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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |  |
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First Edition Preface Second Edition Preface Acknowledgments
Section E E index 61-69 of 498 terms
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echo overhangIn the radar echo associated with a severe thunderstorm, the portion of the echo that is located above the weak-echo region on the low-altitude inflow side of the storm. The overhang consists of precipitation particles diverging from the storm's summit that descend as they are carried downwind. If the storm echo develops a bounded weak-echo region, it is found within the echo overhang.
echo powerThe electrical strength, or power, of the echo received by a radar, normally measured in decibels relative to a milliwatt (dBm). See radar equation.
echo pulseA pulse of radio energy received at a radar after reflection from a target; that is, the target signal of a pulsed radar.
echo signalSame as target signal.
echo sounderA device that uses sound waves to measure the depth of surface water bodies.
echoIn radar, a general term for the appearance, on a radar display, of the radio signal scattered or reflected from a target. The characteristics of a radar echo are determined by 1) the waveform, frequency, and power of the incident wave; 2) the range and velocity of the target with respect to the radar; and 3) the size, shape, and composition of the target. See also target signal, blip.
eclipticThe great circle in the celestial sphere that is the apparent annual path of the sun around the earth. The plane in which this circle lies is the plane of the ecliptic. The angle that this plane makes with the plane passing through the earth's equator is the obliquity of the ecliptic. With reference to the actual motion within the solar system, the plane of the earth's orbit is equivalent to the plane of the ecliptic. That is, the intersection of the plane of the earth's orbit with the earth's surface is the same as the projection of the ecliptic upon the earth's surface. The most northern and southern points on this line of intersection define the latitudes of the Tropic of Cancer and Tropic of Capricorn, respectively. See solstice, equinox; compare zodiac.
ecnephiasA squall or thunderstorm in the Mediterranean
ecoclimatologySame as ecological climatology.
ecological climatology(Also called ecoclimatology.) A branch of bioclimatology that studies the relations between organisms and their climatic environment. It includes the physiological adaptation of plants and animals to their climate, and the geographical distribution of plants and animals in relation to climate.
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