Electric fields and currents in the equatorial electrojet deduced from VHF radar observations—I. A method of estimating electric fields

Using the measured Doppler spectra of the VHF backscatter radar signals from type II ionization irregularities in the equatorial electrojet (EEJ) at Thumba (dip. 56′S), the height profiles of the phase velocity V_p of the plasma waves in the EEJ are determined. It is shown that the east-west electrostatic field E_y in the EEJ can be deduced from the experimental height profiles of V_p using an appropriate model of ion and electron collision frequencies. The theoretical basis and the practical application of the method for deducing E_y are described. The usefulness of the method even when type I irregularities are present at the higher altitudes of the EEJ is demonstrated.It is shown that the collision frequencies of ions and electrons are likely to have a significant diurnal variation, which may be caused by diurnal variations of the neutral densities and temperatures in the E-region.     

Electric fields and currents in the equatorial electrojet deduced from VHF radar observations—II. Characteristics of electric fields on quiet and disturbed days

Using the Doppler spectra of VHF radar signals, the height profiles of the phase velocity (V_p) of 2.7 m irregularities in the equatorial electrojet (EEJ) over Thumba (dip: 56′S) are obtained. The day-time east-west electric fields (E_y) are deduced by matching experimentally observed V_p profiles with theoretically deduced ones for a number of quiet and disturbed days. The experimental E_y values show: (i) a large day-to-day variability; (ii) a large decrease in the afternoon hours on some days (quiet and disturbed); (iii) the frequent presence of short period fluctuations with amplitudes of 30–50% of the background value and with typical time scales of 30–60 min, on moderately disturbed days (9 ⩽ A_p ⩽ 30); (iv) a significant decrease of the average E_y on disturbed days compared to that on quiet days during 0900–1200 h L.T.     

Lightning transient fields in the atmosphere—low ionosphere

The complexity of the electric properties of the atmosphere, which influences the excitation and propagation of electromagnetic signals generated by lightning discharges, gives rise to a diversity of the typical signal wave forms and amplitudes in the various space-time domains. This causes difficulties and controversies in the interpretation of the experimental data. In geophysical problems of such a kind, considerations accounting for a broadband spectrum are particularly important.In the present paper, lightning induced ULF-VLF fields in the daytime inhomogeneous atmosphere and D-region of the ionosphere above the thundercloud are analyzed for a standard model of the vertical return stroke. The developed analytical approach makes it possible to unite the canonical model of the electromagnetic radiation into a free-half-space, the discharge (ELF-VLF spectrum) and ‘post-discharge’ (ULF spectrum) low-frequency models and to clarify the temporal scales in the mechanism of lightning coupling with the atmosphere and low ionosphere with respect to the local relaxation time, discharge characteristic time scales and observer location.     

Plasmaspheric zonal electric fields and coupling fluxes from the Dunedin VLF Doppler experiment,for 180°E,L ≈ 2.3, at solstice and equinox

Group delays and Doppler shifts from ducted whistler-mode signals are measured using the VLF Doppler experiment at Dunedin, New Zealand (45.8°S, 170.5°E). Equatorial zonal electric field and plasmasphere-ionosphere coupling fluxes are determined for L ≈ 2.3 at June solstice and equinox during magnetically quiet periods. The general features of the electric field measured at Dunedin agree with those predicted from ionospheric dynamo theory with a (1,−2) tidal component. Some seasonal variations are observed, with the electric field measured during equinox being smaller and predominantly westward during the night. The electric field at June solstice is also westward during the evening and for part of the night, but turns sharply eastward during the pre-dawn and dawn period at the duct entry site. The June electric field appears to follow a diurnal variation whereas the equinox electric field shows a possible 4-hourly periodic variation. Seasonal variations in the neutral wind pattern, altering the configuration of the ionospheric dynamo field, are the probable cause of the seasonal differences in the electric field. The seasonal variation of the coupling fluxes can be explained by the alteration of the E x B drift pattern, caused by the changes in the electric field.     

Back from modernity?

Steve Bruce, The Rise and Fall of the New Christian Right: Conservative Protestant Politics in America 1978–1988, Clarendon Press, Oxford, 1988, pp.224. £19.50(cloth).

Mark Silk, Spiritual Politics: Religion and America Since World War Two, Simon and Schuster, New York, 1988, pp.206. $US19.95(cloth).

Robert Wuthnow, The Restructuring of American Religion: Society and Faith Since World War Two, Princeton University Press, Princeton, 1988, pp.374. $US25(cloth).

This review article discusses three recently released works which deal with the relationship between religion and politics in modern America. It places these works in the context of the rise of the New Christian Right and of the related intellectual debate over the relevance of secularisation theories to contemporary America. After considering the various arguments raised in these works, the article concludes by suggesting that although there is some evidence of increasing secularisation in the American public sphere since 1945, the continuing strength of private religious beliefs indicates that religious groups will continue to impact upon American politics into the foreseeable future.     

Domesticating online games for preteens – discursive fields,everyday gaming,and family life

This article examines families’ everyday practices connected with online games played by children ages seven to eleven in the USA. Based on interviews in homes with children and parents, the article employs domestication theory to account for social experiences and symbolic meanings of games and game devices within private and public contexts of children’s game play. The analysis focuses on the social process through which online games are brought into home environments and incorporated into families’ daily routines. Games are analyzed as both impacting on everyday practices of the family and being shaped by the histories, values, and relationships within the households. The article contributes to an understanding of preteens’ online gaming and highlights the strength of using domestication theory to investigate children’s media practices.     

‘Fashioned from Nature’

Abstract

This paper examines the situation of the male draper in terms of his relationships to textiles and female customers between the 1870s and the outbreak of the First World War. Drawing on accounts of shop work produced by men employed as drapers and drapers’ assistants, the essay highlights the ridicule levelled against men who sold textiles, their work with fabrics and clothing, as well as the service they provided for an almost exclusively female clientele, being widely derided as unsuitable labour for a man. Analysing three first-hand accounts of the draper’s lot — H. G. Wells’s discussion of his years as a draper’s apprentice in his Experiment in Autobiography (1934); William Paine’s Shop Slavery and Emancipation (1912), based on the injustices experienced by drapers’ assistants; and the diary of a Bond Street draper, Charles Cavers, posthumously published as Hades! The Ladies! Being Extracts from the Diary of a Draper (1933) — the essay shows how social constructions of masculinity framed the draper’s work, particularly the handling of fabrics.     

Foucault, fields of governability, and the population–family–economy nexus in China

It was only in the early twentieth century that China discovered that it had a population, at least if a population is understood not as a simple number of people but instead in terms of such features as variable levels of health, birth and death rates, age, sex, dependency ratios, and so on—as an object with a distinct rationality and intrinsic dynamics that can be made the target of a specific kind of direct intervention. In 1900, such a developmentalist conception of the population simply did not exist in China; by the 1930s, it pervaded the entire social and political field from top to bottom. Through a reading of a series of foundational texts in population and family reformism in China, this paper argues that this birth of the Chinese population occurred as a result of a general transformation of practices of governing, one that necessarily also involved a reconceptualization of the family and a new logic of overall social rationalization; in short, the isolation of a population–family–economy nexus as a central field of modern governing. This process is captured by elaborating and extending Foucault's studies of the historical emergence of apparatuses (dispositifs) into a notion of fields of governability. Finally, this paper argues that the one-child policy, launched in the late 1970s, should be understood not in isolation from the imposition of the “family-responsibility system” in agriculture and market reforms in exactly that period, but as part—mutatis mutandis—of a return to a form of governing that was developed in the first half of the twentieth century.     

Folktales from the Ægean.

AVEST AFRICAN FOLK-TALES, collected and arranged by W. H. BARKER, B. Sc., and CECILIA SINCLAIR. London: George G. Harrap &; Co. 1917. Reviewed by E. Sidney Hartland.

OBSERVATIONS ON THE MUSSULMAUNS OF INDIA, DESCRIPTIVE, OF THEIR MANNERS, CUSTOMS, HABITS, AND RELIGIOUS OPINIONS, MADE DURING A TWELVE YEARS' RESIDENCE IN THEIR IMMEDIATE SOCIETY. By Mrs. MEER HASSAN ALI. Second Edition, Edited with Notes and an Introduction by W. CROOKE, late of the Indian Civil Service. Oxford University Press, 1917. Pp. xxviii + 442. Price 6s. net or on India paper, 7s. 6d. Reviewed by Vincent A. Smith.     

The oldest evidence of painted furniture from Sweden – The 12th century chair from Suntak

The 12th century Suntak chair is one of the earliest pieces of furniture known from Sweden. A close examination revealed minute remnants of possible colour pigments on several parts of the chair. Chemical analyses of the pigments revealed the presence of several colours such as black, white and red. This paper attempts to shed light upon the identification and origin of the pigments as well as the time of painting. The original use and the setting of the chair will also be discussed.     

Late Triassic palynoflora from the Pranhita–Godavari Valley,India: evidence from vertebrate coprolites

Vijaya, Prasad, G.V.R. & Singh, K., June, 2009. Late Triassic palynoflora from the Pranhita–Godavari Valley, India: evidence from vertebrate coprolites. Alcheringa 33, 91–111. ISSN 0311-5518.

The Upper Triassic Maleri Formation, represented by red clays and sandstones, has to date not produced any plant macrofossils or palynomorphs. Many spiral and non-spiral coprolites collected during this study from the Maleri Formation of the Pranhita-Godavari Valley were analysed for palynomorphs. Based on shape, nature of coiling and size, the Maleri coprolites are classified into seven groups. Of these, only Group-I, Type 5 (non-spiral) and amphipolar (spiral) types yielded diverse gymnospermous and pteridophytic spores, pollen, other plant debris and sparse fungal spores and algal remains. Occurrences of Antulsporites varigranulatus, Aratrisporites spp., Cadargasporites baculatus, Dubrajisporites isolatus, Enzonalasporites vigens, Foraminisporis coelatus, Grandispora spinosa, Kraeuselisporites saeptatus, Polycingulatisporites reduncus, Staurosaccites spp., Tethysispora unica and Tikisporites balmei confirm a Late Triassic age for the coprolite-bearing red clays. Records of Classopollis classoides and Callialasporites turbatus/dampieri in these assemblages more precisely suggest a Norian to Rhaetian age. The non-spiral coprolites were possibly produced by aquatic piscivorous animals whereas the spiral coprolites may have been produced by an as yet unidentified fish taxon. The coprolite-producing animals (spiral and non-spiral groups) possibly ingested gymnospermous and pteridophytic plant remains passively along with water or their herbivorous prey.     

Raised fields in the Bolivian Amazonia: a prehistoric green revolution or a flood risk mitigation strategy?

The Llanos de Moxos (LM), Beni, Bolivia, with its impressive number of pre-Columbian earthworks, is an ideal region for studying past human–environment interactions in the Amazonia. Agricultural raised fields are among the most striking of those earthworks. They can offer us valuable information about the region’s agricultural carrying capacity and the nature and extent of human occupation in pre-Columbian times and, therefore, help adopt better informed conservation and development strategies for Amazonia in the future. However, before tackling these issues we need to further our understanding of why pre-Columbian raised fields were built and how they were managed in the past. Published data on raised fields in the LM is contrasted with new data gathered from field and remote sensing images. Raised fields have been analysed in relation to the hydrology, soil, topography and paleoclimate of the areas where they are found. In light of this new data we believe that there are grounds to question the current model that suggests raised field agriculture provided high yields without the need of fallow periods, representing a kind of pre-Columbian green revolution. Our alternative proposal suggests that raised field agriculture allowed pre-Columbian peoples to mitigate the risk of more intense and frequent flooding than is experienced today in the LM. We show that raised fields were built only in those areas where there were no alternatives, which do not coincide with those areas where pre-Columbian societies seem to have flourished and reached high levels of social complexity.     

Late Pleistocene marine birds from southern Peru: distinguishing human capture from El Niño-induced windfall

The Central Andean hyperarid littoral has abundant marine fauna that would have been attractive to the earliest inhabitants. Whether people hunted or scavenged marine animals during the terminal Late Pleistocene have social and technological implications for understanding ancient Andean foraging. The periodic phenomenon of El Niño/Southern Oscillation (ENSO) disrupts marine food chains and results in the death of significant numbers of marine vertebrates and microorganisms. The onset of ancient El Niño events may have created a subsistence opportunity for human coastal inhabitants along the Pacific coast of the Central Andes when large numbers of guano-producing birds (cormorants, boobies, and pelicans) became weak and eventually died. The remains of numerous marine birds dominate the Late Pleistocene archaeological site of Quebrada Tacahuay in far southern Peru. This Terminal Pleistocene occupation dating to 10,770–10,290 years ago (uncalibrated radiocarbon years; 12,880–11,970 calendar years ago) was buried and sealed by an apparent ancient El Niño-induced debris flow. Using characteristics of the faunal assemblage I assess whether people hunted marine birds or ENSO created a subsistence opportunity for people to either scavenge a catastrophic assemblage or collect a community of vulnerable birds prior to the debris flow. I present avian skeletal part frequencies, butchering patterns, and the quantities and variety of marine bony fishes. An analysis of vertebrate taxonomic and skeletal composition in conjunction with an analysis of site context does not support the hypothesis that paleoenvironmental conditions generated an opportunity for the facile collection of either dead or weak birds. In contrast, the faunal data suggest that humans actively hunted, captured, and consumed healthy marine birds. When evaluating the possible role of environmental fluctuations on human behavior and diet, researchers must consider not only the taphonomy of the most abundant remains, but also how other vertebrate taxa in a region are affected as well as the archaeological context.     

Do Workers Benefit from Industrial Agglomeration?*

Abstract. This paper provides an empirical investigation of the advantages accruing to workers in industrial clusters. Using a unique data set based on the Cluster Mapping Project of the Italian National Statistical Institute, we examine whether industry agglomeration leads to wage and labor mobility differentials. We estimate complete Mincerian wage equations, investigating whether returns to seniority and education are a possible source of differentiation. We find that working in an industrial cluster reduces the returns to education, does not affect the returns to seniority, and does not provide average wage premia. On the other hand, industrial agglomeration positively affects the likelihood of being employed, of starting a business, and of making a transition from payroll employment to entrepreneurship; it also increases blue‐collar worker mobility across jobs.