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2009 WD schedule

World Day schedule for 2009

2009 Incoherent Scatter Coordinated Observation Days

Data collection on these Incoherent Scatter Coordinated Observation Days is to start no later than 1600 UT on the indicated day. (Since setup and warmup times vary from site to site, appropritate re-configuration time must be scheduled prior to this time so that data is actually being acquired by 1600 UT.)

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.


2009 Incoherent Scatter Coordinated Observation Days
***First Draft for Publication***

Month Starting
Length (days)
New Moon Experiment
January 8 1-1/3 26 IPY
January 22 1-1/3 26 IPY
February Alert 10 25 Stratospheric warmings...see note 1
February 4 1-2/3 25 TID+IPY
February 19 1-1/3 25 IPY
March 24 1-2/3 26 Synoptic

May 12 1-2/3 24 TID
June 22 1 22 Meteor
June 23 1-2/3 22 PMSE


Alert 10 18 Wind reversals..see note 2
15 1-2/3 18 TID


December 7 5-2/3 16 TEC + SolarWindEffects
29 (23 1/3)
23 1/3 days are global, 29 days polar radars
1: The decision to start will be based on predictions of stratospheric warming by Larisa Goncharenko.
2: Will only be run if Stratospheric Warming alert do not run. The decision to start will be based on transition indicators by Larisa Goncharenko and Peter Hoffmann.
Schedule last updated: Monday, 7 October 2008

Real-Time Data Links (when available)

Jicamarca Arecibo Millstone Hill Sondre Stromfjord EISCAT
Kharkov Irkutsk MU SuperDARN

Send comments, questions and proposals for the World Day schedule to to Ingemar Haggstrom at and to Mary McCready at

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 2008 can be found at

Procedures for requesting World Day experiments

Instructions and guidlines for submitting World Day proposals are available at:
A template for the the 2010 World Day schedule will be available at:
A sample proposal for requesting special World Days will be available at:

Notes on World Day observations proposed for 2009

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 2009 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.

Wind reversals: Temporal development of wind reversals and temperature of the lower and upper thermosphere during equinox transistion

Key Objectives:
  • Measure wind, electron and ion temperatures
  • Examine energy deposition derived from mesospheric radars
  • Examine factors responsible for circulation change
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.
Scheduling:This experiment would only run in the Fall if the Stratospheric Warming 10-day request was not run in January or February
Participant Duties: Larisa Goncharenko is responsible for issuing the alert. Peter Hoffmann will coordinate MF and meteor radar data. Contacts: Larisa P. Goncharenko, Peter Hoffmann

QP TIDs: Coordinated Study of Quasi-Periodic Medium-Scale Traveling Ionospheric Disturbances with Extended Latitude Coverage

Key Objectives:
  • To determine whether gravity-wave induced medium-scale traveling ionospheric disturbances (MSTIDs) consistently observed at high geomagnetic latitudes under quiet geomagnetic conditions are at all related to the continuum of quasi-periodic thermospheric waves observed at both Arecibo, Millstone, and perhaps AMISR Poker Flat.
  • To Firmly establish the geophysical parameter range over which these quasi-periodic MSTIDs�that currently appear to defy theoretical explanation�exist.
Background Conditions: Low to moderate geomagnetic activity, New Moon.
ISRs Needed: All, for three 48-hour runs.
Parameters to Measure: Continuous or near-continuous vertical power profiles through the E/F regions (100-800 km) with the best time resolution possible. We must have 5 minute or better time resolution power profiles in order to properly filter the data to separate small amplitude waves from the normal variations of the ionosphere.
Secondary Parameters to Measure: Dual-beam ion velocities commensurate with the primary objective.
Simultaneous Data: As the waves sought for this study are known to exist at AO, MSH, and PFISR, simultaneous data are needed to further study the waves and identify the generative processes.
Participant Duties: John Mathews will coordinate the observations to ensure that proper modes are used at each UAF.
Contact: J.D. Mathews, F.T. Djuth, D. Livneh, I. Seker, M.P. Sulzer, C.A. Tepley, S.M. Smith, W.A. Bristow, J.C. Foster, and M. Nicolls.

TEC Mapping: ISR/GPS Coordinated Observations of Electron Density Variations

Key Objectives:
  • To study latitudinal variations of the ionosphere in the American longitude sector, in particular, the plasmaspheric boundary layer behavior.
  • To examine time and latitudinal variations of electron content in the plasmasphere.
  • To test the GPS TEC mapping function.
Background Conditions: A range of magnetic activity is preferred but not required. A similar campaign in 2007 March 1-5 during quiet magnetic conditions produced the dataset that was reported at the International Beacon Symposium, the national URSI meeting, and the Fall 2007 AGU meeting. A 5-day summer campaign is scheduled for July 8-13. For 2009, a winter 5-day period is desired. We plan similar experiments for years ahead so that we can pick up different months for different years under differing solar and geophysical conditions. ISR modes should be the same as for the previous ISR/GPS experiments.
ISRs Needed: All.
Parameters to Measure: Standard ISR basic parameters, e.g., Ne, Ti, Te and line-of-sight ion velocity Vo.
Inferred parameters, such as meridional thermospheric winds and local electric fields, are desirable at least for Millstone Hill.
For our analysis, we need good height coverage and height/range resolution. The idea is to have a good ISR profile for both the bottomside and topside. Our intent is to determine the plasmaspheric content from the difference between the GPS TEC and the integrated ISR electron content. Because of this, the value of the F2 peak, and of the electron density above and below it, are very important for our analysis. Using a single very long pulse to make ISR measurements may result in significant smearing effects and would cause measurements below 200 km unusable for our study. We suggest either a short pulse with a long dwell (integration) time or a long pulse with interleaved Alternating Code. A time resolution of up to 30 min is acceptable.
We will use Millstone Hill's zenith and MISA data, taken almost simultaneously, to test how the slant TEC is mapped to the vertical TEC. So both local measurements and wide coverage are requested. The elevation scan is preferred.
For high latitude sites, we prefer elevation scans towards the South. First, that would generate line-of-sight TEC that can be compared with GPS TEC (few GPS satellites are overhead or in the north at high latitudes). Second, in the American Sector, combined Millstone and Sondrestrom data could provide good latitudinal coverage over subauroral and auroral areas.
For other sites, vertical observations would be fine. We ask for high altitude measurements from Arecibo.
Simultaneous Data: Simultaneous data is needed to study latitudinal variations.
Participant Duties: Anthea Coster and Shunrong Zhang will coordinate the experiment to ensure proper modes are used and will be responsible for the scientific analysis. Anthea Coster will also be responsible for processing the GPS TEC data for all sites.
Contacts: Shun-Rong Zhang, Anthea Coster.

C/NOFS: Communications / Navigation Outage Forecasting System

The primary purpose of C/NOFS is to forecast the presence of ionospheric irregularities that adversely impact communication and navigation systems through
(1) improved understanding of the physical processes active in the background ionosphere and thermosphere in which plasma instabilities grow;
(2) the identification of those mechanisms that trigger or quench the plasma irregularities responsible for signal degradation; and
(3) determining how the plasma irregularities affect the propagation of electro-magnetic waves.
A new satellite was launched in April of 2008 into a low inclination (13�), elliptical (~ 400 x 700 km) orbit that is solely dedicated to the C/NOFS objectives. It is equipped with sensors that measure ambient and fluctuating electron densities, ion and electron temperatures, AC and DC electric fields, magnetic fields, neutral winds, ionospheric scintillations, and electron content along the lines of sight between C/NOFS and the Global Positioning System (GPS) satellite constellation. The orbit has a 45-day repeating precession. Complementary ground-based measurements including the Jicamarca and Altair radars are critical to the success of the mission. Coordination with the World Days periods and satellite overpasses will continue throughout 2009. (Requests for additional UAF radar time beyond the currently scheduled World Days are to be made directly to the respective observatory staffs based on actual orbital characteristics.) Contacts: Odile de La Bedaujardiere, David Hysell, Wes Swartz

PMSE: International PMSE Intervals

Key Objectives:
  • Global polar
Special needs: June-August
Comments:Polar phenomena, run at EISCAT, PFISR and RISR.
Contact: Ian McCrea

Terrestrial effects: Terrestrial effects of solar wind processes

Key Objectives:
  • Measure effects of
  • equatorial solar coronal holes
  • fast solar streams
  • CME:s
  • solar flares
Special needs: Select observing dates one month in advance
Comments: This one can be combined with the ISR/GPS (#3 TEC mapping) run, especially because the TEC mapping planners would love to catch a storm in their 5-day run.
Contact: Alexis Rouillard, Chris Davis, Ivan Finch, and Ian McCrea

Meteors: Global Measurements of the Meteor Input Function

Key Objectives:
  • Measure micrometeor input function
  • Geographical, seasonal, diurnal behavior
Special needs:One period near a solstice
Comments:Radar modes required may not provide the standard ISR parameters. Can be run as piggyback to a normal D-region experiment, with added voltage-level data.
Contact:John Plane and Diego Janches


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: Wes Swartz, Jan Sojka.

IPY: Continuation of 2nd International Polar Year bi-weekly runs

Key Objectives:
  • To provide an unprecedented data set with multiple applications.
  • To provide correlative data for other instrumentation and models committed to the IPY.
ISRs Needed:Polar radars: EISCAT, Sondrestrom, PFISR, RISR
Parameters to Measure: Standard.
Further information: Link.
Contact: Tony van Eyken.
Updated Monday, 7 October 2008 by Ingemar Haggstrom, Chairman of the URSI Incoherent Scatter Working Group.