The Great Aurora of 4 February 1872 observed by Angelo Secchi in Rome

Observation of auroras at low latitudes is an extremely rare event typically associated with major magnetic storms due to intense Earth-directed Coronal Mass Ejections. Since these energetic events represent one of the most important components of space weather their study is of paramount importance to understand the Sun-Earth connection. Due to the rarity of these events, being able to access all available information for the few cases studied is equally important. Especially if we refer to historical periods in which current accurate observations from ground-based instruments or from space were not available. Certainly, among these events we must include the great aurora of February 4, 1872. An event whose effects have been observed in different regions of the Earth. What we could consider today a global event, especially for its effects on the communication systems of the time, such as the transatlantic cable that allowed a connection between the United States and Europe since 1866. In this paper we describe the main results of the observations and studies carried out by Angelo Secchi at the Observatory of the Roman College and described in his Memoria sull’Aurora Elettrica del 4 Febbraio 1872 for the Notes of the Pontifical Academy of new Lincei. This note is extremely modern both in its multi-instrumental approach to the study of these phenomena and in its association between solar-terrestrial connection and technological infrastructures on the Earth. The Secchi's note definitely represents the first example of analysis and study of an event on a global scale, such as the Atlantic cable, affecting the Earth. What we nowadays call an extreme space weather event.

Energy Supply to Buses on a Conductive Electric Road: An Evaluation of Charger Topologies and Electric Road Characteristics

An electric road system (ERS) enables transfer of electric energy to a moving vehicle, making it possible to reduce the capacity—and cost—of the battery and the need for static chargers. A conductive electric road allows for relatively low complexity whilst being able to provide high levels of power. When utilising a conductive electric road, safety precautions must be considered with regard to isolation between the charging supply (the electric road) and the vehicle’s traction voltage system (TVS), since no protective Earth connection can be guaranteed. Isolation can be achieved by separating the two systems galvanically or by double isolating the entire TVS and all equipment connected to it on-board the vehicle. This study used the experimental results from a previous paper to model and evaluate three different electric powertrains/charger topologies, including a novel integrated design fulfilling the required safety features. The models were used in a full vehicle model and further investigated in a city bus scenario in terms of how charging performance, energy consumption and battery ageing are affected by the aforementioned charging topologies and electric road characteristic. We discovered that charging topology has a strong influence on energy consumption, and that electric road characteristics have a strong influence on battery ageing.

Laminar and turbulent plasmoid ejection in a laboratory Parker Spiral current sheet

Quasi-periodic plasmoid formation at the tip of magnetic streamer structures is observed to occur in experiments on the Big Red Ball as well as in simulations of these experiments performed with the extended magnetohydrodynamics code, NIMROD. This plasmoid formation is found to occur on a characteristic time scale dependent on pressure gradients and magnetic curvature in both experiment and simulation. Single mode, or laminar, plasmoids exist when the pressure gradient is modest, but give way to turbulent plasmoid ejection when the system drive is higher, which produces plasmoids of many sizes. However, a critical pressure gradient is also observed, below which plasmoids are never formed. A simple heuristic model of this plasmoid formation process is presented and suggested to be a consequence of a dynamic loss of equilibrium in the high- $\beta$ region of the helmet streamer. This model is capable of explaining the periodicity of plasmoids observed in the experiment and simulations, and produces plasmoid periods of 90 minutes when applied to two-dimensional models of solar streamers with a height of $3R_\odot$ . This is consistent with the location and frequency at which periodic plasma blobs have been observed to form by Large Angle and Spectrometric Coronograph and Sun Earth Connection Coronal and Heliospheric Investigation instruments.

A review of the SCOSTEP’s 5-year scientific program VarSITI—Variability of the Sun and Its Terrestrial Impact

The Sun is a variable active-dynamo star, emitting radiation in all wavelengths and solar-wind plasma to the interplanetary space. The Earth is immersed in this radiation and solar wind, showing various responses in geospace and atmosphere. This Sun–Earth connection variates in time scales from milli-seconds to millennia and beyond. The solar activity, which has a ~11-year periodicity, is gradually declining in recent three solar cycles, suggesting a possibility of a grand minimum in near future. VarSITI—variability of the Sun and its terrestrial impact—was the 5-year program of the scientific committee on solar-terrestrial physics (SCOSTEP) in 2014–2018, focusing on this variability of the Sun and its consequences on the Earth. This paper reviews some background of SCOSTEP and its past programs, achievements of the 5-year VarSITI program, and remaining outstanding questions after VarSITI.

Light symbolism of female mythological images as a spiritual foundation of Japanese and Chinese cultures

This article analyzes female principle reflected in the images of goddesses of Japanese and Chinese mythology associated with the solar cult and light symbolism. An attempt is made to trace the role of female principle in the mythological phenomenon of Sky and its connection with Earth. The subject of this research is the Japanese and Chinese myths and legends, iconographic images of goddesses and their resemblance in foxes (Kitsune) in the religious painting of the XIII – early XX centuries. In the course of this work, the author applies comparative-historical and iconographic methods of research that lean on scientific materials dedicated to philosophy, culturology and art history. The relevance of the selected topic is substantiated by the fact that in globalizing world, the countries of the Far East are more capable of retaining ideological paradigms and preserving their national cultural identity due to traditionalism and spiritual consciousness. The novelty of this work consists in examination based on the iconographic material and mythological themes of solar manifestations of goddesses as demonstration of the energy of female principle and its reflection in the phenomenon of Sky – Earth connection. The conclusion is made that for assessing Japanese and Chinese art, it is essential to consider multicultural interaction of these countries founded on the the harmony of existence of human nature. The goddesses of Sun, Moon and Earth seek to communicate with the Sky, as in particular the autochthonous deity Inari through their intermediaries, the foxes. The sun and moon goddesses and Earth goddesses seek communication with the Sky, as the autochthonous deity Inari through their mediators – foxes. The female principle, resembled in femininity of divine foxes, is described as the endless struggle for immortality and opportunity to be in Heaven surrounded by the steam light and reason. The light saturation of female images contributes to their spirituality.

Earth connection

This study explored direct experiences of women’s relationships with the Earth and how this impacted their lives. Using the transpersonal research methodology of intuitive inquiry, 10 White Western women aged between 36 and 64 were interviewed. Thematic content analysis was used to identify the emerging themes within the data and create descriptive summaries. The research found that connecting to the Earth may help us (a) process difficult emotions and experience more positive ones; (b) stay present and deal with life more effectively; (c) feel in control of changes in our lives; (d) realise that we need to give back to the Earth for what it provides for us; (e) expand our sense of self to include a sense of a divine cycle of life, and; (f) feel part of the Earth as we develop a clearer sense of who we are on an individual level. A definition of Earth connection is proposed: Earth connection is a subjective sense of feeling part of the Earth. It helps an individual to gain a deeper sense of who they are within a divine cycle of life. It also promotes a sense of a reciprocal relationship between an individual and the Earth.