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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

A sudden increase in the number of atmospherics detected, caused by enhanced reflectivity of ionospheric layers, allowing the radiation from more distant lightning discharges to be received.  1, record 1, English, - sudden%20enhancement%20of%20atmospherics

Record number: 1, Textual support number: 1 OBS

The increased reflectivity arises when a solar flare ejects charged particles that subsequently produce a sudden rise in ionization in the Earth’s upper atmosphere.  1, record 1, English, - sudden%20enhancement%20of%20atmospherics

Record 1,  Textual support,  French

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

The sound that results from the formation of lightning. This burst of lightning expands air around it, producing an effect similar to an explosion, thus creating the noise.  2, record 2, English, - thunder

Record number: 2, Textual support number: 1 CONT

Thunder is the noise caused by the explosive expansion of air due to the heat generated by a lightning discharge. Thunder may have a sharp cracking sound when lightning is close by, compared to a rumbling noise produced by more distant strokes.  3, record 2, English, - thunder

Record number: 2, Textual support number: 2 CONT

Thunder ... moves through the atmosphere at a speed of about one mile in five seconds. To obtain the distance in miles of a lightning bolt, count the number of seconds between flash and thunder, then divide by five.  4, record 2, English, - thunder

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Onde acoustique, se manifestant par un bruit sec ou un roulement sourd, accompagnant un éclair et qui est due à la dilatation brusque de l'air par réchauffement le long du trajet de l'éclair.  2, record 2, French, - tonnerre

Record number: 2, Textual support number: 1 CONT

L'impression auditive de roulement perçue par un observateur à distance a pour origine un phénomène de battement entre les ondes émises tout au long de l'éclair. Le tonnerre peut être entendu jusqu'à environ 25 kilomètres de distance. En raison de la vitesse de la lumière (300 000 kilomètres par seconde) la détection visuelle d'un éclair peut être considérée comme instantanée, alors que le «coup de tonnerre» qui lui est associé se transfère à la vitesse du son, soit approximativement 330 mètres par seconde. Ainsi en divisant par trois l'écart de temps exprimé en secondes entre la perception de l'éclair et l'audition du coup de tonnerre, on obtient une estimation approchée de la distance de l'orage, en kilomètres.  2, record 2, French, - tonnerre

Record 2,  Textual support,  Spanish

Record number: 2, Textual support number: 1 DEF

Ruido que produce un rayo cuando se propaga por la atmósfera.  2, record 2, Spanish, - trueno

Record number: 2, Textual support number: 1 CONT

En el instante que se produce el rayo se origina el trueno. El calor producido por la descarga eléctrica calienta el aire y lo expande bruscamente, dando lugar a ondas de presión que se propagan como ondas sonoras. Cuando esas ondas sonoras pasan sobre el observador, este percibe el ruido denominado trueno. Como la velocidad de la luz es de 300.000 km/s, el relámpago se ve casi al instante en que tiene efecto, pero no ocurre lo mismo con el trueno, ya que el sonido se propaga más lentamente, a unos 300 m/s. Por esto el trueno se oye después de desaparecer el relámpago.  3, record 2, Spanish, - trueno

Record number: 2, Textual support number: 1 OBS

Se debe a la expansión rápida de los gases a lo largo de un canal de descarga eléctrica.  4, record 2, Spanish, - trueno

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

A relatively close lightning strike will almost always appear whitish-yellow. The light from distant lightning can be scattered by air molecules or other particles, which can result in a change in color. This same scattering process is what causes the change of the sun's color when near the horizon.  2, record 3, English, - distant%20lightning

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Éclair apparaissant au loin sans qu'on entende le bruit du tonnerre.  1, record 3, French, - %C3%A9clair%20lointain

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

Atmospheric heard in receivers as a whistle.  2, record 4, English, - whistler

Record number: 4, Textual support number: 1 OBS

Atmospheric... attributed to propagation along the lines of force of the Earth's magnetic field from very distant sources of lightning.  2, record 4, English, - whistler

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 DEF

Parasite atmosphérique faisant entendre un sifflement dans les récepteurs radio.  4, record 4, French, - siffleur

Record number: 4, Textual support number: 1 OBS

Il [parasite] est attribuable à la propagation le long des lignes de force du champ magnétique terrestre de signaux provenant d'éclairs très lointains.  4, record 4, French, - siffleur

Record 4,  Textual support,  Spanish

Record number: 4, Textual support number: 1 DEF

Ruido agudo y continuo producido en los radiorreceptores y amplificadores [...]  2, record 4, Spanish, - silbido

Record number: 4, Textual support number: 1 OBS

silbido: Se atribuye a la propagación, a lo largo de las líneas de fuerza del campo magnético terrestre, de la energía producida por relámpagos muy lejanos.  3, record 4, Spanish, - silbido

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 DEF

Instrument for determining the direction, intensity and frequency of occurrence of atmospherics.  6, record 5, English, - sferics%20recorder

Record number: 5, Textual support number: 1 CONT

Most sferics receivers operated on frequencies around 10 kHz, up to some 50 kHz and down to some 3 kHz being the "classical waveband". ... The reason for this fact is simple. Lightning discharges are by far the most powerful sources of sferics.  7, record 5, English, - sferics%20recorder

Record number: 5, Textual support number: 2 CONT

Sferics receiver ... In its simplest form the instrument consists of two orthogonally crossed antennas. Their output signals are connected to an oscillograph so that one loop measures the north-south component whereas the other measures the east-west component. These are combined vertically to give the azimuth.  8, record 5, English, - sferics%20recorder

Record number: 5, Textual support number: 3 CONT

Each measuring station contains at least one spherics receiver to pick up spherics signals and a transmission device to transfer measuring data available...  3, record 5, English, - sferics%20recorder

Record number: 5, Textual support number: 1 OBS

In most consulted sources, "sferics receiver" and "lightning recorder" are synonyms. However, the Meteorology Glossary of the American Meteorological Society also defines "sferics receiver" as a "type of radio direction finder,... most commonly used to detect and locate cloud-to-ground lightning discharges from distant thunderstorms. "  9, record 5, English, - sferics%20recorder

Record number: 5, Textual support number: 2 OBS

Atmospherics: Also known as "sferics," transient radio waves produced by naturally occurring electric discharges (e.g., lightning) in the Earth’s atmosphere.  10, record 5, English, - sferics%20recorder

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 DEF

Instrument servant à déterminer la direction, l'intensité et la fréquence des atmosphériques.  2, record 5, French, - enregistreur%20d%27atmosph%C3%A9riques

Record 5,  Textual support,  Spanish

Record number: 5, Textual support number: 1 DEF

Instrumento para determinar la dirección, la intensidad y la frecuencia de los atmosféricos.  1, record 5, Spanish, - registrador%20de%20atmosf%C3%A9ricos

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 DEF

A type of radio direction finder, it is most commonly used to detect and locate cloud-to-ground lightning discharges from distant thunderstorms.  2, record 6, English, - lightning%20recorder

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 DEF

Instrument de détermination de la direction, de l'intensité et de la fréquence des éclairs.  3, record 6, French, - enregistreur%20d%27%C3%A9clairs

Record 6,  Textual support,  Spanish