Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
권호 표지
DOI QR코드

DOI QR Code

Characteristics of Perturbations in Recent Length of Day and Polar Motion

  • Received : 2013.01.04
  • Accepted : 2013.01.24
  • Published : 2013.03.15
Download PDF
⟨ Previous Next ⟩

Abstract

Various features of the existing perturbations in the Earth's spin rotation are investigated for the recent and most reliable data by spectral analysis, filtering, and comparison with idealized model. First, theory of Earth's spin rotational perturbation is briefly re-derived in the Earth-fixed coordinate frame. By spectral windowings, different periodic components of the length of day perturbation are separated, and their characters and excitations are discussed. Different periodic components of polar motion are acquired similarly and described with further discussion of their excitations. Causes of the long time trends of both the length of day and polar motion are discussed. Three possible causes are considered for the newly discovered 490-day period component in the polar motion.

Keywords

References

  1. Cerveira PJM, Weber R, Schuh H, The instantaneous Earth Rotation - still inaccessible?, Verm & Geoinfo, 2, 113-120 (2007).
  2. Dehant V, Legros H, Hinderer J, Lefftz M, An analytical approach to the computation of the Earth, the outer core and inner core rotational motion, PEPI, 76, 259-282 (1993).
  3. Gross RS, Earth Rotation Variations -Long Period. In: Herring T. (ed.) Geodesy, Treatise on Geophysics vol. 3 (Elsevier, Amsterdam, 2009), 239-294.
  4. Hopfner J, Low-Frequency Variation, Chander and Annual Wobbles of Polar Motion as observed over one century, Sur Geophys, 25, 1-54 (2004). https://doi.org/10.1023/B:GEOP.0000015345.88410.36
  5. McCarthy DD, Seidelmann PK, TIME from Earth Rotation to Atomic Physics (Wiley-VCH, Weinheim, 2009), 1-94.
  6. Merriam JB, Tidal Terms in Universal Time: Effects of Zonal Winds and Mantle Q, JGR, 89, B12, 10109-10114 (1984). https://doi.org/10.1029/JB089iB12p10109
  7. Na S, Cho J, Baek J, Kwak Y, Yoo S, Spectral Analysis on Earth's Spin Rotation for the Recent 30 years, JKPS, 61, 152-157 (2012). http://dx.doi.org/10.3938/jkps.61.152
  8. Petit G, Luzum B (eds), IERS Conventions 2010, International Earth Rotation and Reference Systems Service Technical Note No. 36 (2010).
  9. Richardson JD, Paularena KI, Belcher JW, Lazarus AJ, Solar wind oscillations with 1.3 year period, GRL, 21, 1559-1560 (1994). http://dx.doi.org/10.1029/94GL01076
  10. Rochester MG, Crossley DJ, Earth's long-period wobbles: a Lagrangian description of the Liouville equations, GJI, 176, 40-62 (2009). http://dx.doi.org/10.1111/j.1365-246X.2008.03991.x
  11. Schreiber KU, Klugel T, Wells JPR, Hurst RB, Gebauer A, How to detect the Chandler and the Annual wobble of the Earth with a Large Ring Laser Gyroscope, PRL, 107,173904 (2011). http://dx.doi.org/10.1103/PhysRevLett.107.173904
  12. Silverman SM, Shapiro R, Power Spectral Analysis of Auroral Occurrence Frequency, JGR, 88, A8, 6310-6316 (1983). https://doi.org/10.1029/JA088iA08p06310
  13. Smith ML, Dahlen FA, The period and Q of the Chandler wobble, GJRaS, 64, 223-281 (1981). http://dx.doi.org/10.1111/j.1365-246X.1981.tb02667.x
  14. Strestik J, Variations in solar and geomagnetic activity with periods near to 1.3 year, Cent Eur J Geo, 2009-1(2), 152-156 (2009). http://dx.doi.org/10.2478/v10085-009-0010-y
  15. Wahr J, Polar Motion Models: Angular Momentum Approach. In: Plag HP, Chao B, Gross R, van Dam T (eds) Forcing of Polar Motion in the Chandler Frequency Band: a Contribution to Understanding Interannual Climate Variation: proceedings, 21-23 April 2004 (European Center for Geodynamics and Seismology, Luxemburg, 2005), 1-7.
  16. Wallace PT, Capitaine N, Precession-nutation procedures consistent with IAU 2006 resolutions, A&A, 459, 981-985 (2006). http://dx.doi.org/10.1051/0004-6361:20031539

Cited by

  1. Deformation in the elastic and spherically-symmetric earth due to circular cap load vol.64, pp.7, 2014, https://doi.org/10.3938/jkps.64.1078
  2. Changes in the Earth's Spin Rotation due to the Atmospheric Effects and Reduction in Glaciers vol.33, pp.4, 2016, https://doi.org/10.5140/JASS.2016.33.4.295