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Wide-Latitude Substorm Study - April 27-29, 1998

Experiment Overview

Post-Event Analysis

Millstone Hill WLS98 Observations

Diagnostic Data

UARC April 98 Campaign

Realtime Data

John Foster's Homepage

WLS97 Campaign (April 97)

WLS 98: Hot News

WLS98 campaign interval begins with X-ray flare and related activity during WLS98 campaign interval
Substorm on 04/27-28 was imaged over Antarctica by DMSP F13
Substorm on 04/28-29 was observed over Antarctica by DMSP F13 imager substorm development and substorm decay
DISTURBED interval: ACE solar wind ions 04/28-05/04/98
DISTURBED interval: major storm follows WLS interval
Geomagnetic Response to solaw wind impulse seen by ACE (05/15/98)

WLS 98: Overview

The Wide-Latitude Substorm Study has been organized by the NSF/UAF community as a research interval directed towards providing distributed observations of ionospheric parameters and electrodynamics through coordinated incoherent scatter radar (ISR) observations during active conditions. This WLS experiment uises a fixed operating schedule and the dates have been pre-selected for the interval April 27-29, 1998.
A very-successful WLS campaign was conducted in April 1997 ( WLS97) and provided extensive observations of a storm sequence which resulted in visible ionospheric effects of the northern US.
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Post-Event Analysis

WLS 98 involved the global array of incoherent scatter radar facilities operating as a part of the ISR World Day program. Links to the radar facilities are found through the interactive map of incoherent scatter radar stations
Moderate geomagnetic disturbance resulted the effects of teh x-ray flare on April 27th and the radar experiments continued through mid-day on May 1, 1998.
As segments of the the data are examined in detail, preliminary descriptions of events of interest will be posted in the following list:

Azimuth scan density and velocity maps during substorm at the end of 04/28/98.
IMF Southward turning at 18 UT during substorm at the end of 04/28/98.
Observations of Storm-Enhanced Density (SED) during substorm at the end of 04/28/98.
Description of Millstone observations and formation of trough during substorm at 01 UT on 04/28/98.
A series of coronal mass ejections impacted the magnetosphere during the interval 04/28-05/04/98
Following the conclusion of WLS98 a major geomagnetic storm occurred 05/02-04/98.
Millstone observations resumed on May 4th. A polar disturbance was seen in a sequence of POLAR UVI images near 17 UT on 05/04 in conjunction with high-latitude goemagnetic disturbance.

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Millstone Radar WLS98 Observations

Millstone position mode velocities to east and west at 15 deg EL
Local F region above Millstone April 27-28
Thermospheric wind pattern from Millstone All-Sky Imaging FPI at April 28 @ 05 UT
Variation of electron density with latitude during 4 days of WLS98
Variation of ion temperature with latitude during 4 day of WLS98
Variation of electron temperature with latitude during 4 day of WLS98
Sequence of Elscans showing trough formation during 04/27-28 substorm 23:15UT; 00:40UT; 01:255UT; 02:105UT;

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Representative Diagnostic Data

Ap Index for interval leading up to WLS98 campaign
April 1998 Dst Index
Canopus magnetometer RT observations Ft. Churchill 04/23-24/98
Sodankyla magnetometer RT observations 04/23-24/98
ACE SWE observations thru April 22-24, 1998
ACE SWE observations thru April 25-27, 1998
ACE solar wind protons April 22-27, 1998
ACE IMF data April 23-27, 1998
WIND solar wind protons April 20-May 02, 1998
WIND IMF April 27-May 1, 1998
WIND IMF April 27-28, 1998
WIND IMF April 29-30, 1998
NOAA solar x-ray flux
NOAA summary plot of disturbance indices

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UARC/WLS98

WLS 98 will coincide with an extensive UARC scientific collaboratory. Preparations are being made to facilitate real-time data access and experimenter interaction using the UARC tools. More details on the UARC plans and preparations are available from Rick Niciejewski at U. Michigan (niciejew@engin.umich.edu) or through the UARC homepage. Real-time data feeds from the US and EISCAT ISRs will be in place to support the April 98 WLS and UARC activities.
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Real-Time Data Plots

Realtime data for the WLS98 experiment are being organized and displayed through the UARC pages and trough standard connections at a number of the instrument data servers. The Millstone Hill Madrigal database features Realtime Data from MHO Radar.

Millstone Radar Local F-Region Measurements
Latest Millstone elevation scan data
Latest Millstone azimuth scan data
Latest Millstone digisonde data
Real-time solar wind/IMF data from ACE through NOAA/SEC server
Real-time SuperDARN Convection Pattern
Canadian Magnetometer data from CANOPUS Chain
Latest Magnetometer data from Sodankyla
Current RT auroral image from POLAR UVI
Current RT auroral image from POLAR VIS
April 1998 Dst Index

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http://www.haystack.edu/~jcf/wls98.htm -- Revised: May 11, 1998.jcf@haystack.mit.edu