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EOP series (mostly operational) & comparison  

Analysis of the EOP series | Comparison C04 - Operational series | Consistency of the EOP series |

Updated : December 2015

Thereafter the "individual" series for VLBI, GPS, 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 (GPS) 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 two differents EOP series and 1 common EOP :

series
IAU 1980
2
series
IAU 2000
2
read starting
date
x y x-iy UT1-
UTC
UT1-
TAI

sinε0
UAI 1980

UAI 1980

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 C04 read 1962- 1 1 1 1 1 1 1 1 1 1 1 1
C01 C01 read 1846- 1 1 1 1962- 1962- 1900- 1900- 1900- 1984- 1984- 1984-
C02 read 1830- 1 1
  OTHER COMBINED EOP series
SPACE read 1993- 1 1 1 1 1 1 1 1
BUL A BUL A read 1846- 1 1 1 1996- 1996-
  GPS 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
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
OPA int. read 2006- 1
PUL int. read 2000- 1
SPBU int. read 1997- 1
USNO int. read 2000- 1
  SLR EOP series
CGS 2003- 1 1 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- 1 1 1 1 1
  DORIS EOP series
CNES 1999- 1 1 1
JPL 1993- 1 1 1 1 1
  EOP series from optical observation
AICAS read 1900-1992 1 1 1 1 1 1 1 1
AICAS read 1900-1992 1 1 1 1 1
JPL(LOD)* read 1832-1997 1
Draw selected series     Show errors
Print offsets (Series 2-Series 1) and their uncertainties at the dates of the less sampled series

Draw offsets (Series 2-Series 1) / compute standard deviation and bias (weigthed by the uncertainties)

Spectral analysis (FFT)    
both series offsets

    Amplitude Amplitude**2 Log_10(amplitude**2)
    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 will continue to be published in the form of dX and dY with respect to the IAU 2000 precession-nutation formulation, and software to transform between the two representations is available. 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, of which the programmation is proposed here (see IAU package 2000)