Some solar cycle phenomena related to the geomagnetic activity from 1868 to 1980. I - The shock events, or the interplanetary expansion of the toroidal field

Details Some solar cycle phenomena related to the geomagnetic activity from 1868 to 1980. I - The shock events, or the interplanetary expansion of the toroidal field Some solar cycle phenomena related to the geomagnetic activity from 1868 to 1980. I - The shock events, or the interplanetary expansion of the toroidal field

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...152..199l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 152, no. 2, Nov. 1985, p. 199-204.

Astronomy and Astrophysics

Astrophysics

28

Interplanetary Medium, Magnetic Storms, Shock Waves, Solar Cycles, Solar Terrestrial Interactions, Cosmic Rays, Geomagnetic Pulsations, Solar Wind

Scientific paper

According to our previous analysis (Legrand and Simon, 1981), during 74% of the days the geomagnetic activity is the result of a steady wind flow occurring in the ecliptic plane. The present paper examined the remaining activity that we call the "transient activity" in order to separate the shock-events from a fluctuating wind flow supposed to be the two respective sources of that activity. We discussed a method of event recognition applied to the shock-event activity identified, on a Bartels diagram, by a SSC followed by a 3 day-jump of the geomagnetic activity level. Comparing our selected events with the ones obtained from the study of a series of solar wind data, we obtained a good agreement between both series. During the 112 year-interval under study, the shock-events contributed weakly to the geomagnetic activity (15%) during 8.5% of the days. Their rough relationship with the sunspot activity is rather weak (aa =0.048 R) and shows a large scattering on annual as well as on cyclical data. Outstanding jumps of shock-event activity occur currently once or twice a cycle, 2 years apart during the polar field reversal but not during the weakest cycles, i.e. those with a sunspot maximum number inferior to 50.

Affiliated with

Also associated with

No associations

Rating

Some solar cycle phenomena related to the geomagnetic activity from 1868 to 1980. I - The shock events, or the interplanetary expansion of the toroidal field 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 Some solar cycle phenomena related to the geomagnetic activity from 1868 to 1980. I - The shock events, or the interplanetary expansion of the toroidal field, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Some solar cycle phenomena related to the geomagnetic activity from 1868 to 1980. I - The shock events, or the interplanetary expansion of the toroidal field will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-977496