The Cause Of The Auroras Solar Borealis Astronomy C90 Y/O Trade Ad Card
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The Cause Of The Auroras Solar Borealis Astronomy c90 Y/O Trade Ad Card
NOTE: THESE ARE NOT POSTCARDS THEY ARE TRADE/ADVERTISING CARDS.THEY ARE MUCH SMALLER THAN A STANDARD POSTCARD AND THERE IS ADVERTISING TEXT ON THE BACK!
THE CARD DIMENSIONS ARE APPROXIMATELY 2 5/8 '' x 1 3/8 '' or 6.5 cm. x 3.5 cm.
THIS IS AN ORIGINAL c90 YEAR OLD TRADE ADVERTISING CARD
THE TITLE ON THIS CARD IS:
THE CAUSE OF THE AURORAS
An aurora (plural: auroras), [a] sometimes referred to as polar lights, northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in the Earth's sky, predominantly seen in the high latitude (Arctic and Antarctic) regions.
Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere) due to Earth's magnetic field, where their energy is lost.
The resulting ionization and excitation of atmospheric constituents emits light of varying color and complexity. The form of the aurora, occurring within bands around both polar regions, is also dependent on the amount of acceleration imparted to the precipitating particles. Precipitating protons generally produce optical emissions as incident hydrogen atoms after gaining electrons from the atmosphere. Proton auroras are usually observed at lower latitudes.
NOTE:THE REVERSE SIDE HAS TEXT ABOUT THE IMAGE ON THE FRONT
THE CARD DIMENSIONS ARE APPROXIMATELY 2 5/8 '' x 1 3/8 '' or 6.5 cm. x 3.5 cm.NOTE: THE IMAGE ABOVE IS LARGER THAN THE CARDTO SHOW THE DETAIL.SEE SCALED IMAGE ABOVE.
THIS CARDS IS NOT A MODERN REPRODUCTION THIS CARD IS c90 YEARS OLD
IT IS NOT PERFECT AND THIS CARD MAY HAVESLIGHT PAPER LOSS SMUDGINGROUNDED CORNERS SURFACE CREASESEE THE IMAGES ABOVE!41WE COMBINE SHIPPINGBUY 1 TO 4 TRADE ADVERTISING CARDS AND THE TOTAL TO SHIP IS $2BUY 5 TRADE ADVERTISING CARDS AND SHIPPING IS FREENOTE:ON LARGER INTERNATIONAL ORDERS WE MAY REQUIRE REGISTERDMAIL AND WILL SPLIT THE COST WITH THE BUYER.INQUIRE IF CONCERNED!
The Cause Of The Auroras Solar Borealis Astronomy c90 Y/O Trade Ad Card
NOTE: THESE ARE NOT POSTCARDS THEY ARE TRADE/ADVERTISING CARDS.THEY ARE MUCH SMALLER THAN A STANDARD POSTCARD AND THERE IS ADVERTISING TEXT ON THE BACK!
THE CARD DIMENSIONS ARE APPROXIMATELY 2 5/8 '' x 1 3/8 '' or 6.5 cm. x 3.5 cm.
THIS IS AN ORIGINAL c90 YEAR OLD TRADE ADVERTISING CARD
THE TITLE ON THIS CARD IS:
THE CAUSE OF THE AURORAS
An aurora (plural: auroras), [a] sometimes referred to as polar lights, northern lights (aurora borealis) or southern lights (aurora australis), is a natural light display in the Earth's sky, predominantly seen in the high latitude (Arctic and Antarctic) regions.
Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere) due to Earth's magnetic field, where their energy is lost.
The resulting ionization and excitation of atmospheric constituents emits light of varying color and complexity. The form of the aurora, occurring within bands around both polar regions, is also dependent on the amount of acceleration imparted to the precipitating particles. Precipitating protons generally produce optical emissions as incident hydrogen atoms after gaining electrons from the atmosphere. Proton auroras are usually observed at lower latitudes.
NOTE:THE REVERSE SIDE HAS TEXT ABOUT THE IMAGE ON THE FRONT
THE CARD DIMENSIONS ARE APPROXIMATELY 2 5/8 '' x 1 3/8 '' or 6.5 cm. x 3.5 cm.NOTE: THE IMAGE ABOVE IS LARGER THAN THE CARDTO SHOW THE DETAIL.SEE SCALED IMAGE ABOVE.
THIS CARDS IS NOT A MODERN REPRODUCTION THIS CARD IS c90 YEARS OLD
IT IS NOT PERFECT AND THIS CARD MAY HAVESLIGHT PAPER LOSS SMUDGINGROUNDED CORNERS SURFACE CREASESEE THE IMAGES ABOVE!41WE COMBINE SHIPPINGBUY 1 TO 4 TRADE ADVERTISING CARDS AND THE TOTAL TO SHIP IS $2BUY 5 TRADE ADVERTISING CARDS AND SHIPPING IS FREENOTE:ON LARGER INTERNATIONAL ORDERS WE MAY REQUIRE REGISTERDMAIL AND WILL SPLIT THE COST WITH THE BUYER.INQUIRE IF CONCERNED!
