Characteristics of Perturbations in Recent Length of Day and Polar Motion
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 coor...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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The Korean Space Science Society
2013-03-01
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| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2013/v30n1/OJOOBS_2013_v30n1_33.pdf |
| _version_ | 1797333040819601408 |
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| author | Sung-Ho Na Younghee Kwak Jung-Ho Cho Sung-Moon Yoo Sungki Cho |
| author_facet | Sung-Ho Na Younghee Kwak Jung-Ho Cho Sung-Moon Yoo Sungki Cho |
| author_sort | Sung-Ho Na |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-08T07:58:06Z |
| format | Article |
| id | doaj.art-cf10dcfd2e5745498e503f4ab60c3052 |
| institution | Directory Open Access Journal |
| issn | 2093-5587 2093-1409 |
| language | English |
| last_indexed | 2024-03-08T07:58:06Z |
| publishDate | 2013-03-01 |
| publisher | The Korean Space Science Society |
| record_format | Article |
| series | Journal of Astronomy and Space Sciences |
| spelling | doaj.art-cf10dcfd2e5745498e503f4ab60c30522024-02-02T13:09:39ZengThe Korean Space Science SocietyJournal of Astronomy and Space Sciences2093-55872093-14092013-03-01301334110.5140/JASS.2013.30.1.033Characteristics of Perturbations in Recent Length of Day and Polar MotionSung-Ho Na0Younghee Kwak1Jung-Ho Cho2Sung-Moon Yoo3Sungki Cho4Korea Astronomy and Space Science Institute, Daejeon 305-348, KoreaKorea Astronomy and Space Science Institute, Daejeon 305-348, KoreaKorea Astronomy and Space Science Institute, Daejeon 305-348, KoreaKorea Astronomy and Space Science Institute, Daejeon 305-348, KoreaKorea Astronomy and Space Science Institute, Daejeon 305-348, KoreaVarious 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.http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2013/v30n1/OJOOBS_2013_v30n1_33.pdflength of daypolar motion |
| spellingShingle | Sung-Ho Na Younghee Kwak Jung-Ho Cho Sung-Moon Yoo Sungki Cho Characteristics of Perturbations in Recent Length of Day and Polar Motion Journal of Astronomy and Space Sciences length of day polar motion |
| title | Characteristics of Perturbations in Recent Length of Day and Polar Motion |
| title_full | Characteristics of Perturbations in Recent Length of Day and Polar Motion |
| title_fullStr | Characteristics of Perturbations in Recent Length of Day and Polar Motion |
| title_full_unstemmed | Characteristics of Perturbations in Recent Length of Day and Polar Motion |
| title_short | Characteristics of Perturbations in Recent Length of Day and Polar Motion |
| title_sort | characteristics of perturbations in recent length of day and polar motion |
| topic | length of day polar motion |
| url | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2013/v30n1/OJOOBS_2013_v30n1_33.pdf |
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