The electromagnetic spectrum is a vital part of our environment. Measures of radio frequency emissions from natural phenomena enable both practical applications, such as weather predictions and studies of the changing of Earth's climate here at home, and reveal the physical properties of cosmic sources. The spectrum is therefore a resource to be used wisely now and to be protected for future generations. Handbook of Frequency Allocations and Spectrum Protection for Scientific Uses: Second Edition sets forth the principles for the allocation and protection of spectral bands for services using the radio spectrum for scientific research. This report describes the radio frequency bands used by scientific services and includes relevant regulatory information and discussion of scientific use of frequency bands. This reference will guide spectrum managers and spectrum regulatory bodies on science issues and serve as a resource to scientists and other spectrum users.

A state-of-the-art account of what we know and do not know about the effects of digital technology on democracy.

The cocreator of the Washington Post’s “Made by History” blog reveals how the rise of conservative talk radio gave us a Republican Party incapable of governing and paved the way for Donald Trump. America’s long road to the Trump presidency began on August 1, 1988, when, desperate for content to save AM radio, top media executives stumbled on a new format that would turn the political world upside down. They little imagined that in the coming years their brainchild would polarize the country and make it nearly impossible to govern. Rush Limbaugh, an enormously talented former disc jockey—opinionated, brash, and unapologetically conservative—pioneered a pathbreaking infotainment program that captured the hearts of an audience no media executive knew existed. Limbaugh’s listeners yearned for a champion to punch back against those maligning their values. Within a decade, this format would grow from fifty-nine stations to over one thousand, keeping millions of Americans company as they commuted, worked, and shouted back at their radios. The concept pioneered by Limbaugh was quickly copied by cable news and digital media. Radio hosts form a deep bond with their audience, which gives them enormous political power. Unlike elected representatives, however, they must entertain their audience or watch their ratings fall. Talk radio boosted the Republican agenda in the 1990s, but two decades later, escalation in the battle for the airwaves pushed hosts toward ever more conservative, outrageous, and hyperbolic content. Donald Trump borrowed conservative radio hosts’ playbook and gave Republican base voters the kind of pugnacious candidate they had been demanding for decades. By 2016, a political force no one intended to create had completely transformed American politics.

Mexican Waves is the fascinating history of how borderlands radio stations shaped the identity of an entire region as they addressed the needs of the local population and fluidly reached across borders to the United States. In so doing, radio stations created a new market of borderlands consumers and worked both within and outside the constraints of Mexican and U.S. laws. Historian Sonia Robles examines the transnational business practices of Mexican radio entrepreneurs between the Golden Age of radio and the early years of television history. Intersecting Mexican history and diaspora studies with communications studies, this book explains how Mexican radio entrepreneurs targeted the Mexican population in the United States decades before U.S. advertising agencies realized the value of the Spanish-language market. Robles’s robust transnational research weaves together histories of technology, performance, entrepreneurship, and business into a single story. Examining the programming of northern Mexican commercial radio stations, the book shows how radio stations from Tijuana to Matamoros courted Spanish-language listeners in the U.S. Southwest and local Mexican audiences between 1930 and 1950. Robles deftly demonstrates Mexico’s role in creating the borderlands, adding texture and depth to the story. Scholars and students of radio, Spanish-language media in the United States, communication studies, Mexican history, and border studies will see how Mexican radio shaped the region’s development and how transnational listening communities used broadcast media’s unique programming to carve out a place for themselves as consumers and citizens of Mexico and the United States.