Ground disturbances of the ring, magnetopause, and tail currents on the day the solar wind almost disappeared

Details Ground disturbances of the ring, magnetopause, and tail currents on the day the solar wind almost disappeared Ground disturbances of the ring, magnetopause, and tail currents on the day the solar wind almost disappeared

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10625529j&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A11, p. 25529-25540

Physics

5

Magnetospheric Physics: Current Systems, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Ring Current, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

We study ring current dynamics on a day of exceptionally low solar wind density (of ~0.1 cm-3). Inner magnetospheric measurements of geomagnetic activity show geomagnetic quiet par excellence. On May 11, 1999, the values were |Dst|<10nT and Kp=0+. The field at geostationary orbit was very close to dipolar. We simulate the global evolution of the ring current ion population during this period and compare the effect of the magnetopause, ring, magnetotail, and field-aligned currents on the Dst index. Measured H+, He+, and O+ energy and pitch angle distributions by the Magnetospheric Ion Composition Spectrometer (MICS) and HYDRA instruments on Polar on May 9 are used as initial conditions for our kinetic model. Comparing model results with Polar data on May 11, we find remarkable agreement, proving the applicability of our model for these magnetospheric conditions. We compare modeled H+ and He+ ion distributions with quiet time ring current distributions inferred from statistical studies, and we find that as a general trend, the simulation results have lower values than the statistical patterns. The ground magnetic field disturbances due to the ring and the magnetopause currents decrease quasi-monotonically on May 11, reaching limiting magnitudes of ~5 and ~3 nT, respectively. These values are substantially smaller than the ~20 nT quiet time values obtained from statistical studies.

Affiliated with

Also associated with

No associations

Rating

Ground disturbances of the ring, magnetopause, and tail currents on the day the solar wind almost disappeared 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 Ground disturbances of the ring, magnetopause, and tail currents on the day the solar wind almost disappeared, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ground disturbances of the ring, magnetopause, and tail currents on the day the solar wind almost disappeared will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1555071