Adjective:

சூரிய உதயம் சார்ந்த,

auroral's Usage Examples:

Azimuths were also measured at Jan Mayen for 338 auroral bands, the mean being 22.

If an auroral arc represented a definite selfluminous portion of space of small transverse dimensions at a uniform height above the ground, its height could be accurately determined by observations made with theodolites at the two ends of a measured base, provided the base were not too short compared to the height.

- The frequency of auroral displays is much greater in some years than others.

2 The mean sun-spot frequencies in the two periods differ by only I %, but the auroral frequency in the later period is 45% in excess of that in the earlier.

In addition to these, he mentions other auroral lines as very probably krypton lines, but in their case the wave-lengths which he quotes from Paulsen (22) are given to only three significant figures, so that the identification is more uncertain.

The mean sun-spot frequency for the group of years of few sun-spots is almost exactly the same for the two subperiods, but the auroral frequency for the later group is nearly 40% in excess of that for the earlier, and even exceeds the auroral frequency in the years of many sun-spots in the earlier sub-period.

We present evidence for the observation of high aspect angle HF radar backscatter from the auroral electrojets.

If a very long base is taken, it becomes increasingly open to doubt whether the portions of space emitting auroral light to the observers at the two ends are the same.

Rubenson (14), from whom Tromholt derives his data for Sweden, seems to accept this view, assigning the apparent increase in auroral frequency since 1860 to the institution by the state of meteorological stations in 1859, and to the increased interest taken in the subject since 1865 by the university of Upsala.

Sunlight is not the only disturbing cause in estimates of auroral frequency.

Very elaborate observations have been made during several Arctic expeditions of the azimuths of the summits of auroral arcs.

In some cases changes of intensity take place round the auroral zenith, simulating the effect that would be produced by a cyclonic rotation of luminous matter.

Synonyms:

aurorean,

Antonyms:

None