dorsal/arxiv
View SchemaA New Free Core Nutation Model with Variable Amplitude and Period
| Authors | Zinovy Malkin |
|---|---|
| Categories | |
| ArXiv ID | physics/0407153 |
| URL | https://arxiv.org/abs/physics/0407153 |
| Journal | In: IVS 2004 General Meeting Proc., Eds. N. R. Vandenberg, K. D. Baver, NASA/CP-2004-212255, 2004, 388-392 |
Abstract
Three most long and dense VLBI nutation series obtained at the Goddard Space Flight Center, Institute of Applied Astronomy, and U.S. Naval Observatory were used for investigation of the Free Core Nutation (FCN) contribution to the celestial pole offset. Some recent studies have showed that the FCN period or/and phase does not remain constant, but varies in a rather wide range of about 410--490 days (for equivalent period). To implement this result in the practice, a new FCN model with variable amplitude and period (phase) is developed. Comparison of this model with observations shows better agreement than existing one. After correction of the differences between observed VLBI nutation series and the IAU2000A model, they decreased to a level about 100 microarcseconds.
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"abstract": "Three most long and dense VLBI nutation series obtained at the Goddard Space\nFlight Center, Institute of Applied Astronomy, and U.S. Naval Observatory were\nused for investigation of the Free Core Nutation (FCN) contribution to the\ncelestial pole offset. Some recent studies have showed that the FCN period\nor/and phase does not remain constant, but varies in a rather wide range of\nabout 410--490 days (for equivalent period). To implement this result in the\npractice, a new FCN model with variable amplitude and period (phase) is\ndeveloped. Comparison of this model with observations shows better agreement\nthan existing one. After correction of the differences between observed VLBI\nnutation series and the IAU2000A model, they decreased to a level about 100\nmicroarcseconds.",
"arxiv_id": "physics/0407153",
"authors": [
"Zinovy Malkin"
],
"categories": [
"physics.geo-ph"
],
"journal_ref": "In: IVS 2004 General Meeting Proc., Eds. N. R. Vandenberg, K. D.\n Baver, NASA/CP-2004-212255, 2004, 388-392",
"title": "A New Free Core Nutation Model with Variable Amplitude and Period",
"url": "https://arxiv.org/abs/physics/0407153"
},
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