scholarly journals Sporadic auroras near the geomagnetic equator: in the Philippines, on 27 October 1856

2018 ◽  
Vol 36 (4) ◽  
pp. 1153-1160 ◽  
Author(s):  
Hisashi Hayakawa ◽  
José M. Vaquero ◽  
Yusuke Ebihara
Keyword(s):  
Magnetic Activity ◽  
The Philippines ◽  
Magnetic Storms ◽  
Geomagnetic Equator ◽  
Physical Explanation ◽  
Low Latitude ◽  
Magnetic Latitude ◽  
Considerable Size

Abstract. While low-latitude auroral displays are normally considered to be a manifestation of magnetic storms of considerable size, Silverman (2003, JGR, 108, A4) reported numerous “sporadic auroras” which appear locally at relatively low magnetic latitude during times of just moderate magnetic activity. Here, a case study is presented of an aurora near the geomagnetic equator based on a report from the Philippine islands on 27 October 1856. An analysis of this report shows it to be consistent with the known cases of sporadic auroras, except for its appearance at considerably low magnetic latitude. The record also suggests that an extremely low-latitude aurora is not always accompanied by large magnetic storms. The description of its brief appearance leads to a possible physical explanation based on an ephemeral magnetospheric disturbance provoking this sporadic aurora.

scholarly journals Sporadic Aurora near Geomagnetic Equator: In the Philippines, on 27 October 1856

2018 ◽  
Author(s):  
Hisashi Hayakawa ◽  
José M. Vaquero ◽  
Yusuke Ebihara
Keyword(s):  
Magnetic Activity ◽  
The Philippines ◽  
Magnetic Storms ◽  
Geomagnetic Equator ◽  
Physical Explanation ◽  
Low Latitude ◽  
Magnetic Latitude ◽  
Considerable Size

Abstract. While low latitude auroral displays are normally considered to be a manifestation of magnetic storms of considerable size, Silverman (2003, JGR, 108, A4) reported numerous sporadic auroras which appear locally at relatively low magnetic latitudes during times of just moderate magnetic activity. Here, a case study is presented of an aurora near the geomagnetic equator based on a report from the Philippine Islands on 27 October 1856. An analysis of this report shows it to be consistent with the known cases of sporadic aurorae except for its considerably low magnetic latitude. The record also suggests that extremely low-latitude aurora is not always accompanied with large magnetic storms. The description of its brief appearance leads to a possible physical explanation based on an ephemeral magnetospheric disturbance provoking this sporadic aurora.

Some Dilemmas of Political Consumerism

2018 ◽  
pp. 720-740
Author(s):  
Sarah Webb ◽  
Anna Cristina Pertierra
Keyword(s):  
Middle Class ◽  
Environmentally Friendly ◽  
The Philippines ◽  
Rural Poor ◽  
Political Consumerism ◽  
Palawan Island ◽  
Class Distinction

In the Philippines, socioeconomic relations that result from deeply uneven market engagements have long made consumption a moral affair. Ecoconscious lifestyles and consumer practices remain largely the domain of elite and middle-class Filipinos, and as such, engagement with sustainable and environmentally friendly consumption may be seen not only as a marker of class distinction but also as a critique of urban and rural poor livelihood practices deemed to be environmentally detrimental. Focusing on a case study from Palawan Island, the chapter discusses some dilemmas that have arisen as the application of “eco” to tourism practices has become widespread and attractive to middle-class Filipinos with steadily growing spending power. The relevance of class to considering dilemmas of political consumerism is not unique to the Philippines, and these issues provide an opportunity to critically reflect on who benefits from political consumerism.

scholarly journals Attrition as a bottom-up pathway to subnational democratization

2021 ◽  
pp. 019251212110192
Author(s):  
Trix van Mierlo
Keyword(s):  
Civil Society ◽  
Field Research ◽  
Building Blocks ◽  
The Philippines ◽  
Causal Process ◽  
Bottom Up ◽  
System A ◽  
Extensive Field ◽  
Democratic System

Oftentimes, democracy is not spread out evenly over the territory of a country. Instead, pockets of authoritarianism can persist within a democratic system. A growing body of literature questions how such subnational authoritarian enclaves can be democratized. Despite fascinating insights, all existing pathways rely on the actions of elites and are therefore top-down. This article seeks to kick-start the discussion on a bottom-up pathway to subnational democratization, by proposing the attrition mechanism. This mechanism consists of four parts and is the product of abductive inference through theory-building causal process tracing. The building blocks consist of subnational democratization literature, social movement theory, and original empirical data gathered during extensive field research. This case study focuses on the ‘Dynasty Slayer’ in the province of Isabela, the Philippines, where civil society actors used the attrition mechanism to facilitate subnational democratization. This study implies that civil society actors in subnational authoritarian enclaves have agency.

Conceptualizing International Labor Migration: A Structuration Perspective

1995 ◽  
Vol 29 (2) ◽  
pp. 317-351 ◽  
Author(s):  
Jon Goss ◽  
Bruce Lindquist
Keyword(s):  
Social Networks ◽  
Labor Migration ◽  
Structuration Theory ◽  
The Philippines ◽  
Levels Of Analysis ◽  
International Labor ◽  
Anthony Giddens ◽  
Theory Of Structuration ◽  
International Labor Migration

This article applies the theory of structuration to international labor migration using case study material from the Philippines. It first provides a brief review of the functional and structural approaches to understanding labor migration and the theoretical impasse that has been created between them. It then reviews several attempts to resolve this impasse, including systems and networks approaches; these solutions are rejected on theoretical and empirical grounds. We suggest that migrant institutions may be a more appropriate mid-level concept than households or social networks to articulate various levels of analysis. We develop this concept in the context of the structuration theory of Anthony Giddens and attempt to apply this to the Philippines, concluding that this framework is eminently suited for further research on international labor migration.

The application of system dynamics as a framework for establishing sustainable cave management policies: a case study in the Philippines

2018 ◽  
Vol 17 (2/3) ◽  
pp. 197 ◽  
Author(s):  
Nemi Lorraine S. Escalante ◽  
Jonathan A. Uy ◽  
Hanah Marie M. Tonggol ◽  
Amando A. Radomes <suffix>Jr.</suffix> ◽  
Lanndon A. Ocampo
Keyword(s):  
System Dynamics ◽  
The Philippines ◽  
Cave Management ◽  
Management Policies

scholarly journals Case study on total electron content enhancements at low latitudes during low geomagnetic activities before the storms

2008 ◽  
Vol 26 (4) ◽  
pp. 893-903 ◽  
Author(s):  
◽  
◽  
◽  
Keyword(s):  
Total Electron Content ◽  
Geomagnetic Activity ◽  
Electron Content ◽  
Low Latitude ◽  
Total Electron ◽  
Defense Meteorological Satellite Program ◽  
Low Latitudes ◽  
Global Ionospheric Maps ◽  
Geomagnetic Activities

Abstract. Sometimes the ionospheric total electron content (TEC) is significantly enhanced during low geomagnetic activities before storms. In this article, we investigate the characteristics of those interesting TEC enhancements using regional and global TEC data. We analyzed the low-latitude TEC enhancement events that occurred around longitude 120° E on 10 February 2004, 21 January 2004, and 4 March 2001, respectively. The TEC data are derived from regional Global Positioning System (GPS) observations in the Asia/Australia sector as well as global ionospheric maps (GIMs) produced by Jet Propulsion Laboratory (JPL). Strong enhancements under low geomagnetic activity before the storms are simultaneously presented at low latitudes in the Asia/Australia sector in regional TEC and JPL GIMs. These TEC enhancements are shown to be regional events with longitudinal and latitudinal extent. The regions of TEC enhancements during these events are confined at narrow longitude ranges around longitude 120° E. The latitudinal belts of maxima of enhancements locate around the northern and southern equatorial ionization anomaly (EIA) crests, which are consistent with those low-latitude events presented by Liu et al. (2008). During the 4 March 2001 event, the total plasma density Ni observed by the Defense Meteorological Satellite Program (DMSP) spacecraft F13 at 840 km altitude are of considerably higher values on 4 March than on the previous day in the TEC enhanced regions. Some TEC enhancement events are possibly due to contributions from auroral/magnetospheric origins; while there are also quasi-periodic enhancement events not related to geomagnetic activity and associated probably with planetary wave type oscillations (e.g. the 6 January 1998 event). Further investigation is warrented to identify/separate contributions from possible sources.

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