Subject: Re: HIGH CADENCE IMAGING CAMPAIGN Date: Tue, 30 Apr 2002 18:24:58 +0800 (CST) From: Yan Yihua To: Richard Canfield Dear Prof. Canfield, I understand you already summarized a list for the campaign but our solar radio spectro-polarimeters in 1-2 GHz, 2.6 - 3.8 GHz and 5.2 -7.6 GHz ranges observe the sun daily with 5ms, 8ms and 5 ms temporal resolution and 10-20 MHz spectral resolution for burst data and all with 0.2 sec temporal resolution for whole day data. So I would like to let you know our instruments. > > 1. What field of view can you observe at this cadence? (RHESSI sees the > full Sun, but we presume that observations will be aimed at a specific > active region chosen by the Max Millennium Chief Observer) full disk observation (so no spatial resolution) > > 2. What spectral bandpass(es) can you observe? (RHESSI's bandpass is > limited by both detector response and source strength but usually covers > from 3 keV to 17 MeV. Thus, it is interesting to make observations over > a broad range of flare sizes from small soft X-ray B and C flares to M > and X gamma-ray flares). in Radio band: 1-2 GHz, 10 MHz frequency resolution, 5 ms temporal resulution (up-grading now); 2.6-3.8 GHz, 10 MHz frequency resolution, 8 ms temporal resulution; 5.2-7.6 GHz, 20 MHz frequency resolution, 5 ms temporal resulution. for burst data and for whole day data with 0.2 sec temporal resolution. > > 3. In what UT time range and seasons can you observe? (RHESSI > observations are continuous, interrupted only by night in Low-Earth > Orbit and SAA). 23 UT - 9 UT in summer & 0 - 8 UT in winter > > 4. Can you participate in a Target-of-Opportunity campaign at very short > notice, or must we pick a fixed schedule? (RHESSI would welcome > collaborators in either campaign mode, since both have unique advantaqes > and disadvantages). Yes, we can. We have whole day observations. > > 5. If we must pick a fixed schedule, how far in advance must fixed dates > be chosen (RHESSI requires no advanced notice since it is expected to be > continuously operating in the same near-autonomous mode.) > We can observe the sun every day. So no special arrangement is needed. > Of course, we are interested in non-imaging data at high cadence and > lower-cadence imaging data as well, but in response to this message I > would most urgently like to hear about the high-cadence imaging > discussed above. > I understand the above situation and I already prepared our observations, e.g. for the April 21, 2002 flare event in our web site: http://srg.bao.ac.cn/data/pictures2638/2002/April/21/ for the whole day temporal profile & spectra images, as well as many interested fine radio strctures near 3 GHz during the flare period. Thanks for your consideration and best regards, Yihua Yan