2010 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 recomended 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.
2010 Incoherent Scatter Coordinated Observation Days
||Stratospheric warmings...see note 1|
||Stratospheric warmings...see note 1|
||Total 653 hours...see note 2||
1: The decision to start will be based on predictions of stratospheric warming by Larisa Goncharenko.
2: With start/stop times of 1300/2000 UT: 24*24h+11*7h=653h
|Schedule last updated: Monday, 5 October 2009
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
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:
The World Day Schedule for 2009 can be found at
- 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.
Procedures for requesting World Day experiments
Instructions and guidlines for submitting World Day proposals are available at:
A sample proposal for requesting special World Days will be available at:
Notes on World Day observations proposed for 2010
Dynamics and Temperature of the Lower
Thermosphere During 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.
- To measure neutral wind (zonal and meridional components) and electron and
ion temperatures in the lower thermosphere before and during sudden stratospheric
- 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.
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 2010 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,
Irfan Azeem, and
Coordinated Study of Quasi-Periodic Medium-Scale Traveling Ionospheric Disturbances
with Extended Latitude Coverage
Background Conditions: Low to moderate geomagnetic activity, New Moon.
- 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.
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.
Latitudinal and Altitudinal Variability of the Topside Ionosphere at Low, Mid, and High Latitudes
Background Conditions:Measurements during different seasons are requested (summer, equinox, winter).
Magnetic and solar activity is not of major concern.
- to investigate the latitudinal variability of topside parameters (temperatures, drifts, and composition) under
similar geophysical conditions
- to apply new measurement and analysis schemes to topside measurements
- to investigate topside ion upflow at high latitudes at different geomagnetic locations
- to investigate equatorial / low-latitude topside coupling via simultaneous measurements along common
(similar) flux tubes
ISRs Needed:All (especially PFISR, JRO and AO) including EISCAT ESR, VHF, and UHF (in that order of
preference), and Irkutsk
Parameters to Measure:Because these topside measurements require the extraction of “specialized”
products, such as H+/He+ fractions, and the data will be used to test the capability of extracting other products (such
as O+ and H+ velocities simultaneously), lag profiles / power spectra / raw data are requested (especially for PFISR
and AO). Measurement schemes will be developed with coordination at each institution, but in general, a common
approach will be requested, which will utilize long, uncoded pulses and application of analysis schemes developed
for these measurements. At AO, a dual-beam (vertical + beam-swinging) experiment is requested. At JRO, the offperpendicular
Hybrid2/Full-profile topside mode is requested. At MH, Sondrestrom, and EISCAT, field-aligned
direction is requested. At PFISR, 4-beam experiment is requested (field-aligned, bore-sight, and two-beams for
Secondary Parameters to Measure:Electric fields at all facilities
Simultaneous Data:The goal is to have similar geophysical conditions at all radars to investigate
latitudinal coupling of the topside region on closed field lines, and to investigate ion upflow under similar
geophysical conditions in the high latitude region. Ideally we would have measurements spread throughout the year
(at least three 24-hour periods), in summer, equinox, and winter.
Existing Data Meeting Objectives:Little coordinated topside data exists in the necessary form (lag profiles / raw
samples) in new modes (e.g., at JRO, PFISR) developed for topside measurements.
Existing Data Closest to Objectives:Data from uncoordinated days exists for each radar independently.
Relevance of Baseline WD Schedule:To our knowledge, there are no days set aside for coordinated topside
Participant Duties:Fabiano Rodrigues and Michael Nicolls will coordinate the experiments to ensure proper
modes are used at each UAF. The PIs will work closely with experts at each facility to analyze and interpret
Facility Personnel Contacted:Sixto Gonzalez (AO), David Hysell and Jorge Chau (JRO), Phil Erickson (MH),
Craig Heinselman (PFISR, Sondrestrom), Y. Ogawa (Nagoya University), Unni Pia Lovhaug (University of
Tromso), Tony van Eyken (SRI Internationa, EISCAT)
Solar Minimum:To cover the end of the unique extreme solar minumum
Background Conditions:Regular monthly experiments to cover the
The present solar minimum is the lowest in historic times and
the turning into higher solar activities should be coveraged.
- To provide an unprecedented data set with multiple applications.
- To provide correlative data for other instrumentation and models.
ISRs Needed: All, for at least 24-hour runs.
Parameters to Measure:Vertical power profiles through the E/F regions
The radar modes should cover altitude profiles of the normal IS
parameters over E and F regions, possibly also vector drifts.
Contact: Tony van Eyken,
Monday, 5 October 2009 by
Chairman of the URSI Incoherent Scatter Working Group.