olar scientists are getting an eyeful this summer-more than they had ever hoped for. Their sensitive solar instruments on board Skylab are clicking away in unison like finely tuned machines. (Such flawless performance is not guaranteed on any space mission let alone on a patched-up space station.) resulting photographs of sun have a clarity and resolution never before achieved. And that monstrous, churning, ever-changing ball of gas spewing out enough energy to feed a solar system (SN: 1/27/73, p. 61) is turning out to be much inore complex than they ever imagined. After only two months of looking through telescopes' eyes at some 40,000 pictures of their favorite star, scientists sit knee-deep in unanalyzed data, speak of mind-boggling phenomena and structure, and confess they don't know what it all means-yet. But answers about how sun works are all there just awaiting discovery, and they know it. sun is full of mystery, true teaser of science. six telescopes in orbit photograph sun simultaneously over a broad range of electromagnetic spectrum (the first time this has been done). photographs reveal features on sun only hinted at before from rocket flights and ground based studies: features in corona (the hot, thin outer atmosphere), transition region, chromosphere (the lower atmosphere) and photosphere (the surface). corona has yielded some of biggest surprises. Before Skylab, most scientists studying corona called it quiet, homogeneous outer layer of atmosphere. No more. The quiet homogeneous corona doesn't exist anymore, says Giuseppe A. Vaiana of American Science and Engineering. Robert MacQueen of High Altitude Observatory in Boulder agrees. see changes-dramatic, large-scale changes day by day and even orbit by orbit. We are impressed with bewildering array of structure. corona is a dynamic beast. photographs reveal clearly for first time whole range of coronal features, from intensely active regions to weakest bright points, filament boundaries and limb brightening in coronal holes. But most impressive scenes in corona are ribbon-like structures that look like piles of spaghetti. These are magnetic fields believed to trigger much of sun's spectacular events. fields themselves cannot be seen. But plasma that follows field lines can. These looped features, says Vaiana, emphasize .that major force controlling and shaping corona are magnetic fields. ribbons change with time, both in shape and in spectrum (what frequencies of light they emit). This was a surprise. For decades we've been looking at magnetic fields during flares and fields never seemed to says Goetz Oertel, chief of solar science at NASA headquarters. Not only do fields change, they sometimes change drastically. During a flare they may get unstable, blow up or combine. larger ribbons become prominences that arch for hundreds of kilometers out in corona. (See related story on Aug. 10 prominence, page 123.) On other hand, during June 15 flare (SN: 6/23/73, p. 402), changes were not large-scale at all. 'The increase of surface brightness registered during event [flare], from its moment of triggering to its peak, was in excess of a thousand, says Vaiana. But the resulting structural changes in region which flared are minimal in comparison with those shown previously. This indicates that N