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World Day Schedule 2012

2012 Incoherent Scatter Coordinated Observation Days

Data collection on these Incoherent Scatter Coordinated Observation Days is to start no later than 1300 UT on the indicated day and stop not before 2000 UT the ending day. That means that an experiment scheduled for 1 day, actually runs for minimum 31 hours. Depending on local setups, it is recommended to extend the runs around the core hours to be sure to have the systems up at full power during the selected periods.

In the following table, columns 1 and 2 give the UT start dates of the experiments, column 3 lists the lengths of the experiments, column 4 shows the dates of new moon, and column 5 lists the experiment titles. See special notes associated with each World Day period.

2012 Incoherent Scatter Coordinated Observation Days

Month Starting
Length (days)
New Moon Experiment
January 15-31 Alert 10 23 Stratospheric warmings...see note 1
February 1-15 Alert 10 21 Stratospheric warmings...see note 1



June 12 3 19 Synoptic


4 3 16 Synoptic


December 11 3 13 Synoptic
Total 484 hours...see note 2
1: The decision to start will be based on predictions of stratospheric warming by Larisa Goncharenko. In the case of no SSW event, the World Day will fall back to a 5 day run at the end of the alert period, 7-12 Febr.
2: With start/stop times of 1300/2000 UT: 19*24h+4*7h=484h
Schedule last updated: 26 September 2011

Real-Time Data Links (when available)

Jicamarca Arecibo Millstone Hill Sondrestrom PFISR RISR-N EISCAT
Kharkov Irkutsk MU SuperDARN

Send comments, questions and proposals for the World Day schedule to Mary McCready or Ingemar Häggström

World Day Facts

Establishing "World Day" schedules for coordinating the operations of the incoherent scatter radars around the world is one of the activities of the Incoherent Scatter Working Group (ISWG) of Commission G of URSI. These schedules are published yearly as part of the International Geophysical Calendar. Here are some of the facts about world days:
  • World Days (WD) provide for coordinated operations of two or more of the incoherent scatter radars (ISRs) for some common scientific objective. (Experiments that require only 1 UAF should be set up separately and directly with those in charge of that UAF.)
  • World Days should be scattered throughout the calendar year.
  • World Day data is to be promptly submitted to the CEDAR database and/or made available through other online databases as appropriate.
The World Day Schedule for 2011 can be found at WD2011.htm

Procedures for requesting World Day experiments

Instructions and guidlines for submitting World Day proposals are available at: RequestingWD.doc.
A sample proposal for requesting special World Days will be available at:

Notes on World Day observations proposed for 2012

Strat-Warming: Dynamics and Temperature of the Lower Thermosphere During Sudden Stratospheric Warming

Key Objectives:
  • To measure neutral wind (zonal and meridional components) and electron and ion temperatures in the lower thermosphere before and during sudden stratospheric warming.
  • To compare variations in temperature and winds to average variations observed by ISRs during the winter.
  • To compare variations in temperatures and winds to mesospheric response as given by MF and meteor radars and lidars.
  • To extend studies of stratospheric warming effects to the lower thermosphere and investigate possible coupling with the ionosphere
  • To examine the mechanisms responsible for variations in lower thermospheric dynamics and temperatures and investigate to what degree they can be related to sudden stratospheric warming.
Background Conditions: The observations need to be made before and during the sudden stratospheric warming. A 10-day campaign is requested, based on an alert to be issued either in January or February.
ISRs Needed: All
Parameters to Measure: LTCS mode - electron and ion temperatures from lowest possible altitude throughout the F-region, zonal and meridional components of neutral wind in the lower thermosphere (95-140km), F-region meridional wind. Temporal resolution can be sacrificed and data integration period increased in order to obtain data at lower altitudes.
Need for Simultaneous Data: The idea is to measure how variations in temperature and winds associated with sudden stratospheric warmings change with latitude and altitude.
Scheduling: A month-long alert period in January or February 2012 is proposed. Initiation of observations will be based on NCEP and/or EMCWF forecasts of changes in stratospheric temperatures.
Participant Duties: Larisa Goncharenko is responsible for issuing the alert. Peter Hoffmann will coordinate MF and meteor radar data. Irfan Azeem will coordinate OH airglow temperatures. William Ward will facilitate collaboration between modeling, radar, and lidar efforts.
Contacts: Larisa P. Goncharenko, Peter Hoffmann, Irfan Azeem, and William Ward.


These synoptic experiments are intended to emphasize wide coverage of the F-region, with some augmented coverage of the topside or E-region to fill in areas of the data bases that have relatively little data.
Contact: Jan Sojka, Ingemar Häggström.
Updated Thursday, 26 September 2011 by Ingemar Häggström, Former chairman of the URSI Incoherent Scatter Working Group.