Cassini's motions of the Moon and Mercury and possible excitations of free librations

Barkin Y.V. | Ferrandiz J. | Jin S. | Barkin M.Y.

On the basis of conditionally-periodic solutions of Hamiltonian systems at resonance of main frequencies Cassini's motions, their stability, Cassini's angle and periods of free librations of the Moon and Mercury have been recently studied and determined. The generalized formulations of Cassini's laws for the motion of the Moon and Mercury, that are considered as absolutely rigid non-spherical bodies, have been determined. The study of the second approximation equations of the desired quasi-periodic solutions in the case of the Moon allows us to determine the constant components of the first or ...Daha fazlası

Sea level change along the Black Sea coast from satellite altimetry, tide gauge and GPS observations

Avsar N.B. | Jin S. | Kutoglu H. | Gurbuz G.

Sea level change affects human living conditions, particularly ocean coasts. However, sea level change is still unclear along the Black Sea coast due to lack of in-situ measurements and low resolution satellite data. In this paper, sea level change along the Black Sea coast is investigated from joint satellite altimetry, tide gauge (TG) and Global Positioning System (GPS) observations. The linear trend and seasonal components of sea level change are estimated at 8 TG stations (Amasra, Igneada, Trabzon-II, Sinop, Sile, Poti, Tuapse, and Batumi) located along the Black Sea coast, which are compa ...Daha fazlası

Evaluation of regional ionospheric grid model over China from dense GPS observations

Zhao X. | Jin S. | Mekik C. | Feng J.

The current global or regional ionospheric models have been established for monitoring the ionospheric variations. However, the spatial and temporal resolutions are not enough to describe total electron content (TEC) variations in small scales for China. In this paper, a regional ionospheric grid model (RIGM) with high spatial-temporal resolution (0.5° × 0.5° and 10-min interval) in China and surrounding areas is established based on spherical harmonics expansion from dense GPS measurements provided by Crustal Movement Observation Network of China (CMONOC) and the International GNSS Service (I ...Daha fazlası

Evaluation of ocean tide loading effects on GPS-estimated precipitable water vapour in Turkey

Gokhan G. | Jin S.

Global Positioning System (GPS) has been widely used to estimate the total zenith tropospheric delay (ZTD) and precipitable water vapour (PWV) for weather prediction and atmospheric research as a continuous and all-weather technique. However, estimations of ZTD and PWV are subject to effects of geophysical models with large uncertainties, particularly imprecise ocean tide models of inland seas in Turkey. In this paper, GPS data from Jan. 1, 2010 to Dec. 31, 2011 are processed using GAMIT/GLOBK at four co-located GPS stations (ISTN, ERZR, SAMN, and IZMI) with Radiosonde from the Turkish Met-Off ...Daha fazlası

Sea level change along the Black Sea coast from satellite altimetry tide gauge and GPS observations

AVŞAR NEVİN BETÜL,JIN SHUANGGEN,KUTOĞLU ŞENOL HAKAN,GÜRBÜZ GÖKHAN

Evaluation of ocean tide loading effects on GPS estimated precipitable water vapour in Turkey

GÜRBÜZ GÖKHAN,JIN SHUANGGEN