Polar Cap Convection/Precipitation States During Earth Passage of two ICMEs at Minimum of Solar Cycle 23

Details Polar Cap Convection/Precipitation States During Earth Passage of two ICMEs at Minimum of Solar Cycle 23 Polar Cap Convection/Precipitation States During Earth Passage of two ICMEs at Minimum of Solar Cycle 23

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh11a1484s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH11A-1484

Physics

[2111] Interplanetary Physics / Ejecta, Driver Gases, And Magnetic Clouds, [2463] Ionosphere / Plasma Convection, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [3354] Atmospheric Processes / Precipitation

Scientific paper

We report important new aspects of polar cap convection and precipitation (dawn-dusk and inter hemisphere asymmetries) associated with IMF By forcing of the magnetosphere by two interplanetary (IP) magnetic clouds during the recent minimum of solar cycle 23. The convection/precipitation states are documented by DMSP spacecraft and SuperDARN radars. Focus is placed on two intervals of southward magnetic cloud field with large negative By components and with high and low plasma densities, respectively, as detected by spacecraft Wind. The (negative) By component of the cloud field is accompanied by a newly-discovered flow channel (FC 2) threaded by old open field lines (polar rain precipitation) at the dusk and dawn sides of the polar cap in the northern and southern hemispheres, respectively, and a corresponding Svalgaard-Mansurov (S-M) effect in ground magnetic deflections. The latter S-M effect in the northern winter hemisphere appears in the form of a sequence of six 5-10 min long magnetic deflection events in the 71-74 deg MLAT/1430-1600 MLT sector. The presence of a lobe cell and associated polar arcs in the southern (summer) hemisphere in the low density (1-2 cm{-3}) ICME is accompanied by the dropout of polar rain precipitation in the dusk-side regime of sunward polar cap convection and inward-directed Birkeland current. The low-altitude observations are discussed in terms of momentum transfer via dynamo processes in the high- and low-latitude boundary layers and Birkeland currents located poleward of the traditional R1-R2 system.

Affiliated with

Also associated with

No associations

Rating

Polar Cap Convection/Precipitation States During Earth Passage of two ICMEs at Minimum of Solar Cycle 23 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 Polar Cap Convection/Precipitation States During Earth Passage of two ICMEs at Minimum of Solar Cycle 23, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polar Cap Convection/Precipitation States During Earth Passage of two ICMEs at Minimum of Solar Cycle 23 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1781228