Results 11 to 20 of about 86,915 (297)

The high optical brightness of the BlueWalker 3 satellite

Nature, 2023
Abstract Large constellations of bright artificial satellites in low Earth orbit pose significant challenges to ground-based astronomy 1 . Current orbiting constellation satellites have brightnesses between apparent magnitudes 4 and 6, whereas in the near-infrared Ks band ...
Sangeetha Nandakumar, Siegfried Eggl, J. Tregloan-Reed, Christian Adam, Jasmine Anderson-Baldwin, Michele Bannister, Adam Battle, Z. Benkhaldoun, Tanner Campbell, J. P. Colque, G. Damke, Ilse Plauchu Frayn, Mourad Ghachoui, P. F. Guillén, Aziz Ettahar Kaeouach, Harrison Krantz, Marco Langbroek, Nicholas J. Rattenbury, V. Reddy, Ryan Ridden-Harper, Brad de Young, E. Unda-Sanzana, A. M. Watson, Constance E. Walker, John C. Barentine, P. Benvenuti, Federico Di Vruno, M. Peel, Meredith L. Rawls, C. G. Bassa, Catalina Flores, P. García, Seongseop Kim, Penélope Longa-Peña, Edgar Ortíz, Ángel Otarola, Marı́a Romero-Colmenares, Pedro Sanhueza, G. Siringo, M. Soto   +39 more
openaire   +6 more sources

Wenchuan earthquake: Brightness temperature changes from satellite infrared information

Chinese Science Bulletin, 2010
By using an alternative processing method for satellite infrared remote sensing data and adopting the China Geostationary Meteorological Satellite (FY-2C) infrared remote sensing brightness temperature data, we studied the great 2008 Wenchuan Ms8.0 earthquake. Results indicate the obvious characteristic period and amplitude, and distribution of thermal
YuanSheng Zhang, Xiao Guo, MeiJiao Zhong, WenRong Shen, Wen Li, Bin He   +5 more
openaire   +3 more sources

The SSR Brightness Temperature Increment Model Based on a Deep Neural Network

Remote Sensing, 2023
The SSS (sea surface salinity) is an important factor affecting global climate changes, sea dynamic environments, global water cycles, marine ecological environments, and ocean carbon cycles.
Zhongkai Wen, Huan Zhang, Weiping Shu, Liqiang Zhang, Lei Liu, Xiang Lu, Yashi Zhou, Jingjing Ren, Shuang Li, Qingjun Zhang   +9 more
doaj   +1 more source

A Soil Moisture Retrieval Method for Reducing Topographic Effect: A Case Study on the Qinghai–Tibetan Plateau With SMOS Data

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2023
The topography can be very important for passive microwave remote sensing of soil moisture due to its complex influence on the emitted brightness temperature observed by a satellite microwave radiometer.
Yu Bai, Li Jia, Tianjie Zhao, Jiancheng Shi, Zhiqing Peng, Shaojie Du, Jingyao Zheng, Zhen Wang, Dong Fan   +8 more
doaj   +1 more source

Psychological Brightness Reduction of Simulated Flashes from a Polyhedral Satellite

Science, 1958
openaire   +5 more sources

GROUND-BASED CLOUD OBSERVATION FOR SATELLITE-BASED CLOUD DISCRIMINATION AND ITS VALIDATION [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2012
Solar radiation is a source of energy for ground surfaces. Clouds control energy budget on both local and global scales. We propose the simple ground-based observation method for various sky conditions instead of the existing visual observation. In the
M. Yamashita, M. Yoshimura
doaj   +1 more source

Map of Sky Brightness over Greater Bandung and the Prospect of Astro-Tourism

Indonesian Journal of Geography, 2019
In this paper, result of moving campaigns of night sky brightness measurement over Greater Bandung area is reported. Though the campaigns were not commenced in ideal condition in terms of cloud cover and moon light contamination, the result is quite ...
Rhorom Priyatikanto, Agustinus Gunawan Admiranto, Gerhana Puannandra Putri, Elyyani Elyyani, Siti Maryam, Nana Suryana   +5 more
doaj   +1 more source

Historical and real-time estimation of snow depth in Eurasia based on multiple passive microwave data

Advances in Climate Change Research, 2023
Current snow depth datasets demonstrate large discrepancies in the spatial pattern in Eurasia, and the lagging updates of datasets do not meet the operational requirements of the meteorological service department. This study developed a dynamic retrieval
Li-Yun Dai, Li-Juan Ma, Su-Ping Nie, Si-Yu Wei, Tao Che   +4 more
doaj   +1 more source

Satellites of the largest Kuiper Belt objects [PDF]

, 2006
We have searched the four brightest objects in the Kuiper Belt for the presence of satellites using the newly commissioned Keck Observatory Laser Guide Star Adaptive Optics system.
Bouchez, A. H., Brown, M. E., Campbell, R. D., Chin, J. C. Y., Conrad, A., Hartman, S. K., Johansson, E. M., Lafon, R. E., Le Mignant, D., Rabinowitz, D. L., Stomski, P. J., Jr., Summers, D. M., Trujillo, C. A., van Dam, M. A., Wizinowich, P. L.   +14 more
core   +2 more sources

BlueWalker 3 Satellite Brightness Characterized and Modeled

, 2023
The BlueWalker 3 (BW3) satellite was folded into a compact object when launched on 2022 September 11. The spacecraft's apparent visual magnitude initially ranged from about 4 to 8. Observations on November 11 revealed that the brightness increased by 4 magnitudes which indicated that the spacecraft had deployed into a large flat-panel shape.
Mallama, Anthony, Cole, Richard E., Tilley, Scott, Bassa, Cees, Harrington, Scott   +4 more
openaire   +2 more sources