Clear reception of radio signals depends upon the ability to exclude unwanted noise. Noise from natural sources takes two forms, atmospheric and extraterrestrial. Atmospherics result from the electromagnetic disturbances caused by lightning in thunderstorms and are at a maximum at night and in summer and in the tropical latitudes. Extraterrestrial noise interferes with radio communication in the VHF band (and down to 20 mc). It is due to electromagnetic phenomena of galactic or solar origin. Solar noise increases during the daytime and during peak periods in the 11-year sunspot cycle. Solar flares and geomagnetic storms may produce radio communication blackouts, particularly in the polar regions.
The Encyclopedia of World Problems and Human Potential is a unique, experimental research work of the Union of International Associations. It is currently published as a searchable online platform with profiles of world problems, action strategies, and human values that are interlinked in novel and innovative ways. These connections are based on a range of relationships such as broader and narrower scope, aggravation, relatedness and more. By concentrating on these links and relationships, the Encyclopedia is uniquely positioned to bring focus to the complex and expansive sphere of global issues and their interconnected nature.
The initial content for the Encyclopedia was seeded from UIA’s Yearbook of International Organizations. UIA’s decades of collected data on the enormous variety of association life provided a broad initial perspective on the myriad problems of humanity. Recognizing that international associations are generally confronting world problems and developing action strategies based on particular values, the initial content was based on the descriptions, aims, titles and profiles of international associations.
Non-profit, apolitical, independent, and non-governmental in nature, the UIA has been a pioneer in the research, monitoring and provision of information on international organizations, international associations and their global challenges since 1907.