Researchers from HSE University and the Space Research Institute of the Russian Academy of Sciences analysed seven years of data from the ERG (Arase) satellite and, for the first time, provided a detailed description of a new type of radio emission from near-Earth space—the hectometric continuum, first discovered in 2017. The researchers found that this radiation appears a few hours after sunset and disappears one to three hours after sunrise. It was most frequently observed during the summer months and less often in spring and autumn. However, by mid-2022, when the Sun entered a phase of increased activity, the radiation had completely vanished—though the scientists believe the signal may reappear in the future. The study has been published in the Journal of Geophysical Research: Space Physics.

The research team led by Dr. Jang SeGyu at the Functional Composite Materials Research Center of the Korea Institute of Science and Technology (KIST, President Oh Sang-rok) and the research team led by Professor Choi Siyoung at the Department of Bio and Chemical Engineering of the Korea Advanced Institute of Science and Technology (KAIST, President Lee Kwang-hyung) announced the development of a high-density BNNT protective shield. This shield, created by densely-packed BNNTs, is robust, efficiently conducts heat, and effectively blocks cosmic radiation.

Low earth orbit (LEO) mega-constellations, characterized by dense satellite coverage and low transmission latency, have substantial advantages in global communications, earth observation, and disaster forecasting. Compared to traditional constellations with simple configurations, mega-constellations have a large number of nodes and complex satellite interaction relationships and are oriented to vast global missions. As a result, when the traditional ground-based centralized management mode is applied to a mega-constellation, the ground station suffers from an explosive growth of control load and struggles to achieve the efficient, timely, and orderly operation of the mega-constellation. Therefore, it is necessary to adjust the management architecture to partially transfer the on-ground management mission to on-board management mission. Clustering satellites into multiple management domains and implementing unified management within each domain is an effective method for realizing on-board management of mega-constellations. Existing studies on the construction of satellite management domains have focused on some specific indicators, such as spatial distribution uniformity, network control latency, and controller load. Considering the highly dynamic motion of the mega-constellation, a fixed management domain construction will inevitably lead to frequent updates of the management architecture, thereby increasing the burden of on-board management. Thus, more stable strategies for constructing and updating the management domain need to be explored to reduce the frequency of management architecture updates over extended mission periods.

A Japanese research team has studied the variations in beryllium-7 concentrations in the surface air over the Antarctic regions of Southern Ocean. Beryllium-7 is a radioactive isotope of beryllium produced by cosmic rays in the atmosphere. The team explored, over space and time, how the beryllium-7 is transported from the atmosphere to the Earth’s surface. Their goal was to better understand the mechanisms of atmospheric mixing on Earth.

The University of Hong Kong (HKU) announced the inauguration of the Hong Kong Institute for Astronomy and Astrophysics (HKIAA) with a plaque-unveiling ceremony on 3 November. The event gathered world leading scientists and government dignitaries to herald a new era of astronomical research in the region.