Enhancement of Night-Sky Molecular Nitrogen Emission in Polar Cap Absorption Events

Nature ◽  
1961 ◽  
Vol 190 (4772) ◽  
pp. 245-246 ◽  
Author(s):  
B. P. SANDFORD
Keyword(s):  
Molecular Nitrogen ◽  
Polar Cap ◽  
Nitrogen Emission ◽  
Night Sky

scholarly journals A Strong Infra-Red Radiation from Molecular Nitrogen in the Night Sky

1944 ◽  
Vol 66 (7-8) ◽  
pp. 225-226 ◽  
Author(s):  
Joel Stebbins ◽  
A. E. Whitford ◽  
P. Swings
Keyword(s):  
Molecular Nitrogen ◽  
Infra Red ◽  
Night Sky ◽  
Red Radiation

scholarly journals The early Earth under a superflare and super-CME attack: prospects for life

2015 ◽  
Vol 11 (S320) ◽  
pp. 409-415 ◽  
Author(s):  
Vladimir Airapetian ◽  
Alex Glocer ◽  
Guillaume Gronoff
Keyword(s):  
Molecular Nitrogen ◽  
Three Dimensional ◽  
Solar Energetic Particle ◽  
Early Earth ◽  
Polar Cap ◽  
Mhd Simulations ◽  
The Earth ◽  
The Origin Of Life ◽  
Mass Ejection ◽  
The Impact

AbstractKepler observations suggest that G-type stars produce powerful flares suggesting that the early Earth may also have been exposed to frequent and energetic solar explosive events generated by the young Sun. We show that powerful coronal mass ejection (CME) events associated with superflares impacting the Earth magnetosphere with a frequency of 1 event/day. What was the impact of superflares, CMEs and associated solar energetic particle (SEPs) events on the atmospheric erosion of the young Earth and habitability? In this paper we discuss our three-dimensional (3D) magnetohydrodynamic (MHD) simulations that show that frequent and energetic CMEs from the early Sun continuously destroyed the sub-solar parts of Earth's magnetosphere at heights < 1.25 RE. This suggests that CME shock accelerated energetic protons are capable of penetrating into the polar cap region and breaking atmospheric molecular nitrogen, the major ingredient of the early Earth atmosphere, into atomic nitrogen. Photo-collisional dissociation of molecular nitrogen and carbon dioxide creates reactive chemistry that efficiently produces nitrous oxide and hydrogen cyanide, the essential molecule in prebiotic life chemistry. This raises an possibility that frequent super-CMEs could serve as a potential catalyst for the origin of life on early Earth.

scholarly journals Polar cap optical observations of topside (>900 km) molecular nitrogen ions

1999 ◽  
Vol 26 (7) ◽  
pp. 1003-1006 ◽  
Author(s):  
G. J. Romick ◽  
J-H. Yee ◽  
M. F. Morgan ◽  
D. Morrison ◽  
L. J. Paxton ◽  
...  
Keyword(s):  
Molecular Nitrogen ◽  
Optical Observations ◽  
Polar Cap ◽  
Nitrogen Ions

scholarly journals On the wave-length of the green auroral line in the oxygen spectrum

1927 ◽  
Vol 115 (772) ◽  
pp. 515-527 ◽  
Keyword(s):  
Molecular Nitrogen ◽  
Wave Length ◽  
Accurate Determination ◽  
Upper Atmosphere ◽  
Night Sky

It is well known that the spectrum of the aurora is characterised by two outstanding features, the first of which is a set of bands with heads at or near λ = 3914 A, λ = 4278 A, and λ = 4708 A. The second is a strong narrow sharply-defined line close to λ = 5577 A. As to the bands, Lord Rayleigh, Dr. Slipher, Prof. Vegard and others have shown them to be identical with the so-called “negative” bands obtained with molecular nitrogen in the singlyionised state. Nitrogen in this state must, therefore, be one of the main con­stituents of that portion of the upper atmosphere in which auroral displays occur. As to the line λ = 5577 A, it is the strongest constituent of the spectrum of the aurora. Lord Rayleigh, Dr. Slipher, Dr. Babcock and others have shown that it can be obtained as well in the spectrum of the light of the night sky. In 1923 Dr. Babcock made an accurate determination of its wave-length with a Fabry and Perot interferometer and found it to be 5577·350 ± 0·005 I. A.

scholarly journals A Strong Infrared Radiation from Molecular Nitrogen in the Night Sky.

1945 ◽  
Vol 101 ◽  
pp. 39 ◽  
Author(s):  
Joel Stebbins ◽  
A. E. Whitford ◽  
P. Swings
Keyword(s):  
Infrared Radiation ◽  
Molecular Nitrogen ◽  
Night Sky

A large rotating structure around AB Doradus A at VLBI scale

2019 ◽  
Vol 15 (S354) ◽  
pp. 189-194
Author(s):  
J. B. Climent ◽  
J. C. Guirado ◽  
R. Azulay ◽  
J. M. Marcaide
Keyword(s):  
Magnetic Reconnection ◽  
Main Sequence ◽  
Complex Structure ◽  
Main Sequence Star ◽  
Polar Cap ◽  
Vlbi Observations ◽  
Rotating Structure ◽  
Source Structure ◽  
Expected Position

AbstractWe report the results of three VLBI observations of the pre-main-sequence star AB Doradus A at 8.4 GHz. With almost three years between consecutive observations, we found a complex structure at the expected position of this star for all epochs. Maps at epochs 2007 and 2010 show a double core-halo morphology while the 2013 map reveals three emission peaks with separations between 5 and 18 stellar radii. Furthermore, all maps show a clear variation of the source structure within the observing time. We consider a number of hypothesis in order to explain such observations, mainly: magnetic reconnection in loops on the polar cap, a more general loop scenario and a close companion to AB Dor A.

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