scholarly journals Simultaneous auroral observations described in the historical records of China, Japan and Korea from ancient times to AD 1700

2000 ◽  
Vol 18 (1) ◽  
pp. 1-10 ◽  
Author(s):  
D. M. Willis ◽  
F. R. Stephenson

Abstract. Early auroral observations recorded in various oriental histories are examined in order to search for examples of strictly simultaneous and indisputably independent observations of the aurora borealis from spatially separated sites in East Asia. In the period up to ad 1700, only five examples have been found of two or more oriental auroral observations from separate sites on the same night. These occurred during the nights of ad 1101 January 31, ad 1138 October 6, ad 1363 July 30, ad 1582 March 8 and ad 1653 March 2. The independent historical evidence describing observations of mid-latitude auroral displays at more than one site in East Asia on the same night provides virtually incontrovertible proof that auroral displays actually occurred on these five special occasions. This conclusion is corroborated by the good level of agreement between the detailed auroral descriptions recorded in the different oriental histories, which furnish essentially compatible information on both the colour (or colours) of each auroral display and its approximate position in the sky. In addition, the occurrence of auroral displays in Europe within two days of auroral displays in East Asia, on two (possibly three) out of these five special occasions, suggests that a substantial number of the mid-latitude auroral displays recorded in the oriental histories are associated with intense geomagnetic storms.Key words. Magnetospheric physics (auroral phenomena; storms and substorms)

2018 ◽  
Vol 616 ◽  
pp. A177 ◽  
Author(s):  
Hisashi Hayakawa ◽  
Yusuke Ebihara ◽  
José M. Vaquero ◽  
Kentaro Hattori ◽  
Víctor M. S. Carrasco ◽  
...  

Aims. Historical records provide evidence of extreme magnetic storms with equatorward auroral extensions before the epoch of systematic magnetic observations. One significant magnetic storm occurred on February 15, 1730. We scale this magnetic storm with auroral extension and contextualise it based on contemporary solar activity. Methods. We examined historical records in East Asia and computed the magnetic latitude (MLAT) of observational sites to scale magnetic storms. We also compared them with auroral records in Southern Europe. We examined contemporary sunspot observations to reconstruct detailed solar activity between 1729 and 1731. Results. We show 29 auroral records in East Asian historical documents and 37 sunspot observations. Conclusions. These records show that the auroral displays were visible at least down to 25.8° MLAT throughout East Asia. In comparison with contemporary European records, we show that the boundary of the auroral display closest to the equator surpassed 45.1° MLAT and possibly came down to 31.5° MLAT in its maximum phase, with considerable brightness. Contemporary sunspot records show an active phase in the first half of 1730 during the declining phase of the solar cycle. This magnetic storm was at least as intense as the magnetic storm in 1989, but less intense than the Carrington event.


2019 ◽  
Vol 4 (2) ◽  
pp. 63-65
Author(s):  
Noor aisyah Mokhtar ◽  
Kamarul afizi Kosman

Research Highlights Despite of many historical records from Portuguese about the physical of Melaka Malay City, its existence is still doubtful since there is no clear physical evidence that can be used as basis support to its existence. However, to prove that the city was existed, various physical and scientific evidence are required to prove its existence. Thus, this study aims to identify historical evidence that mentioned its existence which based on the first painting of A’Famosa (Malacca Fort City during Portuguese era). The study proposed three hypothesis and results indicated there is a postivie outcome to prove that the Melaka Malay City existed on and around Bukit Melaka (or St Paul Hill now) based on historical records and sketches found.   Research Objectives This paper attempts to uncover and reveal the historical evidence of Melaka Malay (Fort) City before the city was destroyed and rebuilt according to Portuguese terms. This paper was created to identify the differences between designs and layout plans between the Malacca Malay (Fort) City and the world-renowned Fort A’Famosa, thus comparing the hypothesis arguments about the existence of Melaka City. Indeed, there is a clear distinction between the design, layout, character and philosophy of the Malay and Portuguese cities. The scope focuses only on the site of the physical building (which is believed to be historical evidence) of the city at the Melaka River’s estuary where important and significant buildings during Melaka Malay empire was constructed – the palace, mosque, administration buildings, harbors, and different kind of settlements. There is a great probability of continuing this study into the use of satellite technology in determining and identifying the Melaka Malay City with more precise and accurate details. The implication of this study can be a catalyst for continuous and deeper research on the original site of the Melaka Malay City as to prove the validity of its existences.   Methodology In an effort to discuss the existence of this Melaka Malay City, various aspects and methods were conducted to find the most suitable matches and comparisons that almost accurately describe their design then prove its existence. The remains and plans of Melaka City today since the British era will be the basis of its existence. Hence, the study of historical records and sketches of the Melaka City from the Dutch government and subsequently the Portuguese will be made to seek physical evidence of the earliest design of Melaka City. Later, the historical records of the city from Malay Archipelago, Chinese, Portuguese and Dutch sources will be depicted in city design. As a reinforcement, the philosophy of urban design in the Malay World is highlighted as well as presenting the comparison between the other Malay Kingdoms and the Melaka Malay City.   Results The foundations of the Malay cities basically were designed in square or rectangular shape, no matter how far the city was set up (Abdul Halim Nasir, 1990). This is in line with the philosophy in the Malay world that associated with a simple yet sufficient form of compassion that covers the various aspects of the Malay community's facilities and their living that are synonymous with modular systems (Yusoff Hashim, 2010). The first Fort A'Famosa built by the Portuguese was rectangular (G.W.Irwin, 2006). Its position was below the foot of Bukit Melaka and along the estuary of the Melaka River which is also near the bridge stretching the mouth of the Melaka River (Portuguese Documents of Malacca, 11: 6 de Goes, para 11). The city of A'Famosa in the painting has a relatively six-tower on the corner of the city near the bridge. Whereas city fort or bastion on three other city corners are two-storey building. A’Famosa was built on the site of the Great Mosque of Melaka (Portuguese Documents of Malacca, 11: 6 de Goes, the 25th) which features a rectangular shape as the custom of mosques designs in the Malay Archipelago realm at that time, then the A'Famosa was originally built in rectangular over the ruins (or damage) of the Great Mosque Malacca after the success of Portuguese colonization.   Findings The research showed that the design of Melaka City or A'Famosa City was in square or rectangular shape as it was built on the ruins of the Great Mosque of Melaka. The rectangular fort design was synonym with the design of other Malay forts or cities as it was a fundamental design tradition in the Malay world from fourth century until the later centuries after the collapse of Melaka empire either in Malay clusters. This coincides with the urban philosophy and design of the Malay and Islamic city that breed in the Malay Archipelago region at that time.


2010 ◽  
Vol 6 (1-2 (7)) ◽  
pp. 149-162
Author(s):  
Lusine Sahakyan

The present article examines the methods and stages of the policy of Turkification of the non-Muslim toponyms in the Ottoman Empire and the Republic of Turkey. Being stable linguistic facts, toponyms supply valuable material for topography and studies of dialects, ethnography, history and geography. They also contain important linguistic facts which can confirm the national belonging of a given settlement. Hence, realizing the strategic value of toponyms, the Turkish authorities have changed, distorted and have tried to get hold of the Armenian, Greek, Assyrian, Laz toponyms through translations ascribing them Turkish and at times Kurdish origins. The article contains the translated version of Enver Pasha’s decree on Turkification of toponyms issued on January 5, 1916 – a document which aims to conceal the traces of the Armenian Genocide. The article also examines the political aims of the Turkish authorities to replace the term Western Armenia with Eastern Anatolia as well as the dangerous consequences of the use of this term we could face. The Armenian toponyms that have been around since ancient times do not serve as linguistic evidence only. Rather, they provide unbiased historical evidence that reveals the whole truth of the real native masters of the Armenian Highland. Therefore, the protection, preservation and restoration of the Armenian toponyms is of great strategic significance for us.


Author(s):  
Tim Dyson

This chapter addresses the period from the end of the Mauryan Empire to c.1000 CE. There is very little evidence for the period. Nevertheless, people probably continued to migrate into river valleys and exploit new land. As a result, populations in different parts of the subcontinent increased—albeit usually very slowly and irregularly. In the north, Indo-Aryan influences continued to grow. Further south, kingdoms like those of the Pallavas and Cholas were crucial to the process of ‘Indianization’ which, from about the second century CE, affected areas of south-east Asia. It seems unlikely that India’s people were badly affected by the so-called ‘Plague of Justinian’ which affected parts of the Middle East and southern Europe during the sixth century. The chapter considers evidence collected around 640 CE by the Chinese visitor Hsuan Tsang and suggests that it is consistent with a total population of anywhere between 30 and 85 million.


2020 ◽  
Author(s):  
Minkwang Cho ◽  
Hyun Mee Kim

<p> In this study, surface carbon dioxide (CO<sub>2</sub>) flux was estimated over East Asia using the inverse modeling approach. Two CO<sub>2</sub> mole fraction datasets observed from South Korea (Anmyeon-do (AMY) and Gosan (GSN)), along with ObsPack observation data package, were additionally assimilated in the CarbonTracker system, and the characteristics of the estimated surface CO<sub>2</sub> flux was analyzed over ten years. To see the impact of the inclusion of the two observation datasets in the Korean Peninsula, the other experiment which only assimilated the ObsPack data was conducted and used for comparison.</p><p> The result showed that by including two more datasets in the data assimilation process, the surface CO<sub>2</sub> flux absorption was slightly enhanced in summer and the surface CO<sub>2</sub> flux emission was weakened in late autumn and spring. This characteristic was shown particularly in Eurasian boreal and Eurasian temperate regions. Validation was done using independent observations from surface and aircraft (Comprehensive Observation Network for Trace gases by Airliner; CONTRAIL), and it showed smaller root mean square error (RMSE) values and bigger uncertainty reduction effect with the experiment which additionally assimilated two Korean observation datasets.</p><p> Meanwhile, the estimated biosphere CO<sub>2</sub> flux from the CarbonTracker was compared with Land Use, Land Use Change and Forest (LULUCF) sector CO<sub>2</sub> emission (or absorption) from the national greenhouse gases emission inventory (NIR). In case of South Korea, the observation density (number of observation sites or number of assimilated data on the area of the region) seemed to be related to some statistic parameters between inventory and CarbonTracker result. More results from model-inventory comparison using other data will be presented in the meeting.</p><p> </p><p><strong>Acknowledgements</strong></p><p> This study was supported by the Korea Meteorological Administration Research and Development Program under grant KMI2018-03712 and a National Research Foundation of Korea (NRF) grant funded by the South Korean government (Ministry of Science and ICT) (Grant 2017R1E1A1A03070968). The authors thank Andrew R. Jacobson for providing the CarbonTracker used for this study.</p>


2005 ◽  
Vol 23 (6) ◽  
pp. 2171-2182 ◽  
Author(s):  
G. Rostoker ◽  
E. Friedrich

Abstract. The past four decades have seen a considerable amount of research on the study of magnetospheric substorms, and over most of these years the expansive phase of the substorm has been associated with the development of a three dimensional current system that has been termed the substorm current wedge. This current system has been thought to be a consequence of the short-circuiting of crosstail current through the ionosphere, and is viewed as a distinctive current system operating independently from the directly driven current with which it co-exists. The purpose of this paper is to show that the substorm current wedge should be viewed as an equivalent current system rather than a real current system. It will be shown that the magnetic perturbation pattern associated with the current wedge can be modeled as purely a perturbation of the directly driven current system in the midnight sector. Keywords. Magnetospheric physics (Auroral phenomena; Current systems; Magnetotail; Storms and substorms


1986 ◽  
Vol 19 (2) ◽  
pp. 363-370
Author(s):  
Michael Howlett

AbstractInterpretation of the intentions of government in policy matters is a crucial, if normally implicit, aspect of policy analysis. Canadian policy analysts enjoy a significant advantage in having at their disposal a large body of legal-historical evidence of policy conflict between levels of government, which, if properly interpreted, can aid the process of determining the intentions of government policy. Using an example of conflicting interpretations of government intentions contained in the literature on Canadian political economy, it is argued that the use of legal-historical records can aid policy analysts by providing evidence of policy alternatives not only in the case of policy decisions, or “acts of commission,” but also in the case of nondecisions, or “acts of omission.”


2005 ◽  
Vol 23 (6) ◽  
pp. 2183-2198 ◽  
Author(s):  
V. A. Sergeev ◽  
M. V. Kubyshkina ◽  
W. Baumjohann ◽  
R. Nakamura ◽  
O. Amm ◽  
...  

Abstract. Transition from the growth phase to the substorm expansion during a well-isolated substorm with a strong growth phase is investigated using a unique radial (THEMIS-like) spacecraft constellation near midnight, including the probing of the tail current at ~16 RE with Cluster, of the transition region at ~9 RE with Geotail and Polar, and of the inner region at 6.6 RE with two LANL spacecraft. The activity development on both a global scale and near the spacecraft footpoints was monitored with global auroral images (from the IMAGE spacecraft) and the ground network. Magnetospheric models, tuned using in-situ observations, indicated a strong tail stretching and plasma sheet thinning, which included the growth of the near-Earth current (approaching 30 nA/m2) and possible formation of a local B minimum in the neutral sheet (~5 nT) at ~10–12 RE near the substorm onset. However, there were no indications that the substorm onset was initiated just in this region. We emphasize the rather weak magnetic and plasma flow perturbations observed outside the thinned plasma sheet at Cluster, which could be interpreted as the effects of localized earthward-contracting newly-reconnected plasma tubes produced by the impulsive reconnection in the midtail plasma sheet. In that case the time delays around the distinct substorm onset are consistent with the activity propagation from the midtail to the inner magnetosphere. A peculiar feature of this substorm was that 12min prior to this distinct onset, a clear soft plasma injection to the GEO orbit was recorded which has little associated effects both in the ionosphere and in the transition region at ~9 RE. This pseudo-breakup was probably due to either a localized ballooning-type activity or due to the braking of a very narrow BBF whose signatures were also recorded by Cluster. This event manifested the (previously unknown) phenomenon, a strong tail overloading (excessive storage of magnetic energy) contrasted to the modest energy dissipation and plasma acceleration, which are both discussed and interpreted as the consequences of cold/dense and thick pre-substorm plasma sheet which often occurs after the long quiet period. The lessons of using the radial spacecraft configurations in substorm onset studies are also discussed. Keywords. Magnetospheric physics (Auroral phenomena, plasma sheet, storms and substorms)


Author(s):  
Alejandro M. Gallo

<p><strong>Resumen </strong></p><p>La creencia en cualquier tipo de conspiraciones ha existido desde los tiempos más antiguos; sin embargo, la implantación y desarrollo de las nuevas tecnologías de comunicación de masas las ha convertido en virales. El objeto de este artículo es analizar cómo desde el comienzo del siglo XXI, han traspasado el umbral de lo patológico para convertirse en lógico; es decir, en una forma de interpretar la realidad y la Historia, e incluso, inundado el discurso político. Esto no es inocuo, sino que hay razones para temer esa implantación de las teorías de la conspiración, pues la Historia nos enseña que ese paso de lo patológico a lo lógico, es el mismo que de la paranoia individual al genocidio, al Holocausto.</p><p><strong>Abstract</strong></p><p>Belief in any kind of conspiracy theory has existed since ancient times. However, the introduction and development of new media technology has turned this event viral. The purpose of this article is to analyse how, since the beginning of the twenty first century, conspiracy theories have crossed the threshold of the pathological to become logical by manipulating historical evidence and penetrating the political discourse. This is non-innocuous as history has demonstrated that the implantation of such theories and their evolution from the pathological to the logical parallels the transition from individual paranoia to the Holocaust genocide.</p>


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