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This paper provides a short review of some of the basic concepts related to the origin of coronal mass ejections (CMEs). The various ideas which have been put forward to explain the initiation of CMEs are categorized in terms of whether they are force-free or non-force-free and ideal or nonideal. A few representative models of each category are examined to(More)
The ability of the Transition Region and Coronal Explorer (TRACE) to image solar plasma over a wide range of temperatures (–10 7 K) at high spatial resolution (0Љ .5 pixels) makes it a unique instrument for observing 4 T ∼ 10 e solar flares. We present TRACE and Yohkoh observations of an M2.4 two-ribbon flare that began on 1999 July 25 at about 13:08 UT. We(More)
Solar eruptions occur when magnetic energy is suddenly converted into heat and kinetic energy by magnetic reconnection in a current sheet (CS). It is often assumed that CSs are too thin to be observable because the electric resistivity in CSs is taken to be very small. In this work, we show the implications for the CS thickness h e d estimated from(More)
—An analog-to-digital converter (ADC) architecture is described which utilizes mixing instead of high frequency sampling, and folds the input in frequency around harmonics of the mixing local oscillator. The frequency-folded input is separated in the digital domain, which enables significant dynamic range benefits. The frequency of the mixing local(More)
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