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Corrigendum to “Hydrostatic equilibrium and convective stability in the plasmasphere”

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Journal of Atmospheric and Solar-Terrestrial Physics 63 (2001) 2007

www.elsevier.com/locate/jastp

Corrigendum

Corrigendum to “Hydrostatic equilibrium and convective stability in the plasmasphere”

[Journal of Atmospheric and Solar-Terrestrial Physics 61 (1999) 867–878]

J.F. Lemaire

∗

Institut d’ Aeronomie Spatiale de, Belgique, 3 Avenue Circulaire, B-1180 Brussels, Belgium

This 3gure replaces Fig. 4 of p. 872 in the article re- ferred above. Although the instability thresholds are the same in both 3gures, the shadings have been corrected for L ¿ L0= 6:6: The new3gure con3rms that a corotating protonosphere in hydrostatic=barometric equilibrium be- comes convectively unstable beyond this equatorial distance (i.e. geosynchronous orbit).

Beyond this radial distance, both pure interchange plasma motions (as described by Gold, 1959; Tserkovnikov, 1960) and quasi-interchange plasma motions (as described by Newcomb, 1961) are unstable for any (negative) density slope=gradient larger than the values given by the dashed and dotted lines, respectively: i.e. when the density scale height within an embedded volume element is smaller than the threshold values corresponding to the dashed and dotted lines, respectively.

The legend of this newFig. 4 is unchanged, as well as the text of the article itself, except for a typographical error on p. 871 (line 7 in the column of the right-hand side) where

−d lnm=dzshould be replaced by−d lnn=dz.

From this new3gure it is clear that the geosynchronous distance is a crossover location where any negative density slope becomes convectively unstable with respect to both convective instabilities in a corotating protonosphere or plas- masphere in hydrostatic=barometric equilibrium. Note that the e?ect ofB-3eld line curvature on these stability criteria will be addressed in a paper currently in preparation.

PII of the original article: S1364-6826(99)00044-9

∗Tel.: +32-2-373-0407; fax: +32-2-374-8423.

E-mail address:[email protected] (J.F. Lemaire).

Fig. 4.

Acknowledgements

I Wish to thank Dr. Vladimir Cadez for pointing out to me the mistake in the former Fig. 4.

1364-6826/01/$ - see front matter c2001 Elsevier Science Ltd. All rights reserved.

PII: S1364-6826(01)00076-1

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