Subject: Re: HIGH CADENCE IMAGING CAMPAIGN Date: Tue, 16 Apr 2002 07:22:47 +0000 From: Wolfgang Otruba Organization: Kanzelhoehe Solar Observatory To: Richard Canfield CC: arh@IGAM06WS.uni-graz.at Hi Dick, Kanzelhoehe Solar Observatory, Austria (KSO) can participate in the high cadence campaigns of RHESSI. Find my comments to your request inserted below the relevant lines of your questionaire. Of course we will have to make some tests and some small changes in the control software for the imager systems, but they should be minor...It depends also on the personal situation on a specific date, but in general we can support with full disk observations in Halpha and Na-D. see in detail below and please check also our web-site for details of the instruments: Am Donnerstag, 11. April 2002 04:56 schrieben Sie: > The RHESSI team seeks collaborators at ground-based and space-based > observatories to participate in a High Cadence Imaging Campaign. RHESSI > is capable of making high-quality hard and soft X-ray movies with a > cadence of 2 seconds (half spin) and even down to 10s of ms for intense > events, and seeks collaborators at observatories working in other > spectral bands (H-alpha, radio, EUV, continuum, ...) who can make > observations at similar cadence. > > Please contact me by telephone or e-mail to discuss imaging observations > you can achieve with a temporal cadence of at least 2-4 seconds: > > 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 in both bands > > 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). ........Halpha (0.07nm bandwith), line center and +/- 0.1 nm shifted, cadence 1 image per 2 sec. We are currently calibrating the filter and the shifting, so the given values are estimates. .......Na-D with a MOF, just images with a cadence of about 1 images per 2 sec, but if we want also Dopplergrams and Magnetograms we need 15 to 30 secs depending on the required precision (S/N ratio) > > 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). .......6 to 15 UT in all seasons, all days, may a little bit longer during summer, and 7 to 14 UT during 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). .....both, but see note in next topic > > 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.) .....some days would be sufficient, but we would need some days for preparation for new TOO jobs, then we can activate a special job very quickly. > > 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. > ...best regards and don't hesitate to contact me for further information, Wolfgang I look forward to hearing from you. > > Dick > > Department of Physics E-mail: canfield@physics.montana.edu > Montana State University Telephone: (406) 994-5581 > P.O. Box 173840 Fax: (406) 994-4452 > Bozeman, MT 59717-3840 USA http://solar.physics.montana.edu/canfield > ====================================================================== > FedEx etc: Physics Dept, EPS 264, Montana State Univ, Bozeman MT 59717 > ======================================================================