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Or they can apply theories of atomic and nuclear physics to mysteries of the solar furnace, an approacii that has explained much in recent years. By charting the relation- ships between changes seen on the sun, such as sunspots, and unusual behavior of radio signals, other clues have been made available. Among the most fruitful investigations have been those in which the sun's rim is photographed during an eclipse, producing spectacular and informative pictures of violent solar activity. With optically simulated eclipses (coronagraphs), astronomers have taken many more silhouettes of the sun's outer atmosphere. A neglected approach, however, is examination of the sun "full-face," instead of in profile, and photograph- ing sections of its surface in great detail. It is to this technique that the Rocky Point group is devoting so much of its effort. "Head-on" examination of the sun's surface, thougii not new, is a method virtually dormant for seventy years. In the 1870's the famous French astronomer, Pierre Jules Cesar Janssen, took such pictures and was able to show, for the first time, the granular, cooked-cereal texture of the solar surface. Janssen's classic photographs have appeared in standard texts over the years as the best of their kind. But they were, in many ways, ahead of their time and raised as many astronomical questions as they answered. Smooth Air Aids Observation Speculating on the hiatus of detailed "full-face" solar photography since Janssen's time, Dr. Miller points out that most modern solar observatories have been perched at higher and higher altitudes to take advantage of the increased transparency of the earth's atmosphere. Though these mountaintop sites give many occasions of good viewing of the sun's outer atmosphere —• the corona and chromosphere — they are usually the worst possible locations for seeing the solar disc in great detail. The sun heats the air around the mountain, violent updrafts form and the sun's image dances in an optical instru- ment. In profile at various levels of the sun's atmosphere are some of the phenomena the Rocky Point group are ob- serving In full-face studies of the solar disc (see photo on page 22). The photosphere is the layer visible to the eye; outer zones are more ratified. Both the eruptive flare and jet-like spicules are believed to be near the start of different chains of events that often disrupt long- distance radio communications on earth. Also under scrutiny are granules, which give sun's face a cooked- cereal texture in photographs. RADIO AGE 21 SOLAR INTERIOR