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Geophysics III / Geophysik III - Part I / Teil I (Paperback, Softcover reprint of the original 1st ed. 1966)
Loot Price: R2,950
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Geophysics III / Geophysik III - Part I / Teil I (Paperback, Softcover reprint of the original 1st ed. 1966)
Series: Geophysik / Geophysics, 10 / 49 / 1
Expected to ship within 10 - 15 working days
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0 apparent decrease from the 56 Degrees - 58 Degrees zone to the 58
Degrees -60 zone is due to the lack of data in that region. The
lower diagrams seem to indicate that the number of auroras seen in
the northermost region (58 Degrees -60 Degrees) varies relatively
little throughout the year, but at lower latitudes during
equinoctial periods the belt in which overhead auroras are seen
becomes, on the average, broad. Such a study must be supplemented
in the future, particularly in the regions to the north of gm lat.
58 Degrees, by all-sky camera data. d) Sunspot cycle. It has long
been suggested that the main belt of auroras contracts during
periods of low sunspot number; and conversely, at times of large
sunspot number, the radius of the main belt is enlarged, moving
towards lower gm latitudes. Observing auroras at a station to the
south of the (northern) auroral zone, the appearance frequency of
auroras increases with increase of the sunspot number (d. MEINEL,
NEGAARD and CHAMBERLAIN 1954 [50J; see also Sect. 32a and Fig. 51).
However, no detailed study of the sunspot cycle variation of the
auroral distribution has yet been made in any systematic way. It is
expected that iso auroral diagrams will be constructed from data
obtained during the I QSY, which will enable us to compare them
with the IGY isoauroral diagrams, such as that produced by
FELDSTEIN and SOLOMATINA (1960 [18J). SO far, the information
available on this subject is fragmentary.
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