scholarly journals Molecules in Comets: A Tool to Estimate the Low Energy Cosmic Ray Flux Outside the Solar System?

1987 ◽  
Vol 120 ◽  
pp. 443-445
Author(s):  
Valerio Pirronello
Keyword(s):  
Solar System ◽  
Chemical Species ◽  
Cosmic Ray ◽  
Low Energy ◽  
Chemical Modifications ◽  
Cometary Nuclei ◽  
First Time ◽  
Cosmic Ray Flux

It is described a method for evaluating the low energy cosmic ray flux outside the heliosphere. It is based on the chemical modifications induced in cometary nuclei by impinging ions and on the release of synthesized chemical species by comets entering for the first time into the inner solar system.

A New Determination of Muon Directional Coupling Coefficients

1968 ◽  
Vol 1 (4) ◽  
pp. 154-157
Author(s):  
D. J. Cooke ◽  
A. G. Fenton
Keyword(s):  
Cosmic Rays ◽  
Solar System ◽  
Cosmic Ray ◽  
Accurate Information ◽  
Coupling Coefficients ◽  
The Earth ◽  
Directional Coupling ◽  
Cosmic Ray Flux ◽  
Primary Cosmic Rays

Primary cosmic rays passing through the solar system carry with them valuable information about solar and astrophysical phenomena in the form of intensity and spectral variations. In order that this information be efficiently extracted from observations of the directional cosmic-ray flux at the surface of the Earth, it is essential to have accurate information available to enable the relating of the observed secondary cosmic-ray directions of motion and intensity to those outside the range of the disturbing terrestrial influences.

scholarly journals Cosmic Rays in the Galactic Centre

1980 ◽  
Vol 33 (1) ◽  
pp. 115
Author(s):  
Masato Yoshimori
Keyword(s):  
Energy Density ◽  
Cosmic Rays ◽  
Solar System ◽  
Molecular Clouds ◽  
Cosmic Ray ◽  
High Energy ◽  
Galactic Centre ◽  
Centre Region ◽  
Cosmic Ray Flux

The cosmic ray flux in the galactic centre region is predicted from the observed data for high energy y rays, y-ray lines and massive molecular clouds. The predicted cosmic ray fluxes above 1 GeVand below 100 MeV are two and four orders of magnitude respectively larger than the value in the neighbourhood of the solar system. The corresponding energy density of cosmic rays is estimated to be 100 eV cm- 3 ? Such a concentrated stream of cosmic rays could accelerate the dense and massive molecular clouds by transfer of their momentum.

scholarly journals ON THE SHORT-TERM PROGNOSIS OF ANTICYCLONIC FORMATIONS IN VILNIUS BY THE HARD COSMIC RAY FLUX VARIATIONS / TRUMPALAIKĖ ANTICIKLONŲ FORMAVIMOSI TIES VILNIUMI PROGNOZĖ PAGAL KIETOSIOS KOSMINĖS SPINDULIUOTĖS SRAUTO SVYRAVIMUS / О КРАТКОВРЕМЕННОМ ПРОГНОЗЕ АНТИЦИКЛОНИЧЕСКИХ ОБРАЗОВАНИЙ В Г. ВИЛЬНЮСЕ ПОКОЛЕБАНИЯМ ПОТОКА ЖЕСТКОГО КОСМИЧЕСКОГО ИЗЛУЧЕНИЯ

2011 ◽  
Vol 19 (3) ◽  
pp. 234-243 ◽  
Author(s):  
Dmitrijus Styro ◽  
Jovita Damauskaitė ◽  
Aleksej Beliajev
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Atmospheric Pressure ◽  
Cosmic Ray ◽  
Gamma Spectrometer ◽  
Short Term ◽  
Time Intervals ◽  
Hard Cosmic Ray Flux ◽  
First Time ◽  
Cosmic Ray Flux

Measurements and analyses of variations of the hard cosmic ray flux (HCRF) were carried out in the energy range 1.2–1.6 MeV in Vilnius in 2002–2005, using gamma-spectrometer. The predictive connection between increase of HCRF and atmospheric pressure in 2–5 days was defined. Investigation of this connection was conducted into a period of time 14–19 h, which was divided into five hourly time intervals: 14–15, 15–16, 16–17, 17–18 and 18–19. For procession of experimental data, the empirical criteria of HCRF increase were suggested. These criteria indicate the HCRF increase in two or more number intervals with a condition of HCRF increase by 15 imp/h or more in every of them next day and total value has to exceed 40 and 50 imp/h. The efficiency of prognosis of atmospheric pressure increase by the increase of HCRF was 62–73% in 2002–2005, using the first criterion (40 imp/h) and 53–67% using the second one (50 imp/h). The illustration of atmospheric pressure formations confirm the results of prognosis of anticyclone transfer, which block the way to the motion of cyclones eastward from the Atlantic Ocean. Hence, the prognostic connection between atmospheric pressure increases in 2–5 days by HCRF increase was defined for the first time. Santrauka 2002–2005 m. gamą spektrometru Vilniuje atlikti 1,2–1,6 MeV energinio intervalo kietosios kosminės spinduliuotės srauto (KKSS) matavimai. Nustatytas prognostinis ryšys tarp KKSS didėjimo ir atmosferos slėgio padidėjimo po 2–5 parų. Tirta laiko intervalas nuo 14 iki 19 h. Rezultatų analizei šis tarpsnis padalytas į penkis laiko intervalus: 14–15, 15–16, 16–17, 17–18 ir 18–19 h. Gautiems duomenims realizuoti praktiškai buvo pasiūlyti dviejų ar didesnio nurodyto laiko intervalų skaičiaus KKSS didėjimo empiriniai kriterijai su sąlyga, kad kiekvieno iš jų KKSS padidėjimas ne mažesnis kaip 15 imp./h, o suminė reikšmė turi viršyti 40 imp./h, arba 50 imp./h. Esant šioms sąlygoms buvo ieškomas koreliacinis ryšys tarp KKSS variacijų ir atmosferos slėgio padidėjimų. Prognozės efektyvumas 2002–2005 m., taikant pirmajį kriterijų (40 imp./h), buvo 62–72%, o taikant antrajį (50 imp./h) mažesnis – 53–67%. Barinių formacijų iliustravimas patvirtina blokuojančių anticiklonų, kurie užtveria kelią nuo Atlanto vandenyno judantiems į rytus ciklonams, judėjimo prognozės rezultatus. Pirmą kartą nustatytas prognostinis ryšys tarp KKSS didėjimo ir atmosferos slėgio padidėjimo po 2–5 parų. Резюме Измерения и анализ вариаций потока жесткого космического излучения (ПЖКИ) проводились в энергетическоминтервале 1,2–1,6 МэВ в г. Вильнюсе в 2002–2005 гг. с помощью гаммаспектрометра. Определялась прогностическая связь между ростом ПЖКИ и увеличением атмосферного давления спустя 2–5 суток. Исследования такой связи проводились ежедневно от 14 до 19 часов. Этот временной диапазон разделялся на пять временных часовыхинтервалов: 14–15, 15–16, 16–17, 17–18, 18–19 час. Для обработки опытных данных предложены эмпирическиекритерии, которые определяют ПЖКИ в двух или большем количестве временных интервалов при условии, чтоего рост в каждом из них на следующие сутки должен быть не менее 15 имп/час, а суммарное значение должнопревышать 40 или 50 имп/час. При этих условиях была установлена корреляционная связь между ростом ПЖКИ иувеличением атмосферного давления, эффективность которой для 2002–2005 гг. оказалась 62–72 % с применением первого критерия (40 имп/час), а при использовании второго эффективность оказалась ниже – 53–67 %. Приведенная иллюстрация барических образований подтверждает результаты прогноза смещения блокирующихантициклонов, которые перекрывают путь циклонам, движущимся в восточном направлении со стороны Атлантического океана. Таким образом, впервые установлена прогностическая связь между возрастанием ПЖКИ и ростом атмосферного давления спустя 2–5 суток.

Upper limit on the low energy interstellar cosmic-ray flux

Nature ◽  
1974 ◽  
Vol 248 (5443) ◽  
pp. 35-36 ◽  
Author(s):  
P. MÉSZÁROS
Keyword(s):  
Cosmic Ray ◽  
Low Energy ◽  
Upper Limit ◽  
Cosmic Ray Flux

Long-term variations in the cosmic-ray flux

1975 ◽  
Vol 277 (1270) ◽  
pp. 395-411 ◽  
Keyword(s):  
Solar System ◽  
Cosmic Ray ◽  
Heavy Nuclei ◽  
Limited Data ◽  
Solid Objects ◽  
Time Period ◽  
Time Variations ◽  
Temporal And Spatial ◽  
Cosmic Ray Flux

The present-day information on the temporal and spatial variations in the flux and chemical composition of cosmic-ray protons and multicharged nuclei during certain intervals of time, since the beginning of the Solar System, is discussed. This information has been deduced on the basis of analyses of isotopic changes and alterations in the crystalline matrix of meteoritic and lunar materials. Most of the samples analysed were exposed to cosmic radiation during the recent time period, 0-10 Ma B.P. and some during 100-1000 Ma B.P. Limited data are also available for the time period soon after the formation of solid objects in the Solar System, i.e. ca . 4500 Ma B.P., based on analyses of certain meteorites. The cosmic-ray parameters deduced are for the 1-3 AU space and are average values for time periods of 105-1 0 7 a for protons, a -particles, v.h./v.v.h. nuclei in the kinetic energy interval (1-1500) MeV/nucleon. The archaic cosmic-ray data provide information on the long term average features of acceleration of protons and heavy nuclei by the Sun and on the relative contributions of solar particles to the total cosmic-ray particle population at 1 AU. The implications of absence of any marked time variations in the flux and energy spectra of protons v.h. (Z ^ 20) andv.v.h. (Z ^ 30) nuclei are discussed briefly in relation to cosmic-ray sources and propagation.

scholarly journals Low energy secondary cosmic ray flux (gamma rays) monitoring and its constrains

2014 ◽  
Vol 355 (2) ◽  
pp. 347-352 ◽  
Author(s):  
Anil Raghav ◽  
Ankush Bhaskar ◽  
Virendra Yadav ◽  
Nitinkumar Bijewar
Keyword(s):  
Gamma Rays ◽  
Cosmic Ray ◽  
Low Energy ◽  
Cosmic Ray Flux

scholarly journals Cosmic ray flux and lockdown due to COVID-19 in Kolkata – Any correlation?

Pramana ◽  
2021 ◽  
Vol 95 (2) ◽  
Author(s):  
A Sen ◽  
S Chatterjee ◽  
S Roy ◽  
R Biswas ◽  
S Das ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Cosmic Ray Flux
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