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Dynamic Variations at the Base of the Solar Convection Zone
Thompson, M. J.; Howe, R.; Hill, F. +5 more
We have detected changes in the rotation of the sun near the base of its convective envelope, including a prominent variation with a period of 1.3 years at low latitudes. Such helioseismic probing of the deep solar interior has been enabled by nearly continuous observation of its oscillation modes with two complementary experiments. Inversion of t…
Discovery of Gaseous S2 in Io's Pele Plume
Ballester, Gilda E.; McGrath, Melissa A.; Spencer, John R. +2 more
Spectroscopy of Io's Pele plume against Jupiter by the Hubble Space Telescope in October 1999 revealed absorption due to S2 gas, with a column density of 1.0 +/- 0.2 × 1016 per square centimeter, and probably also SO2 gas with a column density of 7 +/- 3 × 1016 per square centimeter. This SO2/…
Seismic Images of the Far Side of the Sun
Braun, D. C.; Lindsey, C.
Images of an active region on the far side of the sun were derived by applying seismic holography to recent helioseismic observations from space. Active regions are the centers of energetic phenomena such as solar flares and coronal mass ejections, whose resulting electromagnetic and particle radiation interfere with telecommunications and power t…
Windows Through the Dusty Disks Surrounding the Youngest Low-Mass Protostellar Objects
Cernicharo, J.; González-Alfonso, E.; Noriega-Crespo, A. +5 more
The formation and evolution of young low-mass stars are characterized by important processes of mass loss and accretion occurring in the innermost regions of their placentary circumstellar disks. Because of the large obscuration of these disks at optical and infrared wavelengths in the early protostellar stages (class 0 sources), they were previou…