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首页> 美国政府科技报告 >Correlation Lifetimes of Quiet and Magnetic Granulation from the SOUP (Solar Optical Universal Polarimeter) Instrument on Spacelab 2
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Correlation Lifetimes of Quiet and Magnetic Granulation from the SOUP (Solar Optical Universal Polarimeter) Instrument on Spacelab 2

机译：spacelab上sOUp（太阳光学通用偏振仪）仪器的静磁和磁粒的相关寿命2

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The flight of the Solar Optical Universal Polarimeter (SOUP) on Spacelab 2 allowed the collection of time sequences of diffraction limited (0.5 arc second) granulation images with excellent pointing (0.003 arc second jitter RMS) and freedom from the distortion that plagues groundbased images. The solar 5 minute oscillations are clearly seen in the data. Using Fourier transforms in the temporal and spatial domain, we have shown that these dominate the autocorrelation lifetime in magnetic regions. When the oscillations are removed the autocorrelation lifetime is found to be 410 and 890 seconds, respectively, in quiet and magnetic regions. In quiet areas exploding granules are common. It is hard to find that neither explodes nor is unaffected by a nearby explosion. A significant fraction of granule lifetimes are terminated by nearby explosions. Local correlation tracking techniques are used to measure horizontal displacements, and thus transverse velocities, in the intensity field. In quiet sun it is possible to detect both super- and mesogranulation. Horizontal velocities are as great as 1000 m/s quiet sun, and the average velocity is 400 m/s. In magnetic regions horizontal velocities are much less, about 200 m/s. These flows effect the measured lifetime. A lower limit to the lifetime in quiet and magnetic sun is estimated to be 440 and 950 seconds. Keywords: Solar granulation; Solar photosphere; Space physics; Reprints. (JHD)

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