Spectral characteristics of hydromagnetic waves in the magnetosphere

1987 ◽  
Vol 38 (2) ◽  
pp. 235-243 ◽  
Author(s):  
S. P. Kuo ◽  
M. C. Lee ◽  
A. Wolfe
Keyword(s):  
Turning Point ◽  
Spectral Characteristics ◽  
Turning Points ◽  
Resonant Mode ◽  
Period Range ◽  
Plasma Density Profile ◽  
Cavity Modes ◽  
Hydromagnetic Waves ◽  
Radial Axis ◽  
East West

This work is intended to explain why the resonant response of the magnetosphere prefers to have discrete frequencies. Using a cylindrical model for the outer magnetosphere with a plasma density profile proportional to 1/r, we show that the eigenequation characterizing the eigenmodes of the hydromagnetic waves in this model has two turning points along the radial axis. The locations of the turning points depend upon the values of the eigenperiod and the associated east-west wavenumber of the eigenmode. The energy spectrum of the excited cavity modes is seen to have sharp peaks at discrete frequencies when the surface perturbations have a uniform spectrum in the frequency range of interest. We, therefore, have also shown that only the discrete set of the magnetospheric cavity eigenmodes can efficiently couple the perturbations excited on the boundary of the magnetosphere to the field-line resonant mode excited inside the inner turning point of the cavity eigenmode. The most likely values of east-west wavenumbers and wave period range are determined.

Fragmenting Feminine-Athletic Identities: Identity Turning Points During Girls’ Transition into High School

2021 ◽  
pp. 216747952110129
Author(s):  
Alaina C. Zanin ◽  
Laura V. Martinez ◽  
Lucy C. Niess
Keyword(s):  
High School ◽  
Identity Development ◽  
Turning Point ◽  
Communication Theory ◽  
Sport Participation ◽  
Female Athletes ◽  
Turning Points ◽  
Athletic Identity ◽  
Communication Theory Of Identity ◽  
And Gender

This study employed a turning point analysis to document events that influence the development of athletic identities in female athletes transitioning into high school. All participants ( N = 28), between the ages of 14–15 years old, belonged to a competitive club soccer team located in the southwestern United States. Through an analysis of pre- and post-season interviews and bi-weekly video journal entries, data revealed several fragmenting turning point events related to participants’ athletic identity development. These fragmenting turning points paired with the communication theory of identity (CTI) framework highlighted three identity gaps: (a) athletic-relational, (b) athletic-communal, and (c) athletic-enacted. Theoretical and practical implications are discussed regarding turning points in relation to athletic identity development and gender disparities in sport participation.

Judging the stance of the business cycle

2021 ◽  
pp. 222-240
Author(s):  
Jesper Rangvid
Keyword(s):  
Business Cycle ◽  
Turning Point ◽  
Turning Points ◽  
Leading Indicators ◽  
Economic Variables ◽  
Near Term ◽  
The Business Cycle

This chapter describes if and how we can detect business-cycle turning points. What variables should we study if we want to say something about the likelihood that the business cycle will change? The chapter discusses business-cycle ‘indicators’. It distinguishes between lagging, coincident, and leading indicators. Lagging indicators refer to economic variables that react to a change in the business cycle, i.e. variables that react after a business-cycle turning point. Coincident indicators tell us something about where we are right now in the business cycle. Leading indicators, which are probably the most important ones, tell us about the near-term outlook for the business cycle, i.e. forecast the business cycle. The chapter emphasizes that business-cycle turning points are hard to predict, but also that some indicators are more informative than others.

(Re)Constructing Relationships with Grandparents: A Turning Point Analysis of Granddaughters' Relational Development with Maternal Grandmothers

1998 ◽  
Vol 46 (4) ◽  
pp. 287-303 ◽  
Author(s):  
Sherry Holladay ◽  
Rita Lackovich ◽  
Margaret Lee ◽  
Mindy Coleman ◽  
David Harding ◽  
...  
Keyword(s):  
Turning Point ◽  
Turning Points ◽  
Transition To College ◽  
Relational Development ◽  
Negative Experiences ◽  
Point Analysis ◽  
The Family ◽  
Relational Closeness ◽  
Geographic Separation ◽  
Interviewing Technique

This study explores how granddaughters account for the development of their relationships with their maternal grandmothers. The retrospective interviewing technique was used to elicit turning points in their relational histories. Analysis of the turning point content revealed several different types of turning points that reflected both normative and idiosyncratic events. Increases in relational closeness resulted from decreases in geographic separation, engaging in shared activities, deaths or serious illnesses in the family, and family disruptions. Decreases in closeness were associated with negative experiences with the grandmother, increases in geographic separation, and the transition to college. Granddaughters reported that turning points related to death or serious illness and participation in shared activities were the most significant ones in their relationships with maternal grandmothers.

Turning Points in Labor Migration: The Case of Hong Kong

1994 ◽  
Vol 3 (1) ◽  
pp. 93-118 ◽  
Author(s):  
Ronald Skeldon
Keyword(s):  
Hong Kong ◽  
Rural Population ◽  
Labor Migration ◽  
Turning Point ◽  
Turning Points ◽  
Emigration And Immigration ◽  
Complex Sequence ◽  
Professional Workers ◽  
Developmental Characteristics ◽  
City State

The Hong Kong experience of emigration and immigration does not fit neatly into models of migration transition. As a city-state with a small rural population, it has exhibited different developmental characteristics from the larger Asian newly industrialized economies. Geopolitical factors have also played a key role in “patterns” of migration, such as restrictive immigration policies in receiving countries. Also significant are individual considerations of political and economic risk, as evidenced by the current rise in the emigration of skilled and professional workers prior to the return of Hong Kong to China. The author concludes that, rather than a simple turning point in labor migration, there may be multiple turning points in a complex sequence of change.

scholarly journals Saving Money by Cutting Corners

1976 ◽  
Vol 29 (4) ◽  
pp. 418-420
Author(s):  
J. D. Proctor
Keyword(s):  
Turning Point ◽  
Standard Procedure ◽  
Turning Points ◽  
Operating Costs ◽  
The Difference

This note assesses the savings in (time- and fuel-dependent) direct operating costs that are possible if every turning point on an airway is passed on the inside. Figure 1 shows a route with turning points at A, B and C. If a pilot follows the standard procedure of flying along AB until he is sure that he has passed B, his total track distance is (c + d + a + b).To simplify the mathematics let us assume that he turns instead through half the required angle at a distance d before he reaches B and completes the turn after passing B abeam (and very close). His track distance will be (c + e + f). The difference in distance δ, representing the saving, is therefore (d + a + b) – (e + f).

scholarly journals Investigation of the relationship between optical auroral forms and HF radar E region backscatter

2000 ◽  
Vol 18 (6) ◽  
pp. 608-617 ◽  
Author(s):  
S. E. Milan ◽  
M. Lester ◽  
N. Sato ◽  
H. Takizawa ◽  
J.-P. Villain
Keyword(s):  
Spectral Characteristics ◽  
Hf Radar ◽  
Vhf Radar ◽  
The Past ◽  
Optical Signature ◽  
E Region ◽  
Coherent Backscatter ◽  
First Time ◽  
The Relationship ◽  
East West

Abstract. The SuperDARN HF radars have been employed in the past to investigate the spectral characteristics of coherent backscatter from L-shell aligned features in the auroral E region. The present study employs all-sky camera observations of the aurora from Husafell, Iceland, and the two SuperDARN radars located on Iceland, Þykkvibær and Stokkseyri, to determine the optical signature of such backscatter features. It is shown that, especially during quiet geomagnetic conditions, the backscatter region is closely associated with east-west aligned diffuse auroral features, and that the two move in tandem with each other. This association between optical and radar aurora has repercussions for the instability mechanisms responsible for generating the E region irregularities from which radars scatter. This is discussed and compared with previous studies investigating the relationship between optical and VHF radar aurora. In addition, although it is known that E region backscatter is commonly observed by SuperDARN radars, the present study demonstrates for the first time that multiple radars can observe the same feature to extend over at least 3 h of magnetic local time, allowing precipitation features to be mapped over large portions of the auroral zone.Key words: Ionosphere (particle precipitation; plasma waves and instabilities)

scholarly journals The Regularized Trace Formula of the Spectrum of a Dirichlet Boundary Value Problem with Turning Point

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Zaki F. A. El-Raheem ◽  
A. H. Nasser
Keyword(s):  
Boundary Value Problem ◽  
Trace Formula ◽  
Turning Point ◽  
Dirichlet Boundary ◽  
Infinite Sequence ◽  
Boundary Value ◽  
Turning Points ◽  
Dirichlet Boundary Value Problem ◽  
Regularized Trace

We calculate the regularized trace formula of the infinite sequence of eigenvalues for some version of a Dirichlet boundary value problem with turning points.

scholarly journals The Trauma of Loss as a Turning Point in Elizabeth Gaskell’s Works

2020 ◽  
Vol 9 (1) ◽  
pp. 33-47
Author(s):  
Blanca Puchol Vázquez
Keyword(s):  
Turning Point ◽  
Turning Points ◽  
Elizabeth Gaskell ◽  
Traumatic Experiences ◽  
Literary Works

AbstractThe aim of this paper is to look into how Elizabeth Gaskell reflects trauma in her literary works and what she may have been trying to teach her audience through them. As a social and realist writer, she used narrative as a means to denounce the evils of her time, many of which give rise to social traumas. However, this paper will focus on more personal traumas, particularly the trauma of loss, and also how Gaskell handles these traumatic experiences in her writings. With this purpose in mind, it is important to consider Gaskell’s own experience, how she overcame her own traumatic losses and how she used fiction both to reflect her experience and as a form of therapy. At the end of this paper, we will establish how Gaskell uses traumatic losses as turning points throughout her literary works.

scholarly journals Przełomy, kryzysy, ewolucje

2019 ◽  
pp. 323-337
Author(s):  
Wojciech Bałus
Keyword(s):  
Art History ◽  
Turning Point ◽  
Turning Points ◽  
En Bloc ◽  
Artistic Creation ◽  
History Of Art ◽  
History Of ◽  
State Of Affairs

When Aristotle asked at what particular moment we can say that an army is fleeing, which is certainly not when individual soldiers start leaving the battlefield, he formulated a problem that is important also for today’s art history: are there any moments in the history of art that can be called turning points? In individual artistic careers, such points are related to crises, allowing the artist to overcome an impasse and find a way toward reaching a goal. Quite often, such a turn occurs suddenly, at some particular moment which ancient Greeks called the kairos. The changes in art approached en bloc also happen thanks to the background of values and some goal of artistic creation. A turning point may imply overcoming a crisis or a period of decline and decadence – always a state of affairs defined in negative terms. A separate case is definitely a political decree that triggers off a change, which implies violence committed on culture. Finally, in academic art history a turning point may be related not only with a crisis, but also with evolution. It’s perception is relative, but because of that the history of art can be rewritten. 

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