Updating List of Events during Space Weather Month

22-23 September 1999 Magnetic Activity

 

Kp from SEC

 

ACE Real-Time Observations

(99/09/22 18:30 UT)

  • Shock Observed by ACE at 11:30 UT on 99/09/22.
  • Sudden Impulse at 12:20 UT
  • Initial IMF Northward.
  • Solar Wind Density Has Reached 80 c.c. Currently 20 c.c. Velocity 500 km/s, Magnetic Field 25 nT

(99/09/22 20:00 UT)

  • ACE Observed IMF Turn South at 19:20 UTon 99/09/22. Currently at -20 nT
  • Solar Wind Density 15 c.c. Velocity 600 km/s, Magnetic Field 25 nT
  • Shock Observed by ACE at 11:30 UT on 99/09/22. Sudden Impulse at 12:20 UT

 

Kyoto real-time Dst

 

 

(99/09/23 05:45 UT)

  • Major Storm in Progress. Dst Has Reached -180 nT.
  • Kp Has Reached 7

16 September 1999 Magnetic Activity

 

Kp from SEC

  Kyoto real-time Dst

 

ACE Real-Time Observations

(99/09/15 23:00 UT)

  • Shock Observed by ACE and SOHO/MTOF at 19:40 UT on 99/09/15.
  • Sudden Impulse at 20:19 UT Initial IMF Northward

-- Ennio Sanchez

 NOAA POES

 

 

15 September 1999 Magnetic Activity

 

Kp from SEC

 Kyoto real-time Dst

 

Overview of NOAA POES Auroral Passes near maximum Kp on Sept 15.

 

ACE Real-Time Observations

(99/09/15 13:45 UT)

  • Shock Observed by ACE and SOHO/MTOF at 07 UT on 99/09/15
  • Initial IMF Southward. Kp has Reached 7

12-14 September 1999 Magnetic Storm

 From: Ennio R. Sanchez (14 Sept 99, 13:00 UT)

  • Minimum Dst of -90 nT at 02 UT on 99/09/13. Storm recovery in progress
  • ACE/EPAM fluxes started to increase again at 03 UT on 99/09/14
  • C4.9 X-ray event at 08 UT on 99/09/13. Source at AR 8699 (N22E10). No Type II, IV Reported. No Halo CME Reported
  • Period of 650+ km/s solar wind velocity observed starting at 02 UT on 99/09/14

 From: T. Obara (13 Sept 99)

  • An expected magnetic storm took place yesterday, it started at around 09UT and Dst reached its minimum at 11UT on Sept.12. Depth of Dst will be 150nT.
  • Solar wind velocity is still increasing and some follw-up magnetic disturbances will be strongly expected.
  • As shown in http://www.ips.oz.au/asfc/sramp.html, we have been expecting recurrent high speed stream should come on late Sept.12 or 13. Its arrival seems a little bit early
  • ...... I believe this major magnetic storm will be a good candidate in the Sapporo conference, we, therefore, timely announced it to enhance observations in our country

 From: Ennio R. Sanchez (12 Sept 99, 1630 UT)

  • Shock observed by ACE and SOHO at 03:15 UT on 99/09/12.
  • Sudden Impulse at 04:00 UT. Kp has reached value of 6 

Some Near Real-Time Observations: