Ion composition of substorms during storm-time and non-storm-time periods

Details Ion composition of substorms during storm-time and non-storm-time periods Ion composition of substorms during storm-time and non-storm-time periods

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64..561k&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 5-6, p. 561-566.

Physics

9

Scientific paper

The oxygen to hydrogen ratio (O+/H+) is investigated for storm-time substorms (Dst=-195nT) and for substorms in absence of storms (non-storm-time substorms) (Dst>=-30nT). For this study we use CRRES particle and electric field data as well as indicators for storm (Dst) and substorm (AE) activity and the IMF Bz-component from IMP-8. Injection of particles into the inner magnetosphere during storms and substorms is consistent with enhanced convection caused by large-scale storm-time or dipolarization dawn-dusk electric fields in the near-Earth magnetotail. The strength of this convection is related to the magnitude and duration of the negative IMF Bz, which are both larger for storm-time substorms than for non-storm-time substorms. Non-storm-time substorms lead to only minor ring current enhancements at large /L-values (/L=5.0-7.0), while storm-time substorms can contribute the main ring current. During storms the ring current maximum can move in as far as /L=3 from its quiet time position at /L=4.5. Storm-time substorms have O+/H+ ratios of several 100%, whereas non-storm-time substorms show an O+/H+ ratio between 15% and 65%. The obvious composition difference between storm-time and non-storm-time substorms indicates that during storms one or a combination of the following factors play a role: (1) oxygen ions are preferentially accelerated/transported in the plasma sheet, (2) pre-storm conditions lead to a large reservoir of oxygen ions tailward of the oxygen trapping boundary, or (3) polar ionospheric outflow is enhanced leading to an increased convection source of oxygen ions.

Affiliated with

Also associated with

No associations

Rating

Ion composition of substorms during storm-time and non-storm-time periods does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Ion composition of substorms during storm-time and non-storm-time periods, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ion composition of substorms during storm-time and non-storm-time periods will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-784012