Some Observations on the Nitrogen First Negative System

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).

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Determination of the square of the matrix element for the dipole moment of the electronic transition in the first negative system of N 2 +

Journal of Applied Spectroscopy ◽

10.1007/bf00606144 ◽

1967 ◽

Vol 7 (2) ◽

pp. 164-167

Author(s):

V. N. Egorov ◽

L. N. Tunitskii

Keyword(s):

Dipole Moment ◽

Matrix Element ◽

Electronic Transition ◽

The Matrix ◽

Negative System

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ICP Rotational Spectroscopic Temperature Determination Using N2 and N2+

Applied Spectroscopy ◽

10.1366/0003702874448508 ◽

1987 ◽

Vol 41 (4) ◽

pp. 658-660 ◽

Cited By ~ 8

Author(s):

C. J. Seliskar ◽

D. C. Miller ◽

P. A. Fleitz

Keyword(s):

Computer Program ◽

Rotational Structure ◽

Positive System ◽

Temperature Determination ◽

Negative System

The rotational structure in the origin bands of the Second Positive System of N2 and the First Negative System of N2+ have been used to demonstrate that these bands can be employed to determine a consistent spectroscopic temperature in an ICP. The experimental spectra have been modeled by the use of a computer program which calculates these bands for both species.

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Topological Hopf bifurcation in the plane

Mathematical Proceedings of the Cambridge Philosophical Society ◽

10.1017/s0305004100060370 ◽

1983 ◽

Vol 93 (1) ◽

pp. 113-119

Author(s):

Dieter Erle

Keyword(s):

Hopf Bifurcation ◽

Dynamical Systems ◽

Asymptotic Stability ◽

Stationary Point ◽

Parameter Family ◽

Stability Behaviour ◽

Closed Orbits ◽

The Stability ◽

Image Position ◽

Negative System

Classical bifurcation theorems for a 1 -parameter family of plane dynamical systemsassert the presence of closed orbits clustering at some distinguished parameter value (∈ = 0, say). Here, for any ∈, the origin is the only stationary point. The topological content of the mostly analytic hypotheses imposed is some change in the stability behaviour of the origin at ∈ = 0, roughly the passing of a kind of stability to a kind of instability. Topologically speaking, e.g. some of the conditions demanded are asymptotic stability of the origin for the negative system at ∈ > 0 and asymptotic stability of the origin for at ∈ < 0 (Hopf (8), Ruelle and Takens(11)) or ∈ = 0 (Chafee(2)).

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