Introduction to the current status of solar magnetic field measurements in China

2020 ◽  
Author(s):  
Yuanyong Deng
Keyword(s):  
Magnetic Field ◽  
Field Measurement ◽  
Solar Magnetic Field ◽  
Interplanetary Space ◽  
Field Measurements ◽  
Current Status ◽  
Magnetic Field Measurement ◽  
Magnetic Field Measurements ◽  
History Of ◽  
Early Century

<p>Solar magnetic field is a key paramters to understand the solar activity and its influence to the interplanetary space in the solar system. The solar magnetic field measurement is always an enormous challenge to the solar community. We firstly overview the history of solar magnetic field measurement since last early century and analyze the difficulty and progress of pratical methods. Then we introduce an infrared system for the accurate measurement of solar magnetic field (AIMS) and its current progress, which is supported by National Natural Science Foundation of China and also the current ongoing space based projects (ASO-S/FMG) to measure the solar magnetic field in China.</p>

scholarly journals Reconstructing solar magnetic fields from historical observations

2019 ◽  
Vol 628 ◽  
pp. A103 ◽  
Author(s):  
Alexei A. Pevtsov ◽  
Kseniya A. Tlatova ◽  
Alexander A. Pevtsov ◽  
Elina Heikkinen ◽  
Ilpo Virtanen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Solar Magnetic Field ◽  
Field Measurements ◽  
Solar Magnetic Fields ◽  
Mount Wilson Observatory ◽  
Magnetic Field Measurements ◽  
History Of ◽  
Selection Of

Context. Systematic observations of magnetic field strength and polarity in sunspots began at Mount Wilson Observatory (MWO), USA in early 1917. Except for a few brief interruptions, this historical dataset has continued until the present. Aims. Sunspot field strength and polarity observations are critical in our project of reconstructing the solar magnetic field over the last hundred years. We provide a detailed description of the newly digitized dataset of drawings of sunspot magnetic field observations. Methods. The digitization of MWO drawings is based on a software package that we developed. It includes a semiautomatic selection of solar limbs and other features of the drawing, and a manual entry of the time of observations, measured field strength, and other notes handwritten on each drawing. The data are preserved in an MySQL database. Results. We provide a brief history of the project and describe the results from digitizing this historical dataset. We also provide a summary of the final dataset and describe its known limitations. Finally, we compare the sunspot magnetic field measurements with those from other instruments, and demonstrate that, if needed, the dataset could be continued using modern observations such as, for example, the Vector Stokes Magnetograph on the Synoptic Optical Long-term Investigations of the Sun platform.

scholarly journals Attitude Estimation of Underwater Vehicles Using Field Measurements and Bias Compensation

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 330 ◽  
Author(s):  
Nak Ko ◽  
Seokki Jeong ◽  
Suk-seung Hwang ◽  
Jae-Young Pyun
Keyword(s):  
Magnetic Field ◽  
Field Measurement ◽  
Field Measurements ◽  
Underwater Vehicle ◽  
Field Vector ◽  
Attitude Estimation ◽  
Magnetic Field Measurement ◽  
Euler Angles ◽  
Measured Field ◽  
The Magnetic Field

This paper proposes a method of estimating the attitude of an underwater vehicle. The proposed method uses two field measurements, namely, a gravitational field and a magnetic field represented in terms of vectors in three-dimensional space. In many existing methods that convert the measured field vectors into Euler angles, the yaw accuracy is affected by the uncertainty of the gravitational measurement and by the uncertainty of the magnetic field measurement. Additionally, previous methods have used the magnetic field measurement under the assumption that the magnetic field has only a horizontal component. The proposed method utilizes all field measurement components as they are, without converting them into Euler angles. The bias in the measured magnetic field vector is estimated and compensated to take full advantage of all measured field vector components. Because the proposed method deals with the measured field independently, uncertainties in the measured vectors affect the attitude estimation separately without adding up. The proposed method was tested by conducting navigation experiments with an unmanned underwater vehicle inside test tanks. The results were compared with those obtained by other methods, wherein the Euler angles converted from the measured field vectors were used as measurements.

Solar magnetic-field measurements using Babinet compensators

Solar Physics ◽  
1969 ◽  
Vol 6 (3) ◽  
pp. 480-481 ◽  
Author(s):  
J. M. Beckers ◽  
J. O. Stenflo
Keyword(s):  
Magnetic Field ◽  
Solar Magnetic Field ◽  
Field Measurements ◽  
Magnetic Field Measurements

Stokes polarimeter for mid-IR solar magnetic field measurements

2003 ◽  
Author(s):  
George H. McCabe ◽  
Donald E. Jennings ◽  
Drake Deming ◽  
Pedro Sada ◽  
Thomas Moran
Keyword(s):  
Magnetic Field ◽  
Solar Magnetic Field ◽  
Field Measurements ◽  
Magnetic Field Measurements

scholarly journals Improvements of the Longitudinal Magnetic Field Measurement from the Solar Magnetic Field Telescope at the Huairou Solar Observing Station

Solar Physics ◽  
2021 ◽  
Vol 296 (11) ◽  
Author(s):  
Andrei Plotnikov ◽  
Alexander Kutsenko ◽  
Shangbin Yang ◽  
Haiquing Xu ◽  
Xianyong Bai ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Measurement ◽  
Longitudinal Magnetic Field ◽  
Solar Magnetic Field ◽  
Magnetic Field Measurement

Observing the Sun with the Atacama Large Millimeter/submillimeter Array – from continuum to magnetic fields

2019 ◽  
Vol 15 (S354) ◽  
pp. 24-37
Author(s):  
Sven Wedemeyer ◽  
Mikolaj Szydlarski ◽  
Jaime de la Cruz Rodriguez ◽  
Shahin Jafarzadeh
Keyword(s):  
Magnetic Field ◽  
Time Series ◽  
Solar Magnetic Field ◽  
Extended Period ◽  
Field Measurements ◽  
The Sun ◽  
Post Processing ◽  
Magnetic Field Measurements ◽  
Scientific Results ◽  
Temperature Maps

AbstractThe Atacama Large Millimeter/submillimeter Array offers regular observations of our Sun since 2016. After an extended period of further developing and optimizing the post-processing procedures, first scientific results are now produced. While the first observing cycles mostly provided mosaics and time series of continuum brightness temperature maps with a cadence of 1-2s, additional receiver bands and polarization capabilities will be offered in the future. Currently, polarization capabilities are offered for selected receiver bands but not yet for solar observing. An overview of the recent development, first scientific results and potential of solar magnetic field measurements with ALMA will be presented.

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