Effect of interplanetary shock strengths and orientations on storm sudden commencement rise times

2006 ◽  
Vol 33 (14) ◽  
Author(s):  
C. Wang ◽  
C. X. Li ◽  
Z. H. Huang ◽  
J. D. Richardson
Keyword(s):  
Interplanetary Shock ◽  
Sudden Commencement ◽  
Storm Sudden Commencement

scholarly journals Impact of interplanetary shock on the ULF wave activity: A case study of the storm sudden commencement on September 22, 1999

2001 ◽  
Vol 53 (12) ◽  
pp. 1177-1182 ◽  
Author(s):  
J. Kangas ◽  
J. Kultima ◽  
A. Guglielmi ◽  
A. Potapov ◽  
K. Hayashi
Keyword(s):  
Interplanetary Shock ◽  
Wave Activity ◽  
Sudden Commencement ◽  
Ulf Wave ◽  
Storm Sudden Commencement

scholarly journals Observations of ionospheric flows and particle precipitation following a Sudden Commencement

2000 ◽  
Vol 18 (8) ◽  
pp. 908-917 ◽  
Author(s):  
E. Nielsen ◽  
F. Honary
Keyword(s):  
Electric Fields ◽  
Interplanetary Shock ◽  
Sudden Commencement ◽  
Interplanetary Shocks ◽  
Particle Precipitation ◽  
Flow Modulation ◽  
Interplanetary Physics ◽  
Flow Speeds ◽  
Wind Spacecraft ◽  
Electric Fields And Currents

Abstract. On May 4, 1998, at 0227 UT an interplanetary shock crossed the WIND spacecraft, and half an hour later a Sudden Commencement occurred. Coinciding with the Sudden Commencement a rapid intensification of the flux of particle precipitation into the ionosphere was observed. Evidence is presented that the ionospheric electric fields were influenced by the associated dynamic variations of the ionospheric conductivities. Following the initial phase the ionospheric flow speeds increased rapidly over the next 20 min to more than 2000 m/s, in agreement with an increased effective coupling of the solar wind energy to the magnetosphere following the interplanetary shock that caused the Sudden Commencement. These strong flows were meandering in latitude, a type of plasma flow modulation that has been reported before to occur during Omega band events: a string of alternating field-aligned currents propagating eastward. The riometer absorption was found to be at a minimum in regions associated with outward directed field aligned currents. The riometer absorption regions (the regions of particle precipitation) were drifting  with E × B drift speed of the ionospheric electrons.Key words: Interplanetary physics (interplanetary shocks) - Ionosphere (electric fields and currents) - Magnetospheric physics (energetic particles, precipitating)

scholarly journals Global MHD test particle simulations of >10 MeV radiation belt electrons during storm sudden commencement

2007 ◽  
Vol 112 (A9) ◽  
pp. n/a-n/a ◽  
Author(s):  
B. T. Kress ◽  
M. K. Hudson ◽  
M. D. Looper ◽  
J. Albert ◽  
J. G. Lyon ◽  
...  
Keyword(s):  
Test Particle ◽  
Radiation Belt ◽  
Sudden Commencement ◽  
Storm Sudden Commencement ◽  
Particle Simulations ◽  
Radiation Belt Electrons

Study on Ionospheric TEC Effect during the Magnetic Storm on August 5th,2011

2014 ◽  
Vol 577 ◽  
pp. 1193-1197
Author(s):  
Shu Hui Li ◽  
Jun Huan Peng ◽  
Shu Qing Wang ◽  
Yun Peng
Keyword(s):  
Magnetic Storm ◽  
Local Time ◽  
High Latitude ◽  
Reference Value ◽  
Sudden Commencement ◽  
Spatial Gradient ◽  
Low Latitude ◽  
Maximum Increase ◽  
Storm Sudden Commencement ◽  
Gps Station

Using GPS observations, this article studied the global TEC’s effect and its variation characters during the magnetic storm on August 5th, 2011. Results show that after sudden commencement and deep main phase of the magnetic storm, there are strong positive ionospheric TEC disturbances in the area along middle and low latitude with local time of 12:00 at noon. Besides, compared with TEC reference value, the maximum increase values are respectively 21.26 TECU and 25.29 TECU. TEC’s abnormal decline appeared in some area of high latitude at mid night on the northern semi-sphere. The analysis results reflect that the ionospheric disturbances are dependent on the local time. Moreover, observations on the BRMU GPS station show that the rate of TEC (ROT) rose and fell quickly, and its standard deviation ROTI index increased from less than 0.5 TECU/min to lager than 1.5 TECU/min, which meant that TEC temporal and spatial gradient had become larger and larger during the storm. The global ROTI map reflects the strong irregularity of the ionosphere density structure in the high-latitude area with higher time resolution in case of storm sudden commencement, and the maximum value rose up to 6 TECU/min. Then, the ionospheric irregularity appeared in wide area of the globe after noon.

scholarly journals On latitudinal profile of Storm Sudden Commencement in H, Y and Z at Indian Geomagnetic Observatory chain

2001 ◽  
Vol 53 (2) ◽  
pp. 121-127 ◽  
Author(s):  
R. G. Rastogi ◽  
B. M. Pathan ◽  
D. R. K. Rao ◽  
T. S. Sastry ◽  
J. H. Sastri
Keyword(s):  
Sudden Commencement ◽  
Geomagnetic Observatory ◽  
Storm Sudden Commencement ◽  
Latitudinal Profile
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