Close to the cross-sectional center of the nickel iron layer, the spin wave forms a sort of knot, inside of which the magnetic direction
oscillates only up and down rather than along its usually circular trajectory.
For example, evidence from honeybees that approach novel environments from a fixed magnetic direction
suggests that magnetic cues may help to organize spatial behaviour, possibly by standardizing the vantage point for retinotopic maps in unfamiliar habitats (Collett & Baron 1994).
The two permanent magnets, called targeting magnets, are fixed on the flexible thin film in the same magnetic direction
, as shown in Figure 2(b).
According to FAA Order 8260.46, Departure Procedure (DP) Program, pilots instructed to maintain runway heading should fly the "magnetic direction
that corresponds with the runway centerline extended, not the painted runway numbers on the runway." Pilots cleared to "fly or maintain runway heading are expected to fly or maintain the published heading that corresponds with the extended centerline of the departure runway (until otherwise instructed by ATC), and are not to apply drift correction."
Among the minimum equipment required for VFR and IFR flying, FAR 91.205 still lists the magnetic direction
indicator as a must-have item.
The depth of penetration of low order harmonic is larger and more than magnetic direction
length, so it is not considered.
What was the magnetic direction
of rocks at the time?
Modern EFIS will display a little arrow showing the wind relative to the airplane and a legend next to it with the magnetic direction
There is a specific mention of a magnetic direction
finder - a compass - around 1040.
The northern zone showed a mean remnant magnetic direction
of [D.sub.m] = 138.1 and [I.sub.m] = + 42.24 (K = 29.21, [[alpha].sub.95] = 7.81) and the southern zone showed a mean remnant magnetic direction
of [D.sub.m] = 158.3 and [I.sub.m] = + 43.9 (K = 33.72, [[alpha].sub.95] = 7.27).
The rocks' magnetic direction
, or "polarity," is preserved.
Such pinning of the magnetic direction
is needed for the functioning of a special structure known as a spin valve, which is used in modern read heads of computer hard disks.