Aerospace Research in Bulgaria最新文献_第5页

Investigation of the similarity algorithm of the satellite images storage system for stability on the basis of Haar wavelets according to Tikhonov 基于吉洪诺夫Haar小波的卫星图像存储系统稳定性相似算法研究

IF 0.3

Aerospace Research in Bulgaria Pub Date : 2019-01-01 DOI: 10.3897/arb.v31.e06

M. Kazaryan, M. Shahramanian, S. Zabunov

引用次数: 3

Electric vertical take-off and landing fixed wing unmanned aerial vehicle for long endurance or long range? 电动垂直起降固定翼无人机是长航时还是远程?

IF 0.3

Aerospace Research in Bulgaria Pub Date : 2019-01-01 DOI: 10.3897/arb.v31.e08

D. Zafirov

引用次数: 0

Model of the operator for controlling the aircraft with mathematical modelling of the movement 用运动的数学模型来控制飞机的操作员模型

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Aerospace Research in Bulgaria Pub Date : 2019-01-01 DOI: 10.3897/arb.v31.e13

Ognyan Stoykov

引用次数: 0

Secondary power supply system for spacecraft potential monitor DP-1 and DP-2, "OBSTANOVKA" project, International Space Station 国际空间站“OBSTANOVKA”项目航天器电位监测器DP-1和DP-2二次供电系统

IF 0.3

Aerospace Research in Bulgaria Pub Date : 2019-01-01 DOI: 10.3897/arb.v31.e09

P. Gramatikov, R. Nedkov, G. Stanev

引用次数: 2

Cosmic ray and solar activity influences on long-term variations of cave climate systems 宇宙射线和太阳活动对洞穴气候系统长期变化的影响

IF 0.3

Aerospace Research in Bulgaria Pub Date : 2019-01-01 DOI: 10.3897/arb.v31.e05

A. Stoev, P. Stoeva

{"title":"Cosmic ray and solar activity influences on long-term variations of cave climate systems","authors":"A. Stoev, P. Stoeva","doi":"10.3897/arb.v31.e05","DOIUrl":"https://doi.org/10.3897/arb.v31.e05","url":null,"abstract":"During the analysis of solar activity impact on climate, the emphasis is placed on temperature changes. Earth's atmosphere is a dynamical system with a complex variability in space and time. Due to the fact that caves in Karst preserve the long term environmental changes, the investigation of the in-caves’ atmospheric parameters and their variations with time becomes very important in the last quarter of century. In this paper we investigate the temporal evolution of the temperature and pressure of the ground atmospheric layer in the region of two Bulgarian caves: Snezhanka (Pazardjik region) and Uhlovitsa (Smolyan region), during the period 2005–2017. We show that thermal and mass exchange of the caves’ air with the environment has significant temporal variations. On annual basis the thermo-dynamical parameters of the observed caves behaves as a barotropic fluid, in which the air density depends only on atmospheric pressure. As a result, the temporal evolution of in-caves’ pressure and temperature change synchronously with time. The observed 11-year signal could be attributed to the heliospheric modulation of galactic cosmic ray (GCR) intensity, which modulates the ozone and humidity near the tropopause and correspondingly the strength of the atmospheric greenhouse effect. Our study helps to clarify the influence of helio-geophysical factors on the state of the lower atmosphere.","PeriodicalId":40457,"journal":{"name":"Aerospace Research in Bulgaria","volume":"1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70393767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Substorms manifestation at high and mid-latitudes during two large magnetic storm 两次大磁暴期间高纬度和中纬度亚暴的表现

IF 0.3

Aerospace Research in Bulgaria Pub Date : 2019-01-01 DOI: 10.3897/arb.v31.e03

V. Guineva, I. Despirak, N. Kleimenova

{"title":"Substorms manifestation at high and mid-latitudes during two large magnetic storm","authors":"V. Guineva, I. Despirak, N. Kleimenova","doi":"10.3897/arb.v31.e03","DOIUrl":"https://doi.org/10.3897/arb.v31.e03","url":null,"abstract":"The dynamics of magnetic substorms at high and middle latitudes during two severe geomagnetic storms: on 17March 2015 and on 22–23 June2015has been analyzed. The storms were rather similar: both storms were a result of the solar wind Sheath impact and both storms were characterized by a strong intensity (SYM/Hmin<–200nT). We studied the magnetic substorms during these storms on the base of the INTERMAGNET and IMAGE networks data. The attendant solar wind and Interplanetary Magnetic Field (IMF) parameters were taken from the OMNI data base. The spatial-temporal dynamics of three substorms was studied in detail: at 17:29 UT and at 22:55 UT during the first storm and at 18:33 UT during the second storm. The substorms on 17.03.2015originated during the main storm phase, and the onset of the substorm on 22.06.2015 followed the storm sudden commencement (SSC) of the second storm. All three substorms were characterized by a sharp poleward expansion of the westward electrojet simultaneously with a slower motion to lower latitudes. They were observed also at middle and low latitudes as positive magnetic bays. The westward electrojet reached ~71°CGMLat during the first two substorms and surpassed 75°CGMLat during the third substorm. Therefore, the first two events were “classical” substorms, and the third one –an “expanded” substorm. We suggested that this behavior is related to the different solar wind conditions: the “classical” substorms developed under magnetic cloud (MC) conditions, and the “expanded” –under the Sheath region effect.","PeriodicalId":40457,"journal":{"name":"Aerospace Research in Bulgaria","volume":"1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70393483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The global temperature anomalies related to the slowdown of atmospheric CO2 concentration observed from 1939 up to 1950 从1939年到1950年观测到的与大气CO2浓度下降有关的全球温度异常

IF 0.3

Aerospace Research in Bulgaria Pub Date : 2019-01-01 DOI: 10.3897/arb.v31.e04

R. Werner, V. Guineva

{"title":"The global temperature anomalies related to the slowdown of atmospheric CO2 concentration observed from 1939 up to 1950","authors":"R. Werner, V. Guineva","doi":"10.3897/arb.v31.e04","DOIUrl":"https://doi.org/10.3897/arb.v31.e04","url":null,"abstract":"It is very well known that carbon dioxide (CO2) accumulated in the atmosphere is the main climate driver. The first precise direct continuous measurements of the atmospheric CO2concentration were provided from Keeling since 1958 at Mauna Loa Observatory. The measurements are going on up to day. Law Dom ice core drilling was started in 1969 by the Australian ANARE program. The slowdown of the World economic development during the World War I, the Great Depression and the World War II, lead to deaccelerating the CO2 emissions. The integration of the total CO2emissions using the impulse response function concept shows that the observed slowdown of the CO2 emission is not sufficient to explain the CO2 plateau and additional CO2 sinks are necessary. Based on multiple regression models adjusted global temperatures were determined by removal of temperature influences other than related to CO2. The adjusted temperatures follow close the CO2 radiation term. The difference between the estimated adjusted temperature time evolution with and without the CO2 slowdown and also the short time trends demonstrate very clear the close relation between the temperature change and the CO2 radiative forcing. It is shown that the slowdown of the CO2 emission in the period from 1939 up to 1950 and the related CO2 concentration in the atmosphere, caused at least partially by human activities, generate a more slow increase of the temperature anomalies. Consequently CO2 is the leading variable of the relation surface temperature - CO2.","PeriodicalId":40457,"journal":{"name":"Aerospace Research in Bulgaria","volume":"1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70393612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0