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

Author(s):  
Dmitrijus Styro ◽  
Jovita Damauskaitė ◽  
Aleksej Beliajev

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.

Author(s):  
Dmitrijus Styra ◽  
Algirdas Čiučelis ◽  
Ana Usovaitė ◽  
Jovita Damauskaitė

Analysis of hard cosmic ray flux (HCRF) variation at an energy interval 1.2—1.6 MeV was carried out in Vilnius. Connection between HCRF decrease at the mentioned energy interval and the minimum atmospheric pressure in 3–6 days is defined. This phenomenon is registered from 8 up to 13 hours. According to the time interval of HCRF decrease, for instance 8–9 and 9–10 hours, the minimum pressure in Vilnius takes place in 3^1 days, and at time intervals 11–12, and 12–13 hours ‐ in 5–6 days. Realization of this prognosis at one of the presented time intervals was 56–67% in 2002–2003. The same investigation results, with the assumption of atmospheric pressure decrease from 1005 hPa and less, showed a high efficiency of prognosis of the minimum pressure in Vilnius at all the time intervals during 6 days ‐ 92%, and 82% in 2002 and 2003, correspondingly. Santrauka Atlikta kietosios kosminės spinduliuotės srauto variacijų analizė energijų intervale 1,2–1,6 MeV Vilniaus mieste. Nustatytas ryšis tarp kietosios kosminės spinduliuotės srauto (KKSS) sumažėjimo šiame intervale ir atmosferos slėgio kitimo, kuris įvyks per 3–4 paras. Toks ryšis registruojamas tik nuo 8 val. iki 13 val. KKSS mažėjimas Vilniaus mieste priklauso nuo laiko intervalo, pvz., nuo 8–9 ir 9–10 val. slėgis sumažėja po 3–4 dienų; 11–12 ir 12–13 val. slėgis sumažėja po 5–6 dienų. Prognozės efektyvumas viename iš laiko intervalų buvo nuo 56–67 % 2002–2003 m. atitinkamai. To paties tyrimo rezultatai, įskaitant ir atmosferos slėgio mažėjimą nuo 1005 hPa ir mažiau, parodė aukštą prognozės efektyvumą visuose laiko intervaluose per 6 dienas – 92 % ir 82 % 2002–2003 metais atitinkamai. Резюме Проведен анализ колебаний потока жесткого космического излучения (ПЖКИ) в энергетическом интервале 1,2– 1,6 МэВ в г. Вильнюсе. Установлена связь между падением ПЖКИ в этом энергетическом интервале и изменением атмосферного давления, которое произойдет через 3–6 суток. Такая связь регистрируется только с 8 час. до 13 часов. В зависимости от интервала времени регистрации падения ПЖКИ, в частности, 8–9 часов, 9–10 часов – наименьшее давление в г. Вильнюсе образуется через 3–4 суток, а 11–12 часов и 12–13 часов – через 5–6 суток. Выполнимость такого прогноза по падению ПЖКИ в одном временном интервале в среднем соответствовала 56– 67% в 2002–2003 гг. Результаты аналогичного исследования с учетом того, что атмосферное давление уменьшается, начиная с 1005 гПа и ниже, показали высокую эффективность прогноза формирования наименьшего давления в г. Вильнюсе по падению ПЖКИ во всех временных интервалах в течение 6 суток – 92% и 82% в 2002 и 2003 гг. соответственно.


2010 ◽  
Vol 18 (3) ◽  
pp. 226-233 ◽  
Author(s):  
Dmitrijus Styro ◽  
Jovita Damauskaitė ◽  
Jonas Kleiza

This paper focuses on the analysis of connection between changes in hard cosmic ray flux (HCRF) and atmospheric pressure. To analyse connection between HCRF and atmospheric pressure change, the data of HCRF were obtained using a gamma spectrometer. The statistical data of measurements have been analysed. Detailed information on atmospheric pressure was presented by the Lithuanian Hydrometeorological Service. Correlation coefficients were calculated by performing a simple linear regression analysis between HCRF and atmospheric pressure in the same day. A strong inverse correlation during simultaneous measurements was determined. The correlation coefficients were defined for different seasons of the year. An empirical criterion of –20 imp/h was chosen in analysis of HCRF. Connection between HCRF decrease at 1.2–1.6 MeV energy interval and the minimum atmospheric pressure in 3–6 days at individual time intervals is defined in Vilnius. The efficiency of prognosis was 59–73% for the period 2004–2005. Santrauka Straipsnyje analizuojamas kietosios kosmines spinduliuotes srauto (KKSS) ir atmosferos slegio pokyčiu saryšis. KKSS buvo matuojamas gama spektrometru su scintiliaciniu jutikliu. Išsamia meteorologine informacija pateike Lietuvos hidrometeorologijos tarnyba. Koreliacijos koeficientai apskaičiuoti taikant tiesine regresija tarp KKSS ir atmosferos slegio pokyčiu. Nustatyta stipri atvirkštine koreliacija, kai matavimai atlikti ta pačia diena. Gauti skirtingi ivairiu metu sezonu koreliacijos koeficientai. Atliekant KKSS mažejimo analize buvo parinktas empirinis kriterijus –20 imp./h. Nustatytas saryšis tarp KKSS mažejimo 1,2–1,6 MeV energetiniame intervale ir atmosferos slegio mažejimo po 3–6 paru Vilniuje. KKSS mažejimas buvo analizuojamas per 8–9, 9–10, 11–12, 12–13 val. laiko intervalus. 2004–2005 m. atmosferos slegio mažejimo prognozes efektyvumas Vilniuje pagal KKSS mažejima buvo 59–73 %. Резюме Анализируется связь между изменениями потока жёсткого космического излучения (ПЖКИ) и атмосферного давления. ПЖКИ определялся с помощью гамма-спектрометра со сцинтилляционным детектором. Подробная метеорологическая информация была прегoставлена гидрометеорологической службой Литвы. Коэффициенты корреляции между колебаниями ПЖКИ и атмосферного давления были рассчитаны методом прямой регрессии. Установлена сильная обратная корреляция для тех случаев, когда измерения проводились одновременно. Значения коэффициентов корреляции оказались различными для разных сезонов года. При проведении анализа уменьшения ПЖКИ был выбран эмпирический критерий – 20 имп/час. Установлена прогностическая связь между уменьшением ПЖКИ в энергическом интервале 1,2–1,6 МэВ и уменьшением атмосферного давления через 3–6 суток в г. Вильнюсе. Уменьшение ПЖКИ рассматривалось в следующих временных интервалах: 8–9, 9–10, 11–12, 12–13 час. Эффективность прогноза уменьшения атмосферного давления в г. Вильнюсе по уменьшению ПЖКИ составила 59–73% в 2004–2005 гг.


Author(s):  
Dmitrijus STYRO ◽  
Ana USOVAITE

The connection has been found between the course of cardiovascular diseases (CVD) and the hard cosmic ray flux (HCRF) near the ground surface in Vilnius. The course of air temperature and number of sunspot was simultaneously considered. The investigation was carried out for the average annual and average monthly values in the period of solar cycle 2001–2012. The course of average annual data is most identical for HCRF and number of sunspot: whereas, it significantly differs from CVD and temperature course. The stable connection between a course of average monthly values of HCRF and CVD is found. Such a connection for temperature and CVD had a negative correlation with coefficient of correlation –0.9. A rather weak correlation was between the change in the number of sunspots another characteristics. Values of correlation coefficient between them were less than 0.4 during all of the solar cycle2001–2012. The exception had taken place at the maximum solar activity, i. e. in 2001 and 2012 when values of correlation coefficient exceeded 0.5. For the short-term prognosis of CVD leaps exceeding average monthly value by 10%in 1–3 days after HCRF decrease according to the proposed criterion, the high efficiency of the results 68–79% was obtained. The variation of sunspot number isn’t connected with these data. A short-term connection between the change in air temperature, the change in the sunspot number and CVD leaps has not been found. The human factor has an additional influence on CVD leaps, which was considered in these studies.


1987 ◽  
Vol 120 ◽  
pp. 443-445
Author(s):  
Valerio Pirronello

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.


1967 ◽  
Vol 1 (1) ◽  
pp. 29-30
Author(s):  
K. G. McCracken

Instruments were flown on the Pioneer 6 and 7 spacecraft during 1965-66 to study the degree of anisotropy of cosmic radiation in the energy range 7.5-90 Mev/nucleón. The instruments record the cosmic ray fluxes from each of four contiguous ‘quadrants’ of azimuthal rotation of the spacecraft, for each of three energy windows 7.5-45 Mev, 45-90 Mev, and 150-350 Mev for alpha particles and heavier nuclei. In addition, the counting rate of all particles of energy >7.5 Mev is recorded, thereby providing cosmic ray data of high statistical precision useful in the study of fast changes in the cosmic ray flux.


2019 ◽  
Vol 50 (6) ◽  
pp. 826-835 ◽  
Author(s):  
I. A. Lagoida ◽  
S. A. Voronov ◽  
V. V. Mikhailov

2020 ◽  
Vol 108 (8) ◽  
pp. 593-602 ◽  
Author(s):  
Gaia Pupillo ◽  
Liliana Mou ◽  
Petra Martini ◽  
Micòl Pasquali ◽  
Alessandra Boschi ◽  
...  

AbstractDespite its insufficient availability, Copper-67 is currently attracting much attention for its enormous potential for cancer therapy as theranostic radionuclide. This work aims to accurately measure the unexplored cross section 70Zn(p,x)67Cu in the energy range 45–70 MeV and to evaluate its potential advantages in the case of high-intensity proton beams provided by compact cyclotrons. Thin target foils of enriched 70Zn were manufactured by lamination at the INFN-LNL and irradiated at the ARRONAX facility using the stacked-foils method. A radiochemical procedure for the separation of Cu, Ga and Zn contaminants and the isolation of 67Cu from the irradiated material was developed. The efficiency of the chemical processing was determined for each foil by monitoring the activity of selected tracer radionuclides (61Cu, 66Ga and 69mZn) through γ-spectrometry. Experimental data of the 70Zn(p,x)67Cu, 64Cu, 67Ga, 66Ga, 69mZn, 65Zn cross sections were measured for the first time in the energy range 45–70 MeV and compared with the theoretical results obtained by using the TALYS code. The 67Cu production yield by using enriched 70Zn thick targets was compared with the results obtained by using 68Zn targets in the same irradiation conditions.


1968 ◽  
Vol 1 (3) ◽  
pp. 114-115
Author(s):  
J.G. Ables

The cosmic ray flux in the energy range 100 MeV/nucleon ≤ E ≤ 1 GeV/nucleon is remarkable for its high degree of isotropy. Observed deviations from isotropy seldom exceed a few per cent and are commonly much smaller. The mechanism responsible for this isotropy is presumed to be multiple, large-angle scattering of the charged cosmic ray particles by irregularities of the interplanetary magnetic field. While generally precluding any hope of discovering a source-related anisotropy of the flux in this energy range, it is just this strong interaction of the cosmic rays with the interplanetary medium that allows the study of the small observed anisotropies, both persistent and transient, to yield considerable information about the structure of the interplanetary medium (the solar wind and its entrapped magnetic field).


1959 ◽  
Vol 37 (5) ◽  
pp. 569-578 ◽  
Author(s):  
A. G. Fenton ◽  
D. C. Rose ◽  
K. G. McCracken ◽  
B. G. Wilson

Recent nucleon intensity data obtained from high counting rate recorders at Ottawa and Hobart, and subsidiary stations, have been examined for evidence for the superposition of transient decreases. It is concluded that, with the statistical accuracy now available due to the high counting rates, it is possible to distinguish two types of transient decreases in the observed variations, superimposed upon the slower 11-year intensity changes. One of these is an almost symmetrical event lasting up to 2 weeks and exhibiting a recurrence tendency of about 27 days, while the other is the more abrupt Forbush decrease which recovers over a period of several days. The evidence indicates that the intensity-controlling mechanism responsible for these short-term transient changes is able to influence the cosmic ray flux at the earth independently of other events that may be in progress at the time. There is also evidence that the physical process controlling the Forbush type of decrease operates over a volume large compared with the earth because the intensity changes at places as far apart as Ottawa, Canada, and Hobart, Tasmania, show changes that are the same within the accuracy of the measurements.


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