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SUMMARY:Pc3 pulsations during low density events
DTSTART;VALUE=DATE-TIME:20110715T071500Z
DTEND;VALUE=DATE-TIME:20110715T073000Z
DTSTAMP;VALUE=DATE-TIME:20260418T163930Z
UID:indico-contribution-5190@events.saip.org.za
DESCRIPTION:Speakers: Stefan Lotz (SANSA: Rhodes University)\nWe study the
  generation of Pc3 geomagnetic pulsations (22 – 100 mHz) measured at Tih
 any\, Hungary during intervals of very low solar wind (SW) proton density 
 (low density events - LDE’s) when Np ~ 1/cc. We know the main SW based d
 rivers of Pc3's are SW velocity and interplanetary magnetic field (IMF) di
 rection. However\, it is observed that under very low SW density pulsation
  activity measured on the ground is paused\, regardless of otherwise favou
 rable conditions. A simple statistical study is performed to show the depe
 ndence of pulsation activity on Np\, and we estimate a threshold Np\, belo
 w which pulsations cease. Furthermore we use the growth rate of the ion be
 am instability\, that generates the ULF waves upstream of the bow shock (w
 hich drive Pc3's)\, to explain the observed dependence of Pc3 pulsations o
 n solar wind density.\n\nhttps://events.saip.org.za/event/7/contributions/
 5190/
LOCATION: Acro2
URL:https://events.saip.org.za/event/7/contributions/5190/
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