Electron and Ion Distributions at High Latitudes as Measured by the Air Force Polar Orbiting Satellites.

The Royal Air Force Flying College at Manby in Lincolnshire, England, was established in 1949. During a training course lasting one year, experienced pilots and navigators study all aspects of the operation of an aircraft as a weapon of war. Such an all-embracing syllabus calls for a knowledge of air operations, backed by practical experience, in all parts of the world. Those taking part are introduced to some of the problems peculiar to cold-weather operation in high latitudes by a number of summer air exercises in the arctic regions, and by liaison flights in the winter months to Alaska and Canada.

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Navigation on some recent R.A.F. Flights in High Latitudes

Journal of Navigation ◽

10.1017/s0373463300035451 ◽

1953 ◽

Vol 6 (2) ◽

pp. 148-158

Author(s):

D. Bower

Keyword(s):

Air Force ◽

Typical Case ◽

High Latitudes ◽

Royal Air Force ◽

Arctic Regions

It is now seven years since the first R.A.F. polar flight was carried out by Aries, a Lancastrian aircraft from the Empire Air Navigation School; during that period air operations in Arctic regions have become an every day occurrence. This paper describes a series of flights undertaken recently by the Royal Air Force Flying College; it is not intended as a discussion of the special techniques of navigation in high latitudes but merely as an illustration of their application in a typical case.

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Motions of neutral hydrogen at high latitudes

Symposium - International Astronomical Union ◽

10.1017/s0074180900101068 ◽

1967 ◽

Vol 31 ◽

pp. 265-278 ◽

Cited By ~ 1

Author(s):

A. Blaauw ◽

I. Fejes ◽

C. R. Tolbert ◽

A. N. M. Hulsbosch ◽

E. Raimond

Keyword(s):

Surface Density ◽

Velocity Dispersion ◽

Neutral Hydrogen ◽

Hydrogen Gas ◽

High Latitudes ◽

Low Velocity

Earlier investigations have shown that there is a preponderance of negative velocities in the hydrogen gas at high latitudes, and that in certain areas very little low-velocity gas occurs. In the region 100° <l< 250°, + 40° <b< + 85°, there appears to be a disturbance, with velocities between - 30 and - 80 km/sec. This ‘streaming’ involves about 3000 (r/100)2solar masses (rin pc). In the same region there is a low surface density at low velocities (|V| < 30 km/sec). About 40% of the gas in the disturbance is in the form of separate concentrations superimposed on a relatively smooth background. The number of these concentrations as a function of velocity remains constant from - 30 to - 60 km/sec but drops rapidly at higher negative velocities. The velocity dispersion in the concentrations varies little about 6·2 km/sec. Concentrations at positive velocities are much less abundant.

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Long-term Cyclic Variations of Prominences, Green and Red Coronae over Solar Cycles

International Astronomical Union Colloquium ◽

10.1017/s0252921100064496 ◽

2000 ◽

Vol 179 ◽

pp. 201-204

Author(s):

Vojtech Rušin ◽

Milan Minarovjech ◽

Milan Rybanský

Keyword(s):

Emission Lines ◽

High Latitudes ◽

Green Line ◽

Solar Cycles ◽

The South ◽

Coronal Emission ◽

Local Maxima ◽

The North ◽

Cyclic Variations

AbstractLong-term cyclic variations in the distribution of prominences and intensities of green (530.3 nm) and red (637.4 nm) coronal emission lines over solar cycles 18–23 are presented. Polar prominence branches will reach the poles at different epochs in cycle 23: the north branch at the beginning in 2002 and the south branch a year later (2003), respectively. The local maxima of intensities in the green line show both poleward- and equatorward-migrating branches. The poleward branches will reach the poles around cycle maxima like prominences, while the equatorward branches show a duration of 18 years and will end in cycle minima (2007). The red corona shows mostly equatorward branches. The possibility that these branches begin to develop at high latitudes in the preceding cycles cannot be excluded.

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