|
|
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.
Long history time series
of ERP, in terms of polar motion and Length-Of-Day EOP, are almost annually
estimated at ASI/CGS since 1998. The time series is obtained from a
multi-year geodetic solution analyzing the data acquired from 1983 to the
most recent data, available at the time of the solution, to estimate site
coordinates, velocities, EOP and other parameters. More details
are available in the description of the solutions.
- CGS98L01 file,
description, and
format
- CGS00L01 file,
description, and
format
- ASI04L01 file,
description, and
format
- ASI05L01 file,
description, and
format
- ASI06L01 file,
description, and
format
- ASI07L01 file,
description, and
format
Weekly time series of ERP
are estimated and distributed to the International Earth Rotation Service for
the ASI/CGS operational EOP series. The ASI EOP time series, submitted as
operational series to IERS, provides daily EOP and LOD from Lageos-I, Lageos II, Etalon I
and Etalon II data collected from the worldwide network. The terrestrial
reference frame is defined by fixing the coordinates and velocities of 10 core sites to their
ITRF values. The time series is weekly updated with the latest 8-week
estimates.
More info at the IERS
EOP Product center
|
|
|
