discussing the difficulties involved in linking terrestrial phenomena with solar activity and indicating how resolving that issue could have an impact on our understanding of solar physics
pointing out the futility of a certain line of scientific inquiry into the terrestrial effects of solar activity and recommending its abandonment in favor of purely physics-oriented research
outlining the specific reasons why a problem in solar physics has not yet been solved and faulting the overly theoretical approach of modern physicists
18. Which of the following statements about the two models of solar activity, as they are described in lines 37-55, is accurate?
In both models cyclical solar activity is regarded as a long-lived feature of the Sun, persisting with little change over billions of years.
In both models the solar-activity cycle is hypothesized as being dependent on the large-scale solar magnetic field.
In one model the Suns magnetic field is thought to play a role in causing solar activity, whereas in the other model it is not.
In one model solar activity is presumed to be unrelated to terrestrial phenomena, whereas in the other model solar activity is thought to have observable effects on the Earth.
In one model cycles of solar activity with periodicities longer than a few decades are considered to be impossible, whereas in the other model such cycles are predicted.
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