scholarly journals An Enhancement of Jupiter's Main Auroral Emission and Magnetospheric Currents

2020 ◽  
Vol 125 (8) ◽  
Author(s):  
J. D. Nichols ◽  
F. Allegrini ◽  
F. Bagenal ◽  
E. J. Bunce ◽  
S. W. H. Cowley ◽  
...  
Keyword(s):  
Auroral Emission ◽  
Magnetospheric Currents

scholarly journals Cloud Cover and Aurora Contamination at Dome A in 2017 from KLCAM

2020 ◽  
Author(s):  
Xu Yang ◽  
Zhaohui Shang ◽  
Keliang Hu ◽  
Yi Hu ◽  
Bin Ma ◽  
...  
Keyword(s):  
Cloud Cover ◽  
Emission Lines ◽  
Austral Winter ◽  
Site Testing ◽  
Dome A ◽  
Astronomical Observations ◽  
Auroral Emission ◽  
Long Term Monitoring ◽  
Term Monitoring

Abstract Dome A in Antarctica has many characteristics that make it an excellent site for astronomical observations, from the optical to the terahertz. Quantitative site testing is still needed to confirm the site’s properties. In this paper, we present a statistical analysis of cloud cover and aurora contamination from the Kunlun Cloud and Aurora Monitor (KLCAM). KLCAM is an automatic, unattended all-sky camera aiming for long-term monitoring of the usable observing time and optical sky background at Dome A. It was installed at Dome A in January 2017, worked through the austral winter, and collected over 47,000 images over 490 days. A semi-quantitative visual data analysis of cloud cover and auroral contamination was carried out by five individuals. The analysis shows that the night sky was free of clouds for 83 per cent of the time, which ranks Dome A highly in a comparison with other observatory sites. Although aurorae were detected somewhere on an image for nearly 45 per cent of the time, the chance of a point on the sky being affected by an aurora is small. The strongest auroral emission lines can be filtered out with customized filters.

scholarly journals First negative system of N<sub>2</sub><sup>+</sup> in aurora: simultaneous space-borne and ground-based measurements and modeling results

2014 ◽  
Vol 32 (5) ◽  
pp. 499-506 ◽  
Author(s):  
K. Axelsson ◽  
T. Sergienko ◽  
H. Nilsson ◽  
U. Brändström ◽  
K. Asamura ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Electron Flux ◽  
Imaging System ◽  
Electron Excitation ◽  
Absolute Calibration ◽  
Simultaneous Measurements ◽  
Auroral Emission ◽  
Negative System ◽  
Correct Comparison

Abstract. The auroral emission of the first negative system of N2+ at 427.8 nm is analyzed using simultaneous measurements from the ground with ALIS (Auroral Large Imaging System) and from space with optical (MAC) and particle (ESA) instruments of the Reimei satellite. The study has two main objectives. The first is validation of the absolute calibration of the ALIS and the Reimei MAC cameras. The other task is to evaluate different cross sections of the electron excitation of N2+ that are used for the modeling of the auroral 1N system emissions. The simultaneous measurements of the 427.8 nm emission by ALIS and Reimei imagers show excellent agreement, indicating that the calibration of the two instruments is correct. Comparison of the 427.8 nm emission intensity calculated using the incident electron flux measured by the Reimei particle instruments with intensities measured by the optical imagers show that the best match is reached with the cross section from Shemansky and Liu (2005).

scholarly journals Nebular and auroral emission lines of [Cl III] in the optical spectra of planetary nebulae

2000 ◽  
Vol 97 (9) ◽  
pp. 4551-4555 ◽  
Author(s):  
F. P. Keenan ◽  
L. H. Aller ◽  
C. A. Ramsbottom ◽  
K. L. Bell ◽  
F. L. Crawford ◽  
...  
Keyword(s):  
Planetary Nebulae ◽  
Optical Spectra ◽  
Emission Lines ◽  
Auroral Emission

scholarly journals How is the Jovian main auroral emission affected by the solar wind?

2017 ◽  
Vol 122 (2) ◽  
pp. 1960-1978 ◽  
Author(s):  
E. Chané ◽  
J. Saur ◽  
R. Keppens ◽  
S. Poedts
Keyword(s):  
Solar Wind ◽  
Auroral Emission

Electron partial density and temperature over Jupiter’s main auroral emission using Juno observations

2021 ◽  
Author(s):  
F. Allegrini ◽  
W. S. Kurth ◽  
S. S. Elliott ◽  
J. Saur ◽  
G. Livadiotis ◽  
...  
Keyword(s):  
Partial Density ◽  
Auroral Emission

scholarly journals Transpolar arc evolution and associated potential patterns

2004 ◽  
Vol 22 (4) ◽  
pp. 1213-1231 ◽  
Author(s):  
J. A. Cumnock ◽  
L. G. Blomberg
Keyword(s):  
Magnetic Field ◽  
Electric Fields ◽  
Polar Region ◽  
Auroral Oval ◽  
Plasma Convection ◽  
Auroral Emission ◽  
Field Aligned Current ◽  
Auroral Emissions ◽  
Institute Of Technology ◽  
Electric Fields And Currents

Abstract. We present two event studies encompassing detailed relationships between plasma convection, field-aligned current, auroral emission, and particle precipitation boundaries. We illustrate the influence of the Interplanetary Magnetic Field By component on theta aurora development by showing two events during which the theta originates on both the dawn and dusk sides of the auroral oval. Both theta then move across the entire polar region and become part of the opposite side of the auroral oval. Electric and magnetic field and precipitating particle data are provided by DMSP, while the Polar UVI instrument provides measurements of auroral emissions. Utilizing satellite data as inputs, the Royal Institute of Technology model provides the high-latitude ionospheric electrostatic potential pattern calculated at different times during the evolution of the theta aurora, resulting from a variety of field-aligned current configurations associated with the changing global aurora. Key words. Ionosphere (auroral ionosphere; electric fields and currents). Magnetospheric physics (magnetosphereionosphere interactions)

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