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  • Analysis and Research on the Centimeter Band Receiver Amplitude Calibration Method
    Adv. Astron. (IF 2.353) Pub Date : 2020-07-03
    Kai Wang; Maozheng Chen; Jun Ma; Xuefeng Duan; Yang Wang; Liang Cao; Hao Yan; Binbin Xiang

    The receiver is a signal receiving device in a radio telescope system. As an important parameter to characterize the receiver performance, noise temperature is very practical to calibrate accurately. The traditional receiver noise temperature calibration method is the cold and ambient load method. Through the establishment of K-band ambient receiver, and its amplitude calibration test platform of the

    更新日期:2020-07-03
  • Introducing Our New Chief Editor
    Adv. Astron. (IF 2.353) Pub Date : 2020-06-30
    Josep M. Trigo-Rodríguez

    Advances in Astronomy is pleased to announce the appointment of Prof Josep Trigo Rodríguez as its new Chief Editor. In this Editorial, Prof Trigo introduces himself, describes some of the journal’s journey and current status, and shares his vision and aspirations for its future.

    更新日期:2020-06-30
  • Classification of Continuous Sky Brightness Data Using Random Forest
    Adv. Astron. (IF 2.353) Pub Date : 2020-04-01
    Rhorom Priyatikanto; Lidia Mayangsari; Rudi A. Prihandoko; Agustinus G. Admiranto

    Sky brightness measuring and monitoring are required to mitigate the negative effect of light pollution as a byproduct of modern civilization. Good handling of a pile of sky brightness data includes evaluation and classification of the data according to its quality and characteristics such that further analysis and inference can be conducted properly. This study aims to develop a classification model

    更新日期:2020-04-01
  • Fermi Degenerate Antineutrino Star Model of Dark Energy
    Adv. Astron. (IF 2.353) Pub Date : 2020-03-30
    Tom F. Neiser

    When the Large Hadron Collider resumes operations in 2021, several experiments will directly measure the motion of antihydrogen in free fall for the first time. Our current understanding of the universe is not yet fully prepared for the possibility that antimatter has negative gravitational mass. This paper proposes a model of cosmology, where the state of high energy density of the big bang is created

    更新日期:2020-03-30
  • Responses and Periodic Variations of Cosmic Ray Intensity and Solar Wind Speed to Sunspot Numbers
    Adv. Astron. (IF 2.353) Pub Date : 2020-02-24
    Jacob Oloketuyi; Yu Liu; Amobichukwu Chukwudi Amanambu; Mingyu Zhao

    To investigate the periodic behaviour and relationship of sunspot numbers with cosmic ray intensity and solar wind speed, we present analysis from daily data generated from 1995 January to 2018 December. Cross-correlation and wavelet transform tools were employed to carry out the investigation. The analyses confirmed that the cosmic ray intensity correlates negatively with the sunspot numbers, exhibiting

    更新日期:2020-02-24
  • A CME Automatic Detection Method Based on Adaptive Background Learning Technology
    Adv. Astron. (IF 2.353) Pub Date : 2019-11-07
    Zhenping Qiang; Xianyong Bai; Qinghui Zhang; Hong Lin

    In this paper, we describe a technique, which uses an adaptive background learning method to detect the CME (coronal mass ejections) automatically from SOHO/LASCO C2 image sequences. The method consists of several modules: adaptive background module, candidate CME area detection module, and CME detection module. The core of the method is based on adaptive background learning, where CMEs are assumed

    更新日期:2019-11-07
  • Mask-Pix2Pix Network for Overexposure Region Recovery of Solar Image
    Adv. Astron. (IF 2.353) Pub Date : 2019-09-05
    Dong Zhao; Long Xu; Linjie Chen; Yihua Yan; Ling-Yu Duan

    Overexposure may happen for imaging of solar observation as extremely violet solar bursts occur, which means that signal intensity goes beyond the dynamic range of imaging system of a telescope, resulting in loss of signal. For example, during solar flare, Atmospheric Imaging Assembly (AIA) of Solar Dynamics Observatory (SDO) often records overexposed images/videos, resulting loss of fine structures

    更新日期:2019-09-05
  • Intelligent Recognition of Time Stamp Characters in Solar Scanned Images from Film
    Adv. Astron. (IF 2.353) Pub Date : 2019-08-28
    Jiafeng Zhang; Guangzhong Lin; Shuguang Zeng; Sheng Zheng; Xiao Yang; Ganghua Lin; Xiangyun Zeng; Haimin Wang

    Prior to the availability of digital cameras, the solar observational images are typically recorded on films, and the information such as date and time were stamped in the same frames on film. It is significant to extract the time stamp information on the film so that the researchers can efficiently use the image data. This paper introduces an intelligent method for extracting time stamp information

    更新日期:2019-08-28
  • Full-Disk Solar Flare Forecasting Model Based on Data Mining Method
    Adv. Astron. (IF 2.353) Pub Date : 2019-08-01
    Rong Li; Yong Du

    Solar flare is one of the violent solar eruptive phenomena; many solar flare forecasting models are built based on the properties of active regions. However, most of these models only focus on active regions within 30° of solar disk center because of the projection effect. Using cost sensitive decision tree algorithm, we build two solar flare forecasting models from the active regions within 30° of

    更新日期:2019-08-01
  • Deep Learning for Automatic Recognition of Magnetic Type in Sunspot Groups
    Adv. Astron. (IF 2.353) Pub Date : 2019-08-01
    Yuanhui Fang; Yanmei Cui; Xianzhi Ao

    Sunspots are darker areas on the Sun’s photosphere and most of solar eruptions occur in complex sunspot groups. The Mount Wilson classification scheme describes the spatial distribution of magnetic polarities in sunspot groups, which plays an important role in forecasting solar flares. With the rapid accumulation of solar observation data, automatic recognition of magnetic type in sunspot groups is

    更新日期:2019-08-01
  • Effect of Ap-Index of Geomagnetic Activity on S&P 500 Stock Market Return
    Adv. Astron. (IF 2.353) Pub Date : 2019-07-14
    Lifang Peng; Ning Li; Jingwen Pan

    Geomagnetic activity with global influence is an essential object of space weather research and is a significant link in the section of the solar wind-magnetospheric coupling process. Research so far provides strong evidence that geomagnetic activity affects stock investment decisions by influencing human health, mood, and human behaviours. Therefore, this research investigates the empirical association

    更新日期:2019-07-14
  • Single and Multiwavelength Detection of Coronal Dimming and Coronal Wave Using Faster R-CNN
    Adv. Astron. (IF 2.353) Pub Date : 2019-07-08
    Zongxia Xie; Chunyang Ji

    Automatic detection of solar events, especially uncommon events such as coronal dimming (CD) and coronal wave (CW), is very important in solar physics research. The CD and CW are not only related to the detection of coronal mass ejections (CMEs) but also affect space weather. In this paper, we have studied methods for automatically detecting them. In addition, we have collected and processed a dataset

    更新日期:2019-07-08
  • Structural Analysis of Lunar Regolith from LPR CH-2 Data Based on Adaptive f-x E MD: LPR Data Processed by Adaptive f-x EMD
    Adv. Astron. (IF 2.353) Pub Date : 2019-07-01
    Bin Hu; Deli Wang; Ling Zhang; Zhaofa Zeng

    The Lunar Penetrating Radar (LPR) is one of the important scientific payloads in China’s Chang’E-3 (CE-3) to image within 100 m below the lunar surface. The acquired LPR data is significant for the research of lunar geological structure. Based on the sedimentary mechanism of lunar regolith, the regolith contains many rocks with different sizes. These local anomalies appear as diffraction in LPR data

    更新日期:2019-07-01
  • Several Geological Issues of Schrödinger Basin Exposed by CE-2 CELMS Data
    Adv. Astron. (IF 2.353) Pub Date : 2019-07-01
    Z. G. Meng; H. H. Wang; Y. C. Zheng; Y. Z. Wang; H. Miyamoto; Z. C. Cai; J. S. Ping; Y. Z. Zhu

    The study on the Schrödinger basin may provide important clues about the formation of South Pole-Aitken (SPA) basin. In this paper, the thermophysical features of Schrödinger basin were evaluated using the Chang’E-2 microwave sounder (CELMS) data. The results are as follows. (1) The geological units are reevaluated with the CELMS data and a new geological view was provided according to the brightness

    更新日期:2019-07-01
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