auroral


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Related to auroral: auroral oval

auroral

[ə′rȯr·əl]
(astronomy)
The period of dusk before sunrise.
References in periodicals archive ?
This was not the case on Aug 04/05 this year, as the pre-existing NLC remained visible during and after the auroral activity.
analyzed ground-based observations of Jupiter's sodium nebula, which provides an indication of Io's volcanic activity and plasma content in the Io plasma torus, along with satellite-based measurements of radio emission called HOM emission, which is a sign of Jupiter's auroral activity.
The oldest detailed description of auroral displays is found in Norse literature dating to a.
Statistically, Fairbanks averages 243 nights per year of auroral activity," states Professor Neal Brown at the University of Alaska Fairbanks Geophysical Institute.
Sometimes we receive an extra-large flare that causes the auroral oval to expand and reach out further south.
An auroral apparition may appear as a green glow with or without one or more arcs in the northern sky.
Researchers located the sound sources by installing three separate microphones in an observation site where the auroral sounds were recorded.
Caspari in 1883 and more recently set to music by auroral engineer W.
Auroras vary throughout the night during an auroral storm, yet seem best about midnight.
Today the JIRAM (Jovian InfraRed Auroral Mapper) Space spectrometer, developed for NASAs JUNO probe by Leonardo-Finmeccanica, bursts into life, marking the start of the scientific stage of the mission to study the origin and evolution of Jupiter.
Less far-fetched was an 1872 proposal by Pierre de Heen suggesting that, since Venus is much closer to the Sun, auroral activity there must have intensity "the likes of which we can hardly imagine" and that this might account for the ashen light.
But from time to time, as happened this week, we see huge spikes of solar and auroral activity.