[1] A middleand low-latitude ionospheric theoretical model is used for the first time to assess the effects of the secular variations of geomagnetic field orientation on ionospheric long-term trends over the past century. It is found that the varied geomagnetic field can produce ionospheric long-term trends in both foF2 and hmF2. Since the amplitudes of geomagnetic field change depend on locati...

A logistic regression model is implemented for predicting the occurrence of intense/super-intense geomagnetic storms. A binary dependent variable, indicating the occurrence of intense/super-intense geomagnetic storms, is regressed against a series of independent model variables that define a number of solar and interplanetary properties of geo-effective CMEs. The model parameters (regression co...

It has been shown that the optimal linear prediction lter relating the solar wind electric eld and the geomagnetic activity, as measured by the AL index, is both bi-modal and dependent on the level of activity in the magnetosphere. Further studies truncated the prediction lter to a ve parameter model containing two low-pass ltered delta functions of arbitrary amplitude and delay time. The prese...

Scaling in long term data sets of geomagnetic indices and solar wind ǫ as seen by WIND spacecraft. We study scaling in fluctuations of the geomagnetic indices (AE, AU , and AL) that provide a measure of magnetospheric activity and of the ǫ parameter which is a measure of the solar wind driver. Generalized structure function (GSF) analysis shows that fluctuations exhibit self-similar scaling up ...

Vertical rigidities of geomagnetic cutoff are obtained for world neutron monitor network with annual resolution for the period of 1950-2020 by the method of trajectory calculations with the model International Geomagnetic Reference Field. Results of the computations show the total decrease of the cut off rigidities in the majority points which is caused by a decrease of the total geomagnetic fi...

Abstract. Seasonal features of geomagnetic activity and their solar-wind–interplanetary drivers are studied using more than five solar cycles wind observations. This study involves a total 1296 storms varying intensity identified the Dst index from January 1963 to December 2019, 75 863 substorms SuperMAG AL/SML 1976 2019 145 high-intensity long-duration continuous auroral electrojet (AE) (HILDC...

Statistic analyses demonstrate that the probability of earthquake occurrence in many earthquake regions strongly depends on the time of day, that is on Local Time (e.g. Conrad, 1909, 1932; Shimshoni, 1971; Duma, 1997; Duma and Vilardo, 1998). This also applies to strong earthquake activity. Moreover, recent observations reveal an involvement of the regular diurnal variations of the Earth’s magn...

The characterization of global energy storage and release in the coupled solar wind-magnetosphere system remains one of the fundamental problems of space physics. Recently, it has been realised that a new paradigm in physics, that of Self Organised Criticality (SOC) may encapsulate the mixing and merging of flux on many scales in the magnetotail prompting bursty energy release and reconfigurati...