Microwave Neutral Line Associated Source and a Current Sheet

摘要: Neutral Line associated Sources (NLSs) are quasi-stationary microwave sources projected onto vicinities of the neutral line photospheric magnetic field. NLSs often precursors powerful flares, but their nature is unclear. We endeavor to reveal structure an NLS and analyze a physical connection between such source with site energy release in corona above NOAA 10488 (October/November 2003). Evolution this AR includes emergence collision two bipolar structures, rise main separator, appearance underneath. The appears at contact colliding sunspots, whose relative motion goes on, resulting large shear along tangent. Then nascent becomes fluctuations AR. emission 17 GHz dominated by either footpoints or top loop-like structure, loop, which connects sunspots. During considerable amount time, dominates over that footpoint where field stronger. At resembles usual sunspot–associated radio source, brightness center displaced towards periphery sunspot. Microwave X2.7 flare mainly concentrated ascending initially coinciding loop. loop located base non-uniform bar-like visible soft X-rays 34 GHz onset. i) upward lengthening bar before onset, ii) the apparently axis bar, iii) a non-thermal descent was launching coronal ejection. connect probable position nearly vertical diffusion region, maximal inside extended pre-flare current sheet. bottom region. A combination region constitutes skeleton NLS.