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Glossário de Termos Científicos
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It is the GPS frequency at 1.57542 GHz.
Satellite orbit around the L1 Lagrange point. Also known as L1 Lissajous.
It is the GPS frequency at 1.2276 GHz.
Lagrange points are locations in space where gravitational forces and the orbital motion of a body balance each other. There are five Lagrangian points in the Sun-Earth system and such points also exist in the Earth-Moon system.
Energy released or absorbed by a substance during a change of state (phase transition), which occurs without changing its temperature.
The location north or south in reference to the equator, which is designated at zero (0) degrees. Lines of latitude are parallel to the equator and circle the globe. The North and South poles are at 90 degrees North and South latitude.
In a magnetically bipolar or multipolar sunspot group, the western part precedes and the main spot in that part is called the leader.
In atmospheric electricity terms, it is a weak luminous self propagating - electrical discharge creates the channel of lightning discharge
A method where a polynomial approximation is chosen to relate to a given function in way that minimizes the squares of the errors. Used for data smoothing and approximating in differentiation.
Observed in white light, a bright tongue or streaks penetrating or crossing sunspot umbra. The appearance of a light bridge is frequently a sign of impending region division or dissolution.
Distance measured unit which correspond to the distance covered by light in one year.
It is an electrical discharge in atmosphere.
In Solar-Terrestrial terms, it is the edge of the solar disc.
It is the rigid, rocky outer layer of the Earth, consisting of the crust and the solid outermost layer of the upper mantle. It extends to a depth of about 100 km. It is broken into about a dozen separate, rigid blocks, or plates (tectonics plate).
It is time correspondent to local meridian.
The location east or west in reference to the Greenwich Meridian, which is designated as zero (0) degrees longitude. The distance between lines of longitude are greater at the equator and smaller at the higher latitudes, intersecting at the Earth's North and South Poles. Time zones are correlated to longitude.
An arch of high-temperature gas that forms above the Sun's limb after the eruption of a large solar flare, and in which gas drains down to the solar surface. A loop prominence system is a set of such features.
In the ionosphere it refers to the removal of free electrons from the ionosphere.
In plasma physics terms, it is a cone in the velocity space of particles in a plasma confined by magnetic mirrors. Particles with velocities in the cone are not trapped by the mirrors and are lost out of the system.
It is defined as an orbit close to the Earth which extends from the surface up to an altitude of 2,000 kilometers.
The portion of the radio frequency spectrum from 30 to 300 kHz.
That geographic region of the Earth that lies between the equator and the tropics.
SEE Low Earth Orbit.
The smallest decile, one of nine, that has 90% of the ordered values above it.
SEE Optimum Working Frequency.
The lowest frequency which allows an acceptable grade of HF service. Unlike the ALF, the LUF is dependent on the system parameters..
Density fluctuations of the ionospheric plasma that propagate as wavelike structures with periods of 30-60 minutes to several hours.
The interval between two successive transits of the moon's center over the same meridian. Unlike a 24-hour solar day, a lunar day lasts 24 hours and 50 minutes. This occurs because the moon revolves around the Earth in the same direction that the Earth is rotating on its axis.
A lunar month is the amount of time it takes for the Moon to pass through each of its phases (new moon, half, full moon), and then return back to its original position. It takes 29 days, 12 hours, 44 minutes and 3 seconds for the Moon to complete one lunar month.
Hydrogen line emission at 121.6nm wavelength and that is present in solar spectrum. It is important for ionosphere formation.
Hydrogen line emission at 102.6nm wavelength and that is present in solar spectrum. It is important for ionosphere formation.