共查询到19条相似文献,搜索用时 31 毫秒
1.
<正>美国东部时间2014年10月28日18:22,执行第三次"商业补给服务"(CRS)合同任务(Orb-3)的安塔瑞斯-130(Antares-130)火箭发射,但火箭在升空6 s后发生爆炸,火箭落回发射台时又引起了二次爆炸,火箭及其搭载的"天鹅座"(Cygnus)飞船随即损毁。这既是"安塔瑞斯"火箭首次夜间发射,也是其首次发射失败,同时是"天鹅座"任务的首次失败。 相似文献
2.
3.
<正>北京时间2009年10月28日23:30,美国航空航天局(NASA)战神-1-X(Ares-1-X)火箭进行了测试飞行。"战神"系列火箭是一种新型运载火箭,将在航天飞机退役后开始运行,并成为美国"重返月球"的航天器之一。 相似文献
4.
5.
6.
7.
<正>说起女性在太空探索中的贡献,人们首先想到的是女航天员。其实她们出任的角色远比航天员广泛得多,可以是科学家、设计师、工程师,是教师、秘书、工人,还可以是高层管理者——2022年,美国宇航局的肯尼迪航天中心、马歇尔航天中心、约翰逊航天中心、格伦研究中心在任的4位主任都是女性。 相似文献
8.
<正>1月15日,伊朗在塞姆南省的伊玛目·霍梅尼航天中心采用神鸟运载火箭进行了一次卫星发射,但未能将称为"埃米尔卡比尔之声"的一颗卫星送入轨道。伊朗通信与信息部长穆罕默德·贾赫鲁米称,火箭一二级分离正常,但第三级未能达到预定速度, 相似文献
9.
10.
《中国空间科学技术》1994,14(1)
"长征三号甲"火箭发射试验成功1994年2月8日40时30分,倾注了我国航天工作者8年心血,拥有多项先进技术的大型运载火箭"长征三号甲"以雷霆万钧之力拔地而起,直刺蓝天。20分钟后"实践四号"卫星和模拟星进入地球同步转移轨道,发射试验取得了成功。"长... 相似文献
11.
2017年5月25日,美国火箭实验室公司(Rocket Lab)自主研制的"电子"(Electron)专用小卫星运载火箭进行了首次发射试验,火箭未能进入预定轨道,但本次试飞成功验证了多项火箭性能指标,标志着该火箭向正式投入商业运营迈出了重要的一步。 相似文献
12.
商业航天是指以商业为目的并用市场化的模式运行的航天活动。实际上,在应用卫星领域,如通信卫星和遥感卫星等,早就开始了市场化过程,并取得了很大成效。在西方成熟的市场经济体制下,这个进程并未引起人们的过度关注。当一个行业的技术和产品已足够成熟,把它推向市场和进行商业运作是顺理成章的事情。然而最近几年,商业航天的话题再次引起国际航天界的关注,则是因为美国在载人航天领域首先引入了商业和市场机制。 相似文献
13.
利用2010年6月3日子午工程首次气象火箭探测的温度和风场数据,采用矢端曲线法分别从平流层(20~50km)和对流层(0~15km)廓线提取了海南火箭发射场上空准单色惯性重力波参数.火箭探测的平流层和对流层两个准单色惯性重力波分别向上和向下逆风传播,固有周期为20.1h和22.4h,垂直波长为9.5km和4.0km,水平波长为2900km和753km,垂直群速度cgz为0.0887m·-1和0.0298m·-1,水平群速度cgh为12.7m·-1和3.65m·-1,λh/λz为305:1和188:1,cgh/cgz为143:1和122:1.
相似文献14.
15.
2016年4月27日02:00,中国科学院国家空间科学中心(以下简称空间中心)在位于海南省儋州市的中国科学院海南探空部成功发射了天鹰-3F空间环境垂直探测试验火箭。该火箭搭载的鲲鹏-1B探空仪开展了多项科学探测及技术试验任务,首次成功获得了电离层顶的原位探测数据,标志着我国已经具备了用探空火箭飞到更高高度的空间环境探测运载能力。 相似文献
16.
17.
First results of operational ionospheric dynamics prediction for the Brazilian Space Weather program
Adriano Petry Jonas Rodrigues de Souza Haroldo Fraga de Campos Velho André Grahl Pereira Graham John Bailey 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2014
It is shown the development and preliminary results of operational ionosphere dynamics prediction system for the Brazilian Space Weather program. The system is based on the Sheffield University Plasmasphere–Ionosphere Model (SUPIM), a physics-based model computer code describing the distribution of ionization within the Earth mid to equatorial latitude ionosphere and plasmasphere, during geomagnetically quiet periods. The model outputs are given in a 2-dimensional plane aligned with Earth magnetic field lines, with fixed magnetic longitude coordinate. The code was adapted to provide the output in geographical coordinates. It was made referring to the Earth’s magnetic field as an eccentric dipole, using the approximation based on International Geomagnetic Reference Field (IGRF-11). During the system operation, several simulation runs are performed at different longitudes. The original code would not be able to run all simulations serially in reasonable time. So, a parallel version for the code was developed for enhancing the performance. After preliminary tests, it was frequently observed code instability, when negative ion temperatures or concentrations prevented the code from continuing its processing. After a detailed analysis, it was verified that most of these problems occurred due to concentration estimation of simulation points located at high altitudes, typically over 4000 km of altitude. In order to force convergence, an artificial exponential decay for ion–neutral collisional frequency was used above mentioned altitudes. This approach shown no significant difference from original code output, but improved substantially the code stability. In order to make operational system even more stable, the initial altitude and initial ion concentration values used on exponential decay equation are changed when convergence is not achieved, within pre-defined values. When all code runs end, the longitude of every point is then compared with its original reference station longitude, and differences are compensated by changing the simulation point time slot, in a temporal adjustment optimization. Then, an approximate neighbor searching technique was developed to obtain the ion concentration values in a regularly spaced grid, using inverse distance weighting (IDW) interpolation. A 3D grid containing ion and electron concentrations is generated for every hour of simulated day. Its spatial resolution is 1° of latitude per 1° of longitude per 10 km of altitude. The vertical total electron content (VTEC) is calculated from the grid, and plotted in a geographic map. An important feature that was implemented in the system is the capacity of combining observational data and simulation outputs to obtain more appropriate initial conditions to the ionosphere prediction. Newtonian relaxation method was used for this data assimilation process, where ionosonde data from four different locations in South America was used to improve the system accuracy. The whole process runs every day and predicts the VTEC values for South America region with almost 24 h ahead. 相似文献
18.