Purpose of the flight and payload description
The instrument was composed of two co-aligned hard X-ray detector systems: a 300 cm2 NaI/CsI phoswich scintillator and a 50 cm2 array of four 1.3 cm thick planar germanium detectors. Both detector systems had graded Z passive collimators which defined 2,6º x 5,2º fields of view. The actively shielded germanium array provided ~ 1 keV energy resolution from 13 to 600 keV.
In the phoswich scintillator, background rejection was provided by anticoincidence between the front NaI and the rear CsI, using pulse shape discrimination techniques.
Details of the balloon flight
Balloon launched on: 6/27/1980 at 12:22 utc
Launch site: Columbia Scientific Balloon Facility, Palestine, Texas, US
Balloon launched by: National Scientific Balloon Facility (NSBF)
Balloon manufacturer/size/composition: Zero Pressure Balloon Winzen 821.472 m3 (12.70 microns - Stratofilm) - SF 424.22-050-NSCR-01
Balloon serial number: W29.01-2-01
Flight identification number: 1206P
End of flight (L for landing time, W for last contact, otherwise termination time): 6/27/1980 at 21:47 utc
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): F 10 h 10 m
Landing site: 14 Miles SE of Van Horn,Texas, US
Payload weight: 1037 kgs.
During the flight, several hard X-Ray microflares were detected while the instrument observed the Sun.
- A new component of hard X-rays in solar flares Astrophysical Journal, Part 2 - Letters to the Editor, vol. 251, Dec. 15, 1981, p. L109-L114
- First-order Fermi acceleration in solar flares as a mechanism for the second-step acceleration of prompt protons and relativistic electrons Astrophysical Journal, Part 1, vol. 267, Apr. 1, 1983, p. 433-441
- Flare fragmentation and type III productivity in the 1980 June 27 flare Solar Physics, vol. 130, Dec. 1990, p. 39
- High resolution hard X-ray spectra of solar and cosmic sources Ph.D Thesis by Richard Alan Schwartz
- High resolution X- and Gamma-Ray spectroscopy of solar flares Final Report; 1 Feb. 1979 - 31 Oct. 1983, University of California, Berkeley
- National Scientific Balloon Facility Annual Report FY 1980 National Center for Atmospheric Research, April 1981
- Solar hard X-ray microflares Astrophysical Journal, Part 1, vol. 283, Aug. 1, 1984, p. 421-425
- Two Accelerated Electron Populations in the 1980 June 27 Solar Flare Astrophysical Journal Letters v.417, p.L53
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