scholarly journals Sensitivity to Atypical Tau Initiated Air Showers for a High-Altitude Optical Cherenkov Detector

2019 ◽  
Author(s):  
Austin Cummings ◽  
Roberto Aloisio ◽  
Mario E. Bertaina ◽  
Francesca Bisconti ◽  
Francesco Fenu ◽  
...  
Keyword(s):  
High Altitude ◽  
Cherenkov Detector ◽  
Air Showers

scholarly journals Insulator irradiation damage from extensive air showers in high-altitude areas

AIP Advances ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 115106
Author(s):  
Zhiwei Xu ◽  
Jieqing Fan ◽  
Qiang Zhao ◽  
Jianhong Hao ◽  
Fang Zhang ◽  
...  
Keyword(s):  
High Altitude ◽  
Extensive Air Showers ◽  
Irradiation Damage ◽  
Air Showers

scholarly journals Highlights from HAWC

2019 ◽  
Vol 208 ◽  
pp. 14001
Author(s):  
H. León Vargas
Keyword(s):  
Energy Range ◽  
High Altitude ◽  
High Precision ◽  
Gamma Rays ◽  
Large Data ◽  
Cosmic Ray ◽  
Air Showers ◽  
Data Set ◽  
Sierra Negra Volcano ◽  
Selection Of

The HAWC (High Altitude Water Cherenkov) observatory, located on the slopes of the Sierra Negra volcano in the state of Puebla, Mexico, was designed with the goal of detecting gamma-rays in the Teraelectron- volt energy range. However, most of the air showers that are detected with the observatory, with a rate of ≈ 27 kHz, are of hadronic origin. This makes that, after three years of operations, HAWC has accumulated a very large data set that allows to perform cosmic-ray analysis of high precision. The details of the observatory operation, as well as a selection of recent results in cosmic-ray physics are discussed in this work.

scholarly journals Sensitivity of the high altitude water Cherenkov detector to sources of multi-TeV gamma rays

2013 ◽  
Vol 50-52 ◽  
pp. 26-32 ◽  
Author(s):  
A.U. Abeysekara ◽  
R. Alfaro ◽  
C. Alvarez ◽  
J.D. Álvarez ◽  
R. Arceo ◽  
...  
Keyword(s):  
High Altitude ◽  
Gamma Rays ◽  
Cherenkov Detector ◽  
Water Cherenkov Detector ◽  
Tev Gamma Rays

Contrast of Filament Bright Rims

1994 ◽  
Vol 144 ◽  
pp. 365-367
Author(s):  
E. V. Kononovich ◽  
O. B. Smirnova ◽  
P. Heinzel ◽  
P. Kotrč
Keyword(s):  
High Altitude ◽  
Line Profile ◽  
Line Center ◽  
Magnetic Structures ◽  
The Mean

AbstractThe Hα filtergrams obtained at Tjan-Shan High Altitude Observatory near Alma-Ata (Moscow University Station) were measured in order to specify the bright rims contrast at different points along the line profile (0.0; ± 0.25; ± 0.5; ± 0.75 and ± 1.0 Å). The mean contrast value in the line center is about 25 percent. The bright rims interpretation as the bases of magnetic structures supporting the filaments is suggested.

Clean Electron Microscope Substrate Films Used for Micrometeorite Collection and Study

1967 ◽  
Vol 25 ◽  
pp. 366-367
Author(s):  
D. M. Davies ◽  
R. Kemner ◽  
E. F. Fullam
Keyword(s):  
Thin Film ◽  
Electron Microscope ◽  
High Altitude ◽  
Amyl Acetate ◽  
Temperature Variations ◽  
Film Forming ◽  
Film Specimen ◽  
Particulate Contaminants

All serious electron microscopists at one time or another have been concerned with the cleanliness and freedom from artifacts of thin film specimen support substrates. This is particularly important where there are relatively few particles of a sample to be found for study, as in the case of micrometeorite collections. For the deposition of such celestial garbage through the use of balloons, rockets, and aircraft, the thin film substrates must have not only all the attributes necessary for use in the electron microscope, but also be able to withstand rather wide temperature variations at high altitude, vibration and shock inherent in the collection vehicle's operation and occasionally an unscheduled violent landing.Nitrocellulose has been selected as a film forming material that meets these requirements yet lends itself to a relatively simple clean-up procedure to remove particulate contaminants. A 1% nitrocellulose solution is prepared by dissolving “Parlodion” in redistilled amyl acetate from which all moisture has been removed.

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