Disclaimer: The following material is being kept online for archival purposes.

Although accurate at the time of publication, it is no longer being updated. The page may contain broken links or outdated information, and parts may not function in current web browsers.

ISTP Sun-Earth Connections Event Banner

4-7 April 2000

      Solar Observations from SOHO

      April 04, 2000

      SOHO Celias/MTOF Proton Monitor

      Geotail Data

      GOES Data

      WIND Data

      ACE Data

      Disturbed Storm Time Index Plot


      SuperDARN Convection Movie

      British Antarctic Survey Data

      Plots from Dynasonde, Magnetometer, Riometer, VLF receiver, SHARE radar and TULA ASC

      Geosynchronous Particle Data

      CANOPUS Magnetometer Data

      ISTP Theory Movies

      NOAA Satellite Environment Plot

April 4-7 EVENT SUMMARY - in progress

From Simon Plunkett (SOHO/LASCO)

LASCO and EIT observed a full halo event on 2000/04/04. The CME was first observed in a C2 frame at 16:32 UT, following a data gap of about ninety minutes. The leading edge of the CME had already left the C2 field of view at this time. Measurements in C3 indicate a plane-of-sky speed of 984 km/s at PA 260 (W limb). The event was brightest and most structured over the West limb, where a bright core was observed behind the leading edge. The appearance was more diffuse and fainter in the east.

EIT observed a C9 flare in AR 8933 (N18 W58) at 15:24 UT, that was probably associated with this flare. A large area of dimming between AR 8933 and AR 8935 (S07 W34) was also observed in EIT around the same time.

From Mike Kaiser (WIND/WAVES)

WAVES observes a continuation of the metric type II in the frequency range from about 9 to 14 MHz between 15:45 and 16:00.

San Vito reported an intense type IV at about the same time as the WAVES event, so it is possible that we just observed the low frequency extent of the type IV.


GEOPHYSICAL ACTIVITY FORECAST: The Geomagnetic field is expected to be at strong storm levels for much of April 6-7, 2000. The field is expected to return to unsettled levels by the end of the period.

From Daniel Berdichevsky

Strong IP shock was observed by ACE-NRT (~250RE UPSTREAM OF EARTH) at ~1600UT, Apr. 6, 2000 ACE-NRT observations with SWEPAM and MAG indicate a possible compression of a factor 4 at the time of the IP shock. SHock that appears related to the "C9/2F FLARE AT 04/1541UT" (4/4/2000).

From Don Fairfield

On April 6, 2000 Geotail detected the interplanetary shock arrival in the afternoon magnetosheath (Xse=8.7 Yse=10.5, Zse=-2.4) at 1639:55, which was 7 minutes 48 s after Wind detected the shock at 1632:07 at X=55.1, Y=39.4, Z=-6.1. (46.4Re/468s=632km/s which is slightly faster than the measured solar wind speed behind the shock.) Some 95 seconds after detecting the interplanetary shock in the magnetosheath, Geotail passed through the earthward moving bow shock (1641:30). Geotail measured 50-70 nT southward fields in the magnetosheath during the 6 hours following 1730 while Wind measured the approximately 20 nT southward interplanetary fields that produced the large magnetic storm. Geotail detected 7 additional bow shock crossings in the 70 minutes after the initial crossing and many more during the first 10 hours of April 7. Geotail moved into the magnetotail at about 1700 April 7 when the solar wind pressure abruptly decreased.

Other Links of Interest:

Author and curator:

Official NASA Contact: ISTP-Project
/ NASA Home / Goddard Space Flight Center Home /
Last Updated: 04/21/00

Above is background material for archival reference only.

NASA Logo, National Aeronautics and Space Administration
NASA Official: Adam Szabo

Curators: Robert Candey, Alex Young, Tamara Kovalick

NASA Privacy, Security, Notices