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4.1 Introduction to Political Geography 4.2 Political Processes 4.3 Political Power and Territoriality 4.4 Defining Political Boundaries 4.5 The Function of Political Boundaries 4.6 Internal Boundaries 4.7 Forms of Governance 4.8 Defining Devolutionary Factors 4.9 Challenges to Sovereignty 4.10 Consequences of Centrifugal and Centripetal Forces
F2 propagation (F2-skip) is the reflection of VHF signals off the F2 layer of the ionosphere. The phenomenon is rare compared to other forms of propagation (such as sporadic E propagation , or E-skip) but can reflect signals thousands of miles beyond their intended broadcast area, substantially farther than E-skip.