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Matthew I Zehnder, Landscape Architect/Regional Planner Matthew I Zehnder works for META Associates, Inc, a health-care strategic planning and program management rm, in Louisville, Kentucky He is senior vice president of landscape architecture and community planning The rm deals primarily with all developmental aspects of health-care projects, from the master planning of health-care assisted-living communities to forty-bed private care facilities He earned his Bachelor of Science in Landscape Architecture (BSLA) from the University of Kentucky in Lexington, Kentucky, in 1988 In 1993, he earned a master s degree in landscape architecture and regional planning from the University of Pennsylvania in Philadelphia

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Why do VLF signals strengthen at night instead of getting weaker If propagation is basically via the waveguide effect, why doesn t the signal drop DOWN at night when the waveguide disappears with the D layer Is there some kind of reduced absorption at night If so, where is it taking place and why Also, what accounts for the big fluctuations in signal strength at night, apparently more or less at random The strength of the received signal depends on the effective reflection coefficient of the region from which the radio wave reflects in its multi-hop path between Earth and the ionosphere In daytime the reflecting region is lower, the air density is higher, and the free electron density is controlled strongly by the solar radiation, etc At night time the reflecting region is higher, the air density is lower, and the free electron density is controlled by variable ambient conditions as well as variable influences from electron precipitation from above, etc At noon the electron density is about 10 electrons/cm3 at an altitude of 40 km, 100 electrons/cm3 at an altitude of 60 km, 1000 electrons/cm3 at an altitude of 80 km and 10,000 electrons/cm3 at an altitude of 85 km At night these figures become 10 electrons electrons/cm3 at 85 km, 100 electrons/cm3 at 88 km and 1000 electrons/cm3 at 95 km and then remains somewhat the same up to at least 140 km At night the electron density in the lower part of the D region pretty much disappears At 40 km the electron collision frequency is about 1,000,000,000 collisions per second whereas at 80 km the collision frequency drops to 1,000,000 collision per second The reflection coefficient depends on (among other things) the number density of free electrons, the collision frequency, and the frequency of the radio signal It is found by a mathematical integration throughout the entire D-region and of course the result depends on what time of the 24 hour day one performs the integration We can think of the E-Layer propagating the signal at night Then the prominent sunrise pattern we see is a shift from E-Layer propagation back to D-Layer as the sun rises and forms the daytime D-Layer.

You can build your own Sudden Ionospheric Disturbances (SIDs) receiver, shown in Figure 19-1, and begin your own investigation of solar flares and their effects on radio propagation The SIDs receiver is a simple VLF receiver designed to be used with a loop antenna which can be placed either inside or outside The receiver monitors the strong VLF signal from the US Navy NAA 24 kHz transmitter in Cutler Maine The Sudden Ionospheric Disturbance (SID) receiver is a modified Stokes Gyrator tuned VLF receiver based on the circuit from Communications Quarterly Spring 1994 pp 24 26 The main circuit diagram shown is Figure 19-2, it illustrates SIDs receiver which consists of two integrated circuits, a Texas Instruments RC4136 and a National LF353 operation amplifier The SIDs receiver is fed from a loop antenna at L1 The antenna is coupled to the SIDs receiver via a miniature 600 to 600 ohm matching transformer at T1 The output from the secondary of T1 is fed to two protection diodes at D1 and D2 at the front end of the receiver The output of the diode network is then coupled to a 100 pF capacitor at C1 Capacitor C2 is connected from the