G.Bianco, F.Vespe, Earth Orientation Parameters measured by Space Geodesy Techniques, In: Towards an Integrated Global Geodetic Observing System (IGGOS), IAG Symposia (120) 177-179, 2000
G. Bianco, R. Devoti, M. Fermi, C. Ferraro, R. Lanotte, V. Luceri, A. Nardi, R. Pacione, P. Rutigliano, C. Sciarretta and F. Vespe, Investigation on the combination of space geodetic techniques, J. Geodyn. 30, 337-353, 2000.
G. Bianco, R. Devoti, V. Luceri, C. Sciarretta, A Review of SLR Contributions to Geophysics in Eurasia by CGS, Survey in Geophysics vol.22, nos. 5-6,481-490, 2001
R. Devoti, C. Ferraro, E. Gueguen, R. Lanotte, V. Luceri, A. Nardi, R. Pacione, P. Rutigliano, C. Sciarretta, G. Bianco, F. Vespe, Geophysical interpretation of geodetic deformations in the central Mediterranean area, AGU Book Geodynamics Series "Plate Boundary Zones, vol.30, 2002, 57-65 2001
G. Bianco, M. Chersich, R. Devoti, V. Luceri, M. Selden, Measurements of LAGEOS-2 rotation by Satellite Laser Ranging observations, Geophys. Res. Lett., 28(10) (2001), 2113-2116
R. Devoti, V. Luceri, C. Sciarretta, G. Bianco, G. Di Donato, L.L.A. Vermeersen and R. Sabadini, The SLR secular gravity variations and their impact on the inference of mantle rheology and lithospheric thickness, Geophys. Res. Lett., 28(5), 855-858, 2001.
R. Devoti, C. Ferraro, E. Gueguen, R. Lanotte, V. Luceri, A. Nardi, R. Pacione, P. Rutigliano, C. Sciarretta and F. Vespe, Geodetic control on recent tectonic movements in the central Mediterranean area, Tectonophysics 346, 151-167, 2002
R.Sabadini, G.Di Donato, L.L.A. Vermeersen, R. Devoti, V. Luceri, G. Bianco, Ice mass loss in Antarctica and stiff lower mantle viscosity inferred from the long wavelength time dependent gravity field, Geophys. Res. Lett., 29(10) (2002)

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