搜索结果: 1-15 共查到“地球物理学 K index”相关记录15条 . 查询时间(0.14 秒)
On the derivation of an hourly local index to define the normal ionosphere
reference ionosphere ionospheric disturbance ionospheric indices
2015/9/30
In this paper an hourly local ionospheric index f n F 2 is proposed to define the normal level of the undisturbed
ionosphere. For the determination of this index a model is developed where the normal...
The analysis of the Standardized Precipitation Index in the Mediterranean area:large-scale patterns
Climate variability drought monitoring
2015/9/28
Problems related to the identification and monitoring of drought are investigated. In particular, drought conditions in Italy are examined using the Standardized Precipitation Index (SPI) on different...
The analysis of the Standardized Precipitation Index in the Mediterranean area:regional patterns
Rainfall observatory drought climate variability
2015/9/28
In the present paper we propose a method to assess regional drought by using rain-gauge observations. In particular, we analyse the rainfall on the Marche region. We diagnose drought by means of the S...
Retrieving leaf area index from multi-angular airborne data
LAI inversion POLDER HyMap multi-angular
2015/9/7
This work is aimed to demonstrate the feasibility of a methodology for retrieving bio-geophysical variables whilst at the same time fully accounting for additional information on directional anisotrop...
K-type geomagnetic index nowcast with data quality control
geomagnetic activity index real-time computing nowcast system
2015/8/27
A nowcast system for operational estimation of a proxy K-type geomagnetic index is presented. The system is based on a fully automated computer procedure for real-time digital magnetogram data acquisi...
Nonlinear analysis of magnetospheric data Part II. Dynamical characteristics of the AE index time series and comparison with nonlinear surrogate data
Nonlinear analysis magnetospheric data Dynamical characteristics AE index time series
2009/11/13
In this study we have used dynamical characteristies such as Lyapunov exponents, nonlinear dynamic models and mutual information for the nonlinear analysis of the magnetospheric AE index time series. ...
Nonlinear analysis of magnetospheric data Part I. Geometric characteristics of the AE index time series and comparison with nonlinear surrogate data
Nonlinear analysis magnetospheric data Geometric characteristics AE index time series
2009/11/13
A long AE index time series is used as a crucial magnetospheric quantity in order to study the underlying dynainics. For this purpose we utilize methods of nonlinear and chaotic analysis of time serie...
SVD analysis of the magnetospheric AE index time series and comparison with low-dimensional chaotic dynamics
SVD analysis magnetospheric AE index time series low-dimensional chaotic dynamics
2009/11/12
The singular value decomposition (SVD) analysis is used at different stages in this paper in order to extract useful information concerning the underlying dynamics of the magnetospheric AE index. As a...
Fractal time statistics of AE-index burst waiting times:evidence of metastability
Fractal time statistics AE-index burst waiting times evidence of metastability
2009/11/12
Recent observations and analyses evidenced that the magnetotail, as well as the magnetospheric dynamics are characterised by a scale-free behaviour and intermittence. These results, along with numeric...
Analysis of the geomagnetic activity of the Dst index and self-affine fractals using wavelet transforms
geomagnetic activity Dst index self-affine fractals wavelet transforms
2009/11/11
The geomagnetic activity of the Dst index is analyzed using wavelet transforms and it is shown that the Dst index possesses properties associated with self-affine fractals. For example, the power spec...
Prediction of magnetic storm events using the Dst index
Prediction magnetic storm events Dst index
2009/11/11
This paper provides a method to predict magnetic storm events based on the time series of the Dst index over the period 1981-2002. This method is based on the multiple scaling of the measure represent...
Quasi-biennial oscillations extracted from the monthly NAO index and temperature records are phase-synchronized
Quasi-biennial oscillations monthly NAO index temperature records
2009/11/9
Using the extension of Monte Carlo Singular System Analysis (MC SSA), based on evaluating and testing the regularity of the dynamics of the SSA modes against the colored noise null hypothesis, we demo...
Spectral Studies of Time Series of the aa Index.
The Date of Break-Up of Lake Ice as a Climatic Index
Date Break-Up Lake Ice Climatic Index
2009/6/15
The Date of Break-Up of Lake Ice as a Climatic Index.
Prediction of the Geomagnetic K Index Based on its Previous Value
geomagnetic forecasting geomagnetic variations K index
2009/6/9
The statistical behaviour of the geomagnetic K index is studied at two observatories in Finland:Nurmijärvi in the subauroral region and Sodankylä near the auroral region. Using data of 1953–...