Modeling the influence of changes in neutral atmosphere parameters on ionospheric electron density

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Abstract

Based on the modified numerical model of the ionosphere and plasmasphere developed at ISTP SB RAS, we calculated the height profiles of the electron density Ne for the quiet and disturbed thermospheric conditions of January 25, 2009 at the geographical location of Irkutsk (52.4N, 104.3E). The disturbed conditions were simulated by varying the neutral temperature T in the thermosphere. At heights below 180 km and above 250 km, with an increase/decrease in T, an increase/decrease in Ne occurs. At 180–250 km, the opposite pattern is seen: an increase/decrease in T causes a decrease/increase in Ne. The opposite pattern of the change in the Ne profile is associated with the influence of the atomic oxygen to molecular nitrogen density ratio [O]/[N2] at heights of the F-region. Quantitative estimates of the change in Ne at different heights with changes in the neutral temperature were obtained. It has been established that a change in T by 1 K leads to a change in Ne by 0.2–0.3%. The modeling results were compared with observations of the peak electron density NmF2 obtained with the Irkutsk ionosonde during the sudden stratospheric warming in January 2009.

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About the authors

G. A. Zherebtsov

Institute of Solar-Terrestrial Physics, Siberian Branch of the Russian Academy of Sciences

Email: pereval@iszf.irk.ru

Academician of the RAS 

Russian Federation, Irkutsk

A. V. Tashchilin

Institute of Solar-Terrestrial Physics, Siberian Branch of the Russian Academy of Sciences

Email: pereval@iszf.irk.ru
Russian Federation, Irkutsk

N. P. Perevalova

Institute of Solar-Terrestrial Physics, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: pereval@iszf.irk.ru
Russian Federation, Irkutsk

K. G. Ratovsky

Institute of Solar-Terrestrial Physics, Siberian Branch of the Russian Academy of Sciences

Email: pereval@iszf.irk.ru
Russian Federation, Irkutsk

I. V. Medvedeva

Institute of Solar-Terrestrial Physics, Siberian Branch of the Russian Academy of Sciences

Email: pereval@iszf.irk.ru
Russian Federation, Irkutsk

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2. Fig. 1. Altitude profiles of the electron concentration Ne calculated for the states of the thermosphere on 25.01.2009: quiet state (green lines, ΔT = 0), increased (red lines, Tn+ΔT) and decreased (blue lines, Tn-ΔT) values of exospheric temperature.

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3. Fig. 2. Relative deviations of the electron concentration Ne (a, b) and the concentration ratio [O]/[N2] (c, d) from the quiet state (ΔT = 0) with an increase (ΔT = +20, +60, +100 K) (a, c) and a decrease (ΔT = –20, –60, –100 K) (b, d) of the exospheric temperature for the conditions of 25.01.2009.

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4. Fig. 3. Zonal characteristics of the stratosphere over the Northern Hemisphere at a height of 10 hPa (about 32 km), 01.12.2008‒15.03.2009, according to MERRA-2 reanalysis data: lower panel – zonal mean (60‒90° N) temperature; upper panel – zonal mean (60° N) zonal wind.

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5. Fig. 4. Variations of NmF2, NmF2Med (upper panel) and ΔNmF2 (lower panel) from 22 to 31 January 2009.

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