COMPTEL, the imaging gamma‐ray telescope, capable of detecting gamma rays in the range of 0.1–30 MeV, is one of four instruments aboard NASA’s Compton Gamma‐Ray Observatory. The Comptel burst detectors (single Defector Mode) have a field of view of ∼2.5 π sr. These detectors of COMPTEL permit measurements of energy spectra and time histories of solar flare gamma‐ray emission. A search through the Single Detector Mode’s data is being conducted. We summarize the preliminary results of this search

Bennett, K

Bloemen, H

Diehl, R

Forrest, D J

Hanlon, L O

Hermsen, W

Lichti, G G

McConnell, Mark L

Rank, G

Ryan, James M.

Schonfelder, V

Strong, A W

Suleiman, R

Swanenburg, B

Varendorff, M

Winkler, C

English

UNH Scholars' Repository

University of New HampshireUniversity of New Hampshire Scholars' RepositorySpace Science Center Institute for the Study of Earth, Oceans, and Space(EOS)1994COMPTEL’s solar flare catalogR SuleimanUniversity of New Hampshire - Main CampusD J. ForrestUniversity of New Hampshire - Main CampusMark L. McConnellUniversity of New Hampshire - Main Campus, mark.mcconnell@unh.eduJames M. RyanUniversity of New Hampshire, James.Ryan@unh.eduR DiehlMax-Planck-Institut für extraterrestricheSee next page for additional authorsFollow this and additional works at: https://scholars.unh.edu/sscPart of the Astrophysics and Astronomy CommonsThis Conference Proceeding is brought to you for free and open access by the Institute for the Study of Earth, Oceans, and Space (EOS) at University ofNew Hampshire Scholars' Repository. It has been accepted for inclusion in Space Science Center by an authorized administrator of University of NewHampshire Scholars' Repository. For more information, please contact nicole.hentz@unh.edu.Recommended CitationCOMPTEL’s solar flare catalog Suleiman, R. and Forrest, D. and McConnell, M. and Ryan, J. and Diehl, R. and Lichti, G. and Rank, G.and Schönfelder, V. and Strong, A. and Varendorff, M. and Bennett, K. and Hanlon, L. and Winkler, C. and Bloeman, H. and Hermsen,W. and Swanenburg, B., AIP Conference Proceedings, 294, 51-54 (1994), DOI:http://dx.doi.org/10.1063/1.45199AuthorsR Suleiman, D J. Forrest, Mark L. McConnell, James M. Ryan, R Diehl, G G. Lichti, G Rank, V Schonfelder, AW. Strong, M Varendorff, K Bennett, L O. Hanlon, C Winkler, H Bloemen, W Hermsen, and B SwanenburgThis conference proceeding is available at University of New Hampshire Scholars' Repository: https://scholars.unh.edu/ssc/167COMPTEL’s solar flare catalogR. Suleiman, D. Forrest, M. McConnell, J. Ryan, R. Diehl, G. Lichti, G. Rank, V.Schönfelder, A. Strong, M. Varendorff, K. Bennett, L. Hanlon, C. Winkler, H.Bloeman, W. Hermsen, and B. Swanenburg  Citation: AIP Conference Proceedings 294, 51 (1994); doi: 10.1063/1.45199 View online: http://dx.doi.org/10.1063/1.45199 View Table of Contents:http://scitation.aip.org/content/aip/proceeding/aipcp/294?ver=pdfcov Published by the AIP Publishing  Articles you may be interested in OSSE observations of the 4 June 1991 solar flare AIP Conf. Proc. 294, 15 (1994); 10.1063/1.45214  Observations of the 1991 June 11 solar flare with COMPTEL AIP Conf. Proc. 294, 100 (1994); 10.1063/1.45207  Neutron and gammaray measurements of the solar flare of 1991 June 9 AIP Conf. Proc. 294, 89 (1994); 10.1063/1.45205  COMPTEL observations of gammaray flares in October 1991 AIP Conf. Proc. 294, 55 (1994); 10.1063/1.45200  Xray and gammaray observations of solar flares by GRANAT AIP Conf. Proc. 294, 3 (1994); 10.1063/1.45197   This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at:http://scitation.aip.org/termsconditions. Downloaded to  IP:  132.177.229.79 On: Mon, 24 Nov 2014 17:42:10COMPTEL 'S  SOLAR FLARE CATALOG R.Sule iman,D.Forrest ,M.McConnel l , J .Ryan University of New Hampshire,Space Science Center,Durham, NH 03824 R.Diehl ,G.L icht i ,G.Rank,V.Sch~nfelder ,A.Strong,M.Varendorf f  1 Max-Plank Institut for Extraterrestr ische Physik, D-8046 Garching, FRG K.Bennett ,L .Hanlon,C.Winkler  Space Science Department of ESA/ESTEC,2200 AG Noordwijk, The Netherlands H.Bloeman,W.Hermsen,B.Swanenburg SRON Leiden, P.B. 9504, NL-2300 RA Leiden, The Netherlands i Currently at University of New Hampshire ABSTRACT COMPTEL, the imaging gamma-ray telescope, capable of detect ing gamma rays in the range of 0.1-30 MeV, is one of four  ins t ruments  aboard  NASA's  Compton  Gamma-Ray  Observatory.  The Comptel burst detectors (single Detector  Mode) have a field of view of ~2.5K sr. These detectors of COMPTEL permit  measurements  of energy spectra and t ime h is tor ies  of solar f lare gamma-ray  emiss ion.  A search through the Single Detector Mode's data is being conducted. We summarize the prel iminary results of this search. INTRODUCTION The COMPTEL Solar Flare Catalog was obtained using the data generated  in the s ingle detector  mode. The BATSE tr igger flare list was used as the primary reference source. This cata log includes almost every t r igger  in the Burst Processor .  The par t i cu la r  in tens i ty  th resho ld  of solar flares needs no defining. The data from the high range of the Single Detector  Mode (June 1991 to February 1992) has been processed and thirty flares have been confirmed. For each processed  flare, energy spect rum and several  t ime history plots, were produced for d i f ferent energy bands. Such plots include (0.6-1) MeV for the 0.847 MeV line from 56Fe, (2-2.4) MeV for the 2.223 MeV l ine from neutron capture on hydrogen, (3-7) MeV for the 4.44 and 6.13 MeV lines due to 12C and 160 deexcitat ion,  and f inal ly  (8-10) MeV. BURST DETECTOR The imaging Compton Telescope, COMPTEL, uses 2 out of the 14 NaI cel ls  in the lower (D2) detector  (Fig. i) to accumulate burst spectra upon receiving a tr igger signal 9 1994 American Institute of Physics 51  This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at:http://scitation.aip.org/termsconditions. Downloaded to  IP:  132.177.229.79 On: Mon, 24 Nov 2014 17:42:1052 COMPTEL's Solar Flare Catalog Figure I. Schemat ic  v iew of the COMPTON te lescope COMPTEL .  The  burs t  detectors  are shaded in black. from BATSE. Each NaI(TI) crystal  of the Single Detector Mode has a diameter of 28 cm, and a height of 7.5 cm. Each is v iewed from below by 7 photomult ip l iers .  The two modules measure energy in two di f ferent ranges: low range (0.i MeV to -0.6 MeV) and high range (-0.6 MeV to ~10.7 MeV) . The thresho ld  (0.I MeV) in the low range is most ly  due to the absorpt ion of gamma-rays in the veto  domes and the a luminum sandwich  p late  she l te r ing  the (D2) assembly (see Fig. I). The detector  modu les  are supp l ied  wi th  ded icated  ADC's  and an e lec t ron ic  subsystem (Burst  Spectrum Analyzer 'BSA') 1 DATA and  ANALYS IS  An extensive search is being conducted in the data of the BSA. If a tr igger is found, then it is cross checked with BATSE and GOES data, to determine if it is a flare. If such a f lare shows good stat is t ics  then further  analys is  is performed.  The method of f inding the background-subtracted flare is to subtract the average of 15 orbits before and after each flare. In the first analysis  only  the f lares  w i th in  the f ie ld of v iew of COMPTEL  te lescope mode were processed, but by tak ing advantage of the wider f ie ld of the single detector  mode other f lares were found. Approximately  30 flares were found and 26 flares have been excluded due to poor statistics. RESULTS In f igure 2 we display the raw time prof i les of 5 solar flares (not dead time corrected). r~ o June 11th Flore - COMFT~L F~S Doto . . . .  I . . . .  I . . . .  I . . . .  7era ~ line n ~ m  Oct. 27th Florlz - COMPTEL PBS Doto H' h Range L; h tcu~ Stort : B556 162068255 Int t;mu 2(~2.0400 - 1f)1 I emP- ~oP-  oP- -~  2.mxlo" Z.~xlO" ~tOxlO" ~1S.10 ( =Jo~lo " . . m   This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at:http://scitation.aip.org/termsconditions. Downloaded to  IP:  132.177.229.79 On: Mon, 24 Nov 2014 17:42:10R. Suleiman et al. 53 Oct. 27th Rore - GOMPff.L PB~ OCto Oct ~h Flora - COMPTEL PBS Doto x;~ 157 I=p . . . . . . .  , . . . .  , . . . .  , . . . .  , . . . .  . z~ I -1 (  July 02th  Flare - COMPTEL PBS Dotg H~X ~ Ronqe Uqhtcu~,  $!ort .: .8439 563597440 ,nt time . 847.1240 . -  . 139 s p e c t r o  -2C 7.C~x '7.0El 104 x , I , , , I z , , I z , z I~ 7.08xl04 7.10x104 7.12x104 7.1 Figure 2. Time prof i les  of 5 solar f lares detected in COMPTEL's burst mode. The first one includes the flare with the background, the middle lines are the background before and after and their average, and the flare minus background. Jun4 | l th  FIo~ - COMPT[L PBS Dam H~gh a~e,'~)ctro 5urn Start; 8418 557017921~t tTmu 900.0000- 741 ~tr  9 . . . , 9 . , 9 . . , . . . , 9 . , 9 . . ~,I  . . . . . . . . .  , . . . . . . . .  o z 9 a I= ( , , , ,w  ~ Oct- 27th flare - COMPTEL PBS Dae.o Figure 3. Energy spectra of solar flares. Top plot is the flare with background while the bottom is the flare minus the background. We show some of the processed solar flares in Table I. For each flare the onset time and the background subtracted  This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at:http://scitation.aip.org/termsconditions. Downloaded to  IP:  132.177.229.79 On: Mon, 24 Nov 2014 17:42:1054 COMPTEL's Solar Flare Catalog counts in the energy  range of 0.6 to -I0 MeV are given. Table i. Summary  of some of the observed  so lar  f lares Flare Date 12/15/91 Onset time (UT) 18:32:20 Batse Event 2102 Batse's Counts 1.00E+07 Comptel's Counts 8.44E+03 Class M1.4 02 /02 /92  09:05:25 2551 1.36E+06 8.60E+03 M2.8 02 /04 /92  07:53:52 2596 6.65E+04 1.01E+03 C3.7 01 /26 /92  14:50:25 2511 8.39E+04 5.31E+04 C5.3 07/02/91  07/1 7/91 2.54E+07 15.24E+07 19:34:30 684 1.90E+05 5.27E+04 786 06:25:00 M4.6 X1.1 06/04/91  03:37:00 387 1.05E+09 1.61E+06 X12.0 06/09/91  01:39:00 419 6.02E+08 7.15E+04 X10.0 06/11/91  01:56:00 485 8.06E+08 3.49E+05 X12.0 06/30/91  02:55:00 665 1.50E+07 3.21E+05 M5.0 10/07/91 10:14:35 1436 ,4.30E+05 1.65E+03 C9.9 10/14/91 17:33:42 1491 9.50E+06 9.59E+03 M6.6 10/15/91 09:13:20 1498 1.36E+06 1.91E+04 C7.7 10/24/91 02:36:21 1551 6.54E+07 1.59E+04 X2.1 10/27/91 05:38:20 1648 4 .29E+08 2.06E+06 X6.1 10/27/91 02:07:30 1643 3 .40E+07 1.29E+05 X1.9 10/30/91 06:18:20 1723 7.13E+07 1.76E+05 X2.5 10/30/91 19:11:42 1743 7.30E+06 2.30E+04 M4.3 10/30/91 22:24:10 1749 2.70E+05 1.24E+04 C5.3 SUMMARY Th is  paper  repor ts  on the pre l iminary  resu l t s  of the  const ruct ion  of the COMPTEL  So lar  F la re  Cata log.  The data  presented  in th is  paper  are f rom the COMPTEL  burs t  mode. Resu l ts  f rom spect ra l  s tud ies  and neut ron  ana lys i s ,  f rom COMPTEL 's  te lescope  mode, for some of the f lares in June and October  of 1991, can be found in these proceedings2,  3. REFERENCES i. Wink ler ,C . ,  et. al, Adv. Space Res. ~, 113 (1986) 2. McConnel l ,  et al. , 1992, COMPTEL observat ions  of solar  f lare gamma-rays,  COSPAR E .3 -S .5 .06 . ( in  press) 3. Rank, G., et al. , 1992, Observat ions  of the 1991 June ii so lar  f lare wi th  COMPTEL, COMPTON Symposium, Wash ington  Univers i ty ,  St. Louis, (October 1992) (AIP conference,  in press)  This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at:http://scitation.aip.org/termsconditions. Downloaded to  IP:  132.177.229.79 On: Mon, 24 Nov 2014 17:42:10

COMPTEL’s solar flare catalog

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COMPTEL’s solar flare catalog

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