Sentences with phrase «for ionospheric»

The development of a new ionospheric foF2 forecasting algorithm, called the Solar Wind driven autoregression model for Ionospheric short - term Forecast (SWIF), was recently introduced (Tsagouri et al. 2009).

However, we believe that the results obtained indicate that DIAS effective sunspot number can provide a reliable estimator of the average ionospheric disturbance level over a substantial part of Europe and a powerful tool for ionospheric specification applications.

In Section 4.2, Tsagouri et al. (2009) developed a new ionospheric forecasting algorithm, called the Solar Wind driven autoregression model for Ionospheric short - term Forecast (SWIF).

Not exact matches

Two of the outdoor experiments on the HTV's first flight are a NASA ionospheric and thermospheric mapping device, and a JAXA system for monitoring the ozone layer's chemistry.

CARL SAGAN and FRANK DRAKE are professors of astronomy at Cornell University, where Sagan is director of the Laboratory for Planetary Studies and Drake is director of the National Astronomy and Ionospheric Center.

Ionospheric photoelectrons can be used as an important diagnostic tool for the topology of the solar wind interaction with both magnetized and unmagnetized objects (Coates et al. 2011), possibly playing a role also in enhancing the ion escape.

These ionospheric trends accelerated after 1980, providing support for their anthropogenic origin.

Longitudinal structure in the CHAMP electron densities and their implications for global ionospheric modeling

It is triggered by an alert signal for upcoming ionospheric disturbances obtained from the online analysis of the IMF's observations obtained from ACE spacecraft.

The most important feature of the cross-correlation analysis is that for all months the ionospheric response is composed by two phases, positive and negative, with different duration and different time delay.

Bremer et al. (2009) summarized various results on geomagnetic activity control of trends in the ionosphere and found that the change of dependence of trends on long - term change of geomagnetic activity, i.e., the loss of dominant geomagnetic activity control of ionospheric trends, occurred around 1970 in the E region, in the early 1990s in the F1 region, and around 2000 in the F2 region as illustrated in Figure 5 for two European stations Roma and Slough / Chilton.

Limitations are imposed for small - scale effects, such as positive effects of short duration observed locally indicating ΔR12eff responses to the averaged ionospheric activity over Europe.

Based on this, SWIF is able to provide alerts and warnings for upcoming ionospheric storm - time disturbances as well as ionospheric forecasts up to 24 h ahead under all possible conditions.

Section 4.3 describes a model which combines two models developed for different ionospheric conditions.

Empirical models using solar wind parameters and / or IMF as drivers, usually, are used for now - casting (specification of ionospheric state) or forecasting 1 — 3 h ahead.

The effective sunspot number — R12eff is used in DIAS (European Digital Upper Atmosphere Server) as a proxy of the ionospheric conditions over Europe for regional ionospheric mapping purposes (Zolesi et al. 2004; Tsagouri et al. 2005).

During disturbed ionospheric storm conditions considerable improvement (greater than 10 %) over climatology and persistence is gained for all prediction steps and at all latitudes.

In general, the error tends to be higher for higher prediction steps, higher latitudes, and higher ionospheric activity levels.

In addition, as a clear advance for radio science purposes, it should be noted that SWIF provides an alternative approach to ionospheric forecasting issue, using solar wind parameters as a proxy of the ionospheric activity level.

The long time series of ionospheric data were of crucial importance for climate change studies.

For application purposes, however, empirical modeling of ionospheric parameters has been found most suitable and accurate.

Future developments may include a more sophisticated method for its derivation in order to anticipate localized ionospheric effects and the quantitative description of its relation to the intensity of ionospheric activity.

DIAS (European Digital Upper Atmosphere Server) effective sunspot number — R12eff was introduced as a proxy of the ionospheric conditions over Europe for regional ionospheric mapping purposes (Zolesi et al. 2004; Tsagouri et al. 2005).

During disturbed conditions, it is still relatively small (10 — 13 %) for predictions provided 1 h ahead and may reach 20 % and 30 % at middle - to - low and middle - to - high latitudes, respectively, for high ionospheric activity level and predictions provided 24 h ahead.

SWIF is currently implemented online in DIAS system to provide ionospheric forecasts up to 24 h ahead as well as alerts and warnings for the European region (http://dias.space.noa.gr).

Empirical ionospheric models are most suitable for application - oriented research and operational services, like ionospheric forecasting.

The factors causing an anomalous wear of Russian pipeline systems are also analyzed, and the methods for reducing their rapid corrosion through taking into account the influence of heliogeomagnetic and ionospheric disturbances are described.