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Of or pertaining to the sun.

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PASSIVE SOLAR SYSTEM

A solar heating or cooling system that operates by using gravity, heat flows, or evaporation rather than mechanical devices to collect and transfer energy.

MICHAELSON ACTINOGRAPH

A pyrheliometer of the bimetallic type used to measure the intensity of direct solar radiation; the radiation is measured in terms of the angular deflection of a blackened bimetallic strip which is exposed to the direct solar beams.

HEMISPHERICAL PYRHELIOMETER

An instrument for measuring the total solar energy from the sun and sky striking a horizontal surface, in which a thermopile measures the temperature difference between white and black portions of a thermally insulated horizontal target within a partially evacuated transparent sphere or hemisphere.

HELIOSTAT

A clock-driven instrument mounting which automatically and continuously points in the direction of the sun;it isused with a pyrheliometer when continuous direct solar radiation measurements are required.

HEAT GAIN

The increase of heat within a given space as a result of direct heating by solar radiation and of heat radiated by other sources such as lights, equipment, or people.

HELIOCENTRIC PARALLAX

The difference in the apparent direction or positions of a celestial body outside the solar system, as observed from the earth and sun. Also called STELLAR PARALLAX, ANNUAL PARALLAX

INSOLATION

Solar radiation received, or the rate of delivery of such radiation.

IONIZED LAYERS

Layers of charged particles existing in the upper reaches of the atmosphere as a result of solar radiation.

IONOSPHERIC STORM

An ionospheric disturbance characterized by wide variations from normal in the state of the ionosphere, such as turbulence in the F-region, absorption increase, height increase, and ionization density decreases. The effects are most marked in high magnetic latitudes and are associated with abnormal solar activity.

IONOSPHERIC DISTURBANCE

A sudden outburst of ultraviolet light on the sun, known as a SOLAR FLARE or CHROMOSPHERIC ERUP- TION, which produces abnormally high ionization in the region of the D-layer. The result is a sudden increase in radio wave absorption, with particular severity in the upper mediu

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