RHESSI & Nobeyama Imaging Observations of the X 2.7 Flare of 2003 Nov 3, 00:58 UT

We describe the RHESSI HXR and Nobeyama (NoRH) microwave imaging observations of an X-class event that was observed during the great solar activity period of Oct 19--Nov 10, 2003. The flare in question of class X 2.7 was observed in AR 0488 (position N08W66) on 2003 Nov 3, 00:58:33 UT, with a large peak at 01:15:25 UT, and ending at 03:08:19 UT. The maximum fluxes at 17 and 34 GHz are respectively 678 and 536 SFU. Besides the peak at 01:15 there are two other peaks at approx 01:20 and 01:32:30 UT. In NoRP data the peak at 01:20 is the most dominant at frequencies 9.40, 3.75, 2.0 GHz. At 1.0 GHz the emission prior to this peak is fluctuating and a peak with fluctuations exists at around 01:05 UT. The third peak at 01:32:30 UT is spiky and it is nonthermal with a turnover frequency between 17 and 34 GHz. One significant property of the HXR emission (below 12 keV) during the period 01:00 - 01:08 is that the preflare emission, in projection, lies close to and above the W-limb, although the associated microwave source is on the disk. There are two preflare sources (RHESSI at 12-25 keV, and NoRH at 17 and 34 Ghz), but it is not clear how they are related. The RHESSI source seems to coincide in position with the EIT flaring source at its apex. The morphological structure seems to suggest that we are dealing with a loop-top HXR source situated at the top of the EIT flaring loop and flaring sources at 17 and 34 GHz, whose morphology suggests a complex flaring arcade structure.