Self-consistent multifluid MHD simulations of Europa's exospheric interaction with Jupiter's magnetosphere

The Jovian moon, Europa, hosts a thin neutral gas atmosphere, which is tightly coupled to Jupiter's magnetosphere. Magnetospheric ions impacting the surface sputter off neutral atoms, which, upon ionization, carry currents that modify the magnetic field around the moon. The magnetic field in the plasma is also affected by Europa's induced magnetic field. In this paper we investigate the environment of Europa using our multifluid MHD model and focus on the effects introduced by both the magnetospheric and the pickup ion populations. The model self-consistently derives the electron temperature that governs the electron impact ionization process, which is the major source of ionization in this environment. The resulting magnetic field is compared to measurements performed by the Galileo magnetometer, the bulk properties of the modeled thermal plasma population is compared to the Galileo Plasma Subsystem observations, and the modeled surface precipitation fluxes are compared to Galileo Ultraviolet Spectrometer observations. The model shows good agreement with the measured magnetic field and reproduces the basic features of the plasma interaction observed at the moon for both the E4 and the E26 flybys of the Galileo spacecraft. The simulation also produces perturbations asymmetric about the flow direction that account for observed asymmetries.

Myanmar migrant laborers in Ranong, Thailand

Thailand is the major destination for migrants in mainland Southeast Asia, and Myanmar (Burmese) migrants account for the dominant share. This paper sheds light on the actual working conditions and the life of Myanmar migrants in Thailand, based on our intensive survey in Ranong in southern Thailand in 2009. We found a wide range of serious problems that Myanmar migrants face in everyday life: very harsh working conditions, low income, heavy indebtedness, risk of being human-trafficking victims, harassment by the police and military (especially of sex workers), high risk of illness including malaria and HIV/AIDS and limited access to affordable medical facilities, and a poor educational environment for their children.

Corruption in Kazakhstan and the quality of governance

In Kazakhstan, uncover of numerous corruption scandals involving government officials has become almost a normal feature of life. Behind the high-profile acts of waging a battle against corruption, however, is a serious and systemic phenomenon. The most endemic form of corruption is the various transfers of funds in the state structures and national companies which remain opaque and thus unaccounted for. There are questions about the volumes and spending of revenues earned from natural resources, and there is no independent monitoring and control of the flow of funds in national oil and gas companies. The main actors involved in the shadow economy are state officials and informal pressure groups, who distribute resources among themselves, and accumulate wealth by way of legalising informal incomes or obtaining official business using connections. While important decision making is carried out among the close circles of the elite, formal institutions remain weak and ineffective.

Transition from black to official markets for foreign exchange in Myanmar

We address the puzzle why the black market for foreign exchange thrives in Myanmar despite the successful unification of multiple exchange rates. A closer look at the black market reveals that its enduring competitiveness stems from its lower transaction costs. A question arising from this observation is how the official market, namely banks, can compete with and replace the black market. Our empirical analysis based on an original questionnaire survey of private export firms regarding their choices of currency trading modes suggests that banks can attract exporters by exploiting the economies of scope between currency trading and lending.

Shedding light on the shadow economy : a nighttime light approach

Measuring the shadow economy is inherently difficult, but critical for understanding economic development. Using census data on formal and informal sectors in Cambodia, we document that 96.6% of non-farm establishments do not formally register with the government, and their sales accounted for 76.6% of total sales in 2011. We estimate a relationship between nighttime light and sales across regions separately for formal and informal firms for 2011, and estimate their past sales from changes in nighttime light for 1993-2010. Both formal and informal firms increased their estimated sales, and the share of informal sales increased from 68.8% in 1993 to 76.6% in 2011, suggesting that the informal sector increased quantitatively in both absolute and relative terms throughout the economic development of the Cambodian economy.