Mars’ plasma system. Scientific potential of coordinated multipoint missions: “The next generation”

The objective of this White Paper, submitted to ESA’s Voyage 2050 call, is to get a more holistic knowledge of the dynamics of the Martian plasma system, from its surface up to the undisturbed solar wind outside of the induced magnetosphere. This can only be achieved with coordinated multi-point observations with high temporal resolution as they have the scientific potential to track the whole dynamics of the system (from small to large scales), and they constitute the next generation of the exploration of Mars analogous to what happened at Earth a few decades ago. This White Paper discusses the key science questions that are still open at Mars and how they could be addressed with coordinated multipoint missions. The main science questions are: (i) How does solar wind driving impact the dynamics of the magnetosphere and ionosphere? (ii) What is the structure and nature of the tail of Mars’ magnetosphere at all scales? (iii) How does the lower atmosphere couple to the upper atmosphere? (iv) Why should we have a permanent in-situ Space Weather monitor at Mars? Each science question is devoted to a specific plasma region, and includes several specific scientific objectives to study in the coming decades. In addition, two mission concepts are also proposed based on coordinated multi-point science from a constellation of orbiting and ground-based platforms, which focus on understanding and solving the current science gaps.

Capitalism and democracy in the twenty-first century: does it still take two to tango?

This article reviews three books that offer thought-provoking insights on a central political science question, namely the relationship between capitalism and democracy in the twenty-first century. First, ‘Democracy and Prosperity’ by Iversen and Soskice posits a symbiotic relationship between capitalism and democracy. Advanced capital thrives on nationally rooted institutions, hence it needs democratic politics. A majority of voters ask for pro-advanced-capital reforms, hence democratic politics needs advanced capital. Second, ‘Capitalism, Alone’ by Milanovic depicts a troubled coexistence between capitalism and democracy. The former's tendency to concentrate economic and political power in the hands of the few is the main reason why democratic politics is under pressure. Third, ‘The Age of Surveillance Capitalism’ by Zuboff suggests a negative relationship between digital capitalism and democracy. Surveillance capitalism increasingly acts as a control means of individuals' behaviour, which undermines democracy at its roots. The last section brings the three contributions together. It maintains that a mutually beneficial coexistence between capitalism and democracy currently faces both internal (from within) and external (from without) challenges. In line with Milanovic and Zuboff, it argues that the concentration of economic and political power in the hands of the few is the most apparent from-within challenge. Drawing on Milanovic, it contends that rise of China as a global power combining capitalism with non-democracy challenges the relationship between capitalism and democracy from without. Finally, it contends that the environmental question and the pandemic represent two windows of opportunity for democracy to recover lost ground and re-establish a more balanced relationship with capitalism.

The Polarimetric and Helioseismic Imager on Solar Orbiter

Aims. This paper describes the Polarimetric and Helioseismic Imager on the Solar Orbiter mission (SO/PHI), the first magnetograph and helioseismology instrument to observe the Sun from outside the Sun-Earth line. It is the key instrument meant to address the top-level science question: How does the solar dynamo work and drive connections between the Sun and the heliosphere? SO/PHI will also play an important role in answering the other top-level science questions of Solar Orbiter, while hosting the potential of a rich return in further science. Methods. SO/PHI measures the Zeeman effect and the Doppler shift in the Fe I 617.3 nm spectral line. To this end, the instrument carries out narrow-band imaging spectro-polarimetry using a tunable LiNbO3 Fabry-Perot etalon, while the polarisation modulation is done with liquid crystal variable retarders. The line and the nearby continuum are sampled at six wavelength points and the data are recorded by a 2k × 2k CMOS detector. To save valuable telemetry, the raw data are reduced on board, including being inverted under the assumption of a Milne-Eddington atmosphere, although simpler reduction methods are also available on board. SO/PHI is composed of two telescopes; one, the Full Disc Telescope, covers the full solar disc at all phases of the orbit, while the other, the High Resolution Telescope, can resolve structures as small as 200 km on the Sun at closest perihelion. The high heat load generated through proximity to the Sun is greatly reduced by the multilayer-coated entrance windows to the two telescopes that allow less than 4% of the total sunlight to enter the instrument, most of it in a narrow wavelength band around the chosen spectral line. Results. SO/PHI was designed and built by a consortium having partners in Germany, Spain, and France. The flight model was delivered to Airbus Defence and Space, Stevenage, and successfully integrated into the Solar Orbiter spacecraft. A number of innovations were introduced compared with earlier space-based spectropolarimeters, thus allowing SO/PHI to fit into the tight mass, volume, power and telemetry budgets provided by the Solar Orbiter spacecraft and to meet the (e.g. thermal) challenges posed by the mission’s highly elliptical orbit.

Content Validation of Basic Education Certificate Examination Questions in Basic Science in Adamawa State, Nigeria

The study assessed the content validation of Basic Education Certificate Examination (BECE) questions in Basic Science set by Adamawa State Educational Resource Centre (ERC), Yola, Nigeria. This was to determine the representativeness of the topics and their levels of the cognitive domain in the Junior Secondary School Basic Science curriculum in the Basic Education Certificate Examination in Basic Science question papers from 2013 to 2017. Document analysis research design was adopted for the study. The population of the study comprised all past Basic Education Certificate Examination questions in Basic Science. The research instrument used for the data collection was a designed checklist along table of specification. A pilot study was conducted and a reliability index of 0.86 was obtained using Cronbach alpha analysis. Three research questions were raised with two hypotheses tested at 0. 05 level of significance. The result of the findingp=0.000 revealed that there is no significant difference between the topics in the Basic Science curriculum and those examined in the Basic Education Certificate Examination questions in Basic Science. Again, the result 0.675 showed that there is significant difference between the weights assigned to the various levels of cognitive domain in the Basic Science curriculum and those weights assigned to them in Basic Education Certificate Examination Basic Science question papers. Based on the findings, it was recommended that re-training, workshops, conferences and seminars should be organized for Basic Science teachers and external examiners regularly to update their knowledge on test construction.