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Pure and Applied Geophysics

, Volume 166, Issue 8–9, pp 1499–1517 | Cite as

Earth Rotation Observed by Very Long Baseline Interferometry and Ring Laser

  • P. J. Mendes Cerveira
  • J. Boehm
  • H. Schuh
  • T. Kluegel
  • A. Velikoseltsev
  • K. U. Schreiber
  • A. Brzezinski
Article

Abstract

We present a systematic and unified treatment of Earth rotation from the geodetic, astronomical, and geophysical point of view. A precise terminology of precession-nutation and polar motion is of great importance for understanding the interacting physical phenomena leading to rotational irregularities of the Earth. In total, four poles of the equatorial plane are defined for the description of Earth rotation. The various components of the Earth Orientation Parameters, i.e., precession-nutation, polar motion, and universal time (or length of day) are summarized. This paper shows how very long baseline interferometry and ring laser differ in terms of Earth rotation and presents the current state-of-the-art measurement accuracy that can be achieved.

Keywords

Earth rotation very long baseline interferometry ring laser reference frame 

Nomenclature

CIP

Celestial Intermediate Pole

e-VLBI

Electronic VLBI

ENSO

El Niño Southern Oscillation

EOP

Earth Orientation Parameters

FCN

Free Core Nutation

FICN

Free Inner Core Nutation

GCRF

Geocentric Celestial Reference Frame

GPS

Global Positioning System

IAG

International Association of Geodesy

IAU

International Astronomical Union

IERS

International Earth rotation and Reference system Service

IRP

Instantaneous Rotation Pole

IRV

Instantaneous Rotation Vector

ITRF

International Terrestrial Reference Frame

LOD

Length of day

MJD

Modified Julian Date

MJO

Madden-Julian Oscillation

NDFW

Nearly Diurnal Free Wobble

PM

Polar motion

PN

Precession-nutation

SG

Superconducting gravimeter

UT1

Universal Time

UTC

Universal Time Coordinated

VLBI

Very Long Baseline Interferometry

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Copyright information

© Birkhäuser Verlag, Basel 2009

Authors and Affiliations

  • P. J. Mendes Cerveira
    • 1
  • J. Boehm
    • 1
  • H. Schuh
    • 1
  • T. Kluegel
    • 2
  • A. Velikoseltsev
    • 3
  • K. U. Schreiber
    • 3
  • A. Brzezinski
    • 4
  1. 1.Institute of Geodesy and Geophysics, Advanced GeodesyVienna University of TechnologyViennaAustria
  2. 2.Bundesamt für Kartographie und GeodäsieGeodätisches Observatorium WettzellBad KötztingGermany
  3. 3.Forschungseinrichtung SatellitengeodäsieTechnische Universität MünchenBad KötztingGermany
  4. 4.Space Research CentrePolish Academy of SciencesWarszawaPoland

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