The reliability and comparability of international Teaching Posters migration statistics belong to the most important statistical issues due to the importance of correct dimensioning of the migration flows and stocks for effective and timely design of effective policy measures.This paper presents an assessment of the migration statistics provided b

In this work we study the Zeeman effect on stratospheric O2 using ground-based microwave radiometer measurements.The interaction of the Earth magnetic field with the oxygen dipole leads to a splitting of O2 energy states, which polarizes the emission spectra.A special campaign was carried out in order to measure this effect in the oxygen emission l