In this paper we analyze in detail some aspects of the proposed use of Ajisai and Jason-1, together with the LAGEOS satellites, in order to measure the general relativistic Lense-Thirring effect in the gravitational field of the Earth. A suitably designed linear combination of the nodes of such satellites which cancels out, by construction, the first three even zonal harmonics of the Newtonian ...

Recent tests aimed at the detection of the general relativistic gravitomagnetic Lense-Thirring effect in the gravitational field of the Earth with the LAGEOS and LAGEOS II satellites have proved to be affected, among other things, by the corrupting impact of the secular variations J̇4 and J̇6 of the second and third even zonal harmonic coefficients of the multipolar expansion of the terrestrial g...

The neural network-based nonlinear singular spectrum analysis (NLSSA) is applied to the zonal winds in the 70-10 hPa region (roughly 20-30 km altitude) measured at near-equatorial stations during 1956-2000. The data are pre-filtered by the linear singular spectrum analysis (SSA), with the leading 8 SSA principal components (PCs) used as inputs for the NLSSA. The NLSSA fits a curve to the data i...

In this brief note some comments about the observable used in a recently published paper on the measurement of the general relativistic Lense-Thirring in the gravitational field of the Earth are presented. It turns out that, among other things, the authors might have yielded an optimistic evaluation of the error budget because of an underestimation of the impact of the secular variations of the...

We quantitatively discuss the impact of the current uncertainties in the even zonal harmonic coefficients Jl of the Newtonian part of the terrestrial gravitational potential on the measurement of the general relativistic Thirring-Lense effect using a suitable linear combination of the nodes Ω of the laser-ranged LAGEOS and LAGEOS II satellites. The 1-sigma systematic error due to the mismodelli...

Interaction among potential vorticity perturbations and propagating internal gravity waves in a horizontally sheared zonal flow is investigated. In the strong stratification limit, an initial vorticity perturbation weakly excites two propagating gravity waves while the density component of the potential vorticity perturbation is significantly amplified, potentially leading to convective collaps...

Numerical experiments with a 2.5-layer and a 2-level model are conducted to examine the mechanism for the planetary scale selection of the Madden–Julian oscillation (MJO). The strategy here is to examine the evolution of an initial perturbation that has a form of the equatorial Kelvin wave at zonal wavenumbers of 1 to 15. In the presence of a frictional boundary layer, the most unstable mode pr...

In this paper we quantitatively discuss the impact of the current uncertainties in the even zonal harmonic coefficients Jl of the Newtonian part of the terrestrial gravitational potential on the measurement of the general relativistic Lense-Thirring effect using a suitable linear combination of the nodes Ω of the laser-ranged LAGEOS and LAGEOS II satellites. The 1-sigma systematic error due to ...

A critical analysis of a recent test of the Lense-Thirring effect with the LAGEOS satellites Abstract We quantitatively discuss the impact of the current uncertainties in the even zonal harmonic coefficients J ℓ of the Newtonian part of the terrestrial gravitational potential on the measurement of the general relativistic Lense-Thirring effect using a suitable linear combination of the nodes Ω ...