Electronically excited molecular nitrogen and molecular oxygen in the high-latitude upper atmosphere

A. S. Kirillov
2008 Annales Geophysicae  
<p><strong>Abstract.</strong> Relative vibrational populations of triplet <I>B</I><sup>3</sup>&amp;Pi;<sub><I>g</I></sub>, <I>W</I><sup>3</sup>&amp;Delta;,sub><I>u</I></sub>, <I>B</I><sup>'3</sup>&amp;Sigma;<sub><I>u</I></sub><sup>&amp;minus;</sup> states of N<sub>2</sub> and the <I>b</I><sup>1</sup>&amp;Sigma;<sub><I>g</I></sub><sup>+</sup> state of O<sub>2</sub> are calculated for different altitudes of the high-latitude upper atmosphere during auroral electron precipitation. It is shown that
more » ... n. It is shown that collisional processes cause a wavelength shift in the distribution of relative intensities for 1PG &amp;Delta;<I>v</I>=3 sequence of N<sub>2</sub>. The calculation of relative populations for vibrational levels <I>v</I>=1&amp;ndash;5 of the <I>b</I><sup>1</sup>&amp;Sigma;<sub><I>g</I></sub><sup>+</sup> state in the auroral ionosphere has not given an agreement with experimental results. Preliminary estimation of the contribution of the reaction O<sub>2</sub><sup>+</sup>+NO to the production of O<sub>2</sub>(<I>b</I><sup>1</sup>&amp;Sigma;<sub><I>g</I></sub><sup>+</sup>) on the basis of a quantum-chemical approximation does not allow for an explanation of the observable vibrational population of the <I>b</I><sup>1</sup>&amp;Sigma;<sub><I>g</I></sub><sup>+</sup> state in the aurora.</p>
doi:10.5194/angeo-26-1159-2008 fatcat:44pi4eifcnajzavookgdesonhu