EOP series (mostly operational) & comparison  

Analysis of the EOP series | Consistency of the EOP series

Updated : February 2023

Thereafter the "individual" or "intra-technique" series for VLBI, GNSS, SLR techniques are made available to users from their beginning until the present. Most of them are operational : they are are derived from current analyses, carried out with the most recent observations. Up-dated daily (GNSS) or 1/2 times per week (VLBI/SLR), they are presently used for achieving the operational combined series C04 of the EOP-PC.


They are labelled by the acronyms of the institutes or the organizations of which they originate. FORMAT OF THE SERIES can be found in the file format.eop.

Important remark concerning the application of the IAU 2000 conventions.

From the following table you can either open the series you are interested in (click on the link), or compare series after you have selected two of them, over an time span to be chosen just below (option of comparison have to be chosen below the table).


Time scale : Modified julian date Besselian year  

Début     Fin  

Select at least 2 differents EOP series and 1 common EOP :

series
IAU 19803		 series
IAU 20003		 read starting
date		 x y x-iy UT1-
UTC		 UT1-
TAI		 dψ
sinε0
UAI 1980		 dε
UAI 1980		 dψ
sinε0 +i dε		 dX
UAI 2000		 dY
UAI 2000		 dX
+i dY
UAI 2000		 dx/dt dy/dt LOD
mas mas mas ms ms mas mas mas mas mas mas mas/day mas/day ms
Select EOP
  COMBINED EOP series of our service
C04 20 C04 20 read 1962- 1 1 1 1 1 1 1 1 1 1 1 1 1 1
C04 20 12h C04 20 read 1984- 1 1 1 1 1 1 1 1 1 1 1
C04 14 C04 14 read 1962- 1 1 1 1 1 1 1 1 1 1 1 1
C04 14 12h C04 14 read 1984- 1 1 1 1 1 1 1 1 1
C01 C01 read 1846- 1 1 1 1956- 1900- 1900- 1900- 1984- 1984- 1984- 1962-
C02 read 1830- 1 1
OPAC read 2000- 1 1 1 1 1 1
OPAC2 OPAC2 read 2000- 1 1 1 1 1 1 1 1
  OTHER COMBINED EOP series
SPACE read 1993- 1 1 1 1 1 1 1 1
BUL A BUL A read 1993- 1 1 1 1996- 1996-
  GNSS EOP series
CODE 1993- 1 1 1 1 1 1 1 1
EMR 1996- 1 1 1 1 1 1 1 1
ESOC 1996- 1 1 1 1 1 1 1 1
GFZ 1996- 1 1 1 1 1 1 1 1
GRGS 2014- 1 1 1 1 1 1 1 1
IAA read 2000- 1 1 1 1 1 1
IGS Final 1996- 1 1 1 1 1 1 1 1
IGS Rapid 1996- 1 1 1 1 1 1 1 1
JPL 1996- 1 1 1 1 1 1 1 1
NOAA 1996- 1 1 1 1 1 1 1 1
SIO 1996- 1 1 1 1 1 1 1 1
  VLBI EOP series
AUS AUS read 1983- 1 1 1 1 1 1 1 1 1 1 1
BKG BKG read 1984- 1 1 1 1 1 1 1 1 1 1 1 1
CGS CGS read 1984- 1 1 1 1 1 1 1 1 1 1 1 1
GSFC GSFC read 1979- 1 1 1 1 1 1 1 1 1 1 1 1
IAA IAA read 1979- 1 1 1 1 1 1 1 1 1 1 1
IVS quaterly IVS read 1984- 1 1 1 1 1 1 1 1 1 1 1 1
IVS rapid IVS read 2005- 1 1 1 1 1 1 1 1 1 1 1 1
MAO MAO read 2000- 1 1 1 1 1 1 1 1 1 1 1
OPA OPA read 1984- 1 1 1 1 1 1 1 1 1 1 1 1 1 1
SPBU SPBU read 1989- 1 1 1 1 1 1 1 1 1 1 1
USNO USNO read 1979- 1 1 1 1 1 1 1 1 1 1 1 1
BKG int. read 2000- 1 1 1 1
GSFC int. read 2000- 1
GSI int. read 2003- 1
IAA int. read 2006- 1
IAA rapid int. read 2006- 1
OPA int. read 2006- 1
PUL int. read 2000- 1
SPBU int. read 1997- 1
USNO int. read 2000- 1
  SLR EOP series
ASI read 2003- 1 1 1 1
CSR 1983- 1 1 1 1 1
DUT 1993- 1 1 1 1 1
IAA 1992- 1 1 1 1 1 1
ILRS (comb.) 2002- 1 1 1 1
MCC 1996- 1 1 1 1
OCA 1993-2007 1 1 1 1 1
  DORIS EOP series
IDS(comb) read 1993- 1 1 1
IGN 1993-2013 1 1 1 1 1
INASAN read 1993- 1 1 1 1 1
  EOP series from optical observation
AICAS OA00 read 1900-1992 1 1 1 1 1 1 1 1
AICAS OA10 read 1900-1992 1 1 1 1 1
JPL(LOD)* read 1832-1997 1
HMNAO* read 2000BC-2016 1 1
HMNAO 2021* read 2000BC-2019 1 1
Draw selected series     Show errors
Draw formal uncertainties of the selected series    y log scale
Print paired differences (Series 2 - Series 1) and their uncertainties at the dates of the less sampled series
Draw paired differences (Series 2/3/4/... - Series 1) / compute standard deviation and bias (weigthed by the uncertainties)
Spectral analysis (FFT)    
series paired differences

    Amplitude     Power Spectral Density -> Moving average over points     Lin/Lin Lin/Log Log/Log
    min. frequency       max. frequency (in cycle per unit of time)
Least square fit of periodic components in the offsets (periods in unit of time)
Print residuals
 and Mean / Variance / Standard deviation / Allan variance order 1 / Polynomial of degree


Graphic dimension x   output graphics png   pdf   ps

    


Thank you for bringing to our knowledge any possible mistake : christian.bizouard[at]obspm.fr ([at]=@)


1Remark : the celestial pole offsets of VLBI series and combined series are provided both under the form (dψ,dε) / IAU 1980 and (dX,dY) / IAU 2000. To comply with IAU recommendations regarding high-accuracy transformation between celestial and terrestrial reference systems, it is expected that the publication of dpsi and deps representation of the celestial pole offsets with respect to the IAU 1976 precession and IAU 1980 Nutation models will stop after users have indicated that they are no longer required. Celestial pole offsets are now published in the form of dX and dY with respect to the IAU 2000 precession-nutation formulation, and a software to transform between the two representations is available from the SOFA package. Some users may prefer the parameter (dψ,dε) / IAU 2000 , and then can use the approximation (error < 1 microarcsecond over 1980-2020) : dψ sin ε0=dX, dε= dY or the accurate relation, written in the chapter 5 of the IERS 2000 conventions.
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