IRI'99 Workshop


Center for Atmospheric Research
University of Massachusetts Lowell

August 9-12, 1999

The URSI/COSPAR Working Group on the International Reference Ionosphere (IRI) will hold its next annual meeting at the University of Massachusetts Lowell, USA, from August 9 to 12, 1999, i.e. in the week preceding the URSI General Assembly in Toronto, Canada. These annual meetings are the primary venue for improvements and refinements of the IRI representation of ionospheric electron density, electron temperature, ion composition and ion temperatures.

The special emphasis of the 1999 Workshop will be on (1) specification of the variability of ionospheric characteristics, and (2) the use of IRI for ray tracing studies and applications.

Other topics of interest for the workshop include comparisons of IRI with measurements and with other models, suggested improvements and additions for IRI, and applications of the IRI model. Papers on new additions to IRI are especially welcome: strom-time model, ion drift model, spread-F model, and plasmaspheric model. It is expected that selected papers from this meeting will be published in Advances in Space Research.

Organizing Committee: B. Reinisch (UML), X. Huang (UML), D. Bilitza (Raytheon ITSS)

Programme Committee: B. Reinisch, D. Bilitza, K. Oyama (ISAS, Japan), K. Rawer (Germany), P. Dyson (Australia), S. Radicella (Italy/Argentina), P. Bradley (U.K.), S. Pulinets (Russia)



The cost for the IRI-99 Workshop is ($US) $125.00 per person to cover the workshop costs. Fortunately, the workshop organizers have applied to the National Science Foundation for grant money to cover this cost for all participants. Final approval of this grant fund is favorable with a final determination sometime in May/June 1999. All registered participants will be notified once notification has been received from NSF.

Registration Form

Registration can be done electronically or by facsimile. To register electronically, send the following information to

Telephone Number:
Facsimile Number:
Email Address (if different from the account you are using to register electronically):
Preferred lodging (hotel/dormitory):
Do you want UMass Lowell to make lodging reservations (Y/N):
If yes for hotel:

If yes for dormitory: To register by facsimile, fax the above information to (978) 459-7915.

Registration Deadline

The registration deadline is 15 July 1999.


9 August 1999, Monday

0830 – 0930 Registration and Opening Remarks

1A Ray Tracing Session

Chair: A. Poole
1A-1 0930 – 1000 Ray Tracing Tools for Studies of Ionospheric Propagation, P. Dyson, J. Bennett
1000 – 1030 Coffee break
1A-2 1030 – 1100 Optimizing Multi Quasi-Parabolic Fitting to IRI Profiles, X. Huang and B. Reinisch
1A-3 1100 – 1130 Fitting Functions to the IRI for Ray Tracing, J. Bennett, P. Dyson

1B D Region Session

Chair: P. Wilkinson
1B-1 1130 – 1200 Empirical D-Region Modelling and Winter Variability of Electron Density, W. Singer
1B-2 1200 – 1220 A Novel Concept for Empirical D-Region Modeling, M. Friedrich and R. Pilgrim, and K. Torkar
1230 – 1400 Lunch

1C Measurements and Comparisons

Chair: W. Singer
1C-1 1400 – 1430 Status of the European COST 251 Project and Relevance to IRI, R. Hanbaba, and B. Zolesi
1C-2 1430 – 1500 Empirical Models of Parameters B0, B1 from Arecibo Radar Measurements, K. Mahajan and N. Sethi
1C-3 1500 – 1520 Electron Density and Height at the Intermediate Region for Low Latitude Stations: Observations and Models, M. Mosert, S. Radicella, J. Adeniyi, R. Ezquer, C. Jadur
1520 – 1550 Coffee break
1C-4 1550 – 1610 Digisonde Measurements from Casey Base, Antarctica, A. Breed, P. Dyson, R. Morris
1C-5 1610 – 1630 Measured and Predicted Electron Density at 600 km of Altitude in the Low Latitude Region, R. Ezquer, M. Cabreera, S. Radicella, and J. Manzano
1C-6 1630 – 1650 Model for Evaluating Day to Day Disturbance at F2 Peak, S. Shastri
1C-7 1650 – 1710 Comparison of the Data from the Irkutsk Incoherent Scatter Radar with International Ionospheric Model IRI-95, O. Verngardt, V. Kurkin and A.Potekhin

10 August 1999, Tuesday

2A Temperature and Ion Composition

Chair: S. Pulinets
2A-1 0830 – 0900 Improved Electron Temperature Model and Comparison with Satellite Data V. Truhlik, L. Triskova, and J. Smilauer
2A-2 0900 - 0930 Electron Temperature Profile up to the Height of 8000 km- the Solar Activity, Latitude and Local Time Dependence, K. Oyama, T. Abel, T. Yamamoto, T. Imagawa, Y. Su, and G. Bailey

2B Topside, Plasmasphere, TEC

Chair: K. Oyama
2B-1 0930 – 1000 Empirical Modeling of the Plasmasphere, D. Gallagher, P. Craven and R. Comfort
1000 - 1030 Coffee break
2B-2 1030 - 1100 Modelling Topside Density Profiles for IRI, D. Bilitza, F. Varosi, and R. Williamson
2B-3 1100 - 1120 Simulation of Sub-Total Electron Content with IRI and SMI Models Using Interkosmos-19 Topside Electron Density Profiles, T. Gulyaeva, P. Kishcha, Y. Chasovitin and S. Ivanova
2B-4 1120 – 1150 Real Time Vertical TEC Measurements with Groundbased Ionosondes, B. Reinisch, X. Huang
2B-5 1150 – 1210 The Use of Topside Ionograms Alone to Model Bottom and Topside Electron Density and TEC, B. Nava, S. Radicella, S. Pulinets, and V. Depuev
1210 – 1400 Lunch

2C Total Electron Content

Chair: S. Radicella
2C-1 1400 – 1430 Predicted and Measured Slant TEC for the ATS 6 Satellite – Boulder Radio Signal Path IRI Slant TEC Predictions over Rome, R. Ezquer, C. Jadur, S. Radicella, and J. Manzano
2C-2 1430 – 1450 GPS Observations of Total Electron Content in Southern Australia and Comparisons with IRI and PIM Predictions, A. Breed and G. Goodwin
2C-3 1450 – 1510 Comparative Study of TEC with IRI Model for Solar Minimum Period at Low Latitude, N. Sethi, V. Pandey and K. Mahajan
2C-4 1510 – 1530 Variability of Equivalent Slab Thickness and its Comparison with IRI, V. Pandey, N. Sethi and K. Mahajan
1530 – 1600 Coffee break
2C-5 1600 – 1630 IRI Data Ingestion and Ionospheric Tomography, G. Bust, C. Coker, D. Coco, and T. Gaussiran
2C-6 1630 – 1650 Total Electron Content Measurements in Argentina Using NNSS Satellites, V. Rios
2C-7 1650 – 1710 Flexible Prior Models Three-Dimensional Ionospheric Tomography, R. Cornely

11 August 1999, Wednesday

3A Improvements and New Inputs

Chair: B. Reinisch
3A-1 0830 – 0900 An Empirical Ionospheric Storm-Time Correction Model, T. Fuller-Rowell, E. Araujo-Pradere, and M. Codrescu
3A-2 0900 - 0920 Variability and Magnetic Storm Effects in Equatorial Electron Density Profile, S. Radicella, J. Adeniyin 
3A-3 0920 – 0950 Investigation of Nighttime Electron Density Enhancements duing January 6-12, 1997,
P. Richards, M. Buonsanto, B. Reinisch
0950 - 1020 Coffee Break
3A-4 1020 – 1040 Empirical Model of the Upper Transition Height for Low and Middle Latitudes, L. Triskova, V. Truhlik and J. Smilauer
3A-5 1040 – 1100 Dynamic Boundaries of the Ionosphere Variability, T. Gulyaeva and K.Mahajan
3A-6 1100 – 1120 Secular Decrease of the F2 Peak Altitude at Northern Temperature Latitudes, R. Eyfrig
and K. Rawer
3A-7 1120 – 1140 A Neural Network Approach to Profile Measurements in South Africa, L. McKinnell, and A. Poole
3A-8 1140 - 1200 Neural Networks and the IRI: South Africa Work, A. Poole and L. McKinnell
3A-9 1200 – 1220 Ionospheric Variability Induced by Seismic Activity, S. Pulinets, V. Depuev, and T. Gaivoronskaya
1220 Lunch
1515 Meet Bus outside at Center for Atmospheric Research for Tanglewood Concert

12 August 1999, Thursday

4A Drift Data and Modeling

Chair: P. Bradley
4A-1 0830 - 0900 Equatorial, Low- and Mid-Latitude Radar and Satellite F-Region Plasma Drift Models,
L. Scherliess and B. Fejer
4A-2 0900 – 0930 MU Radar Measurements of Ion Drifts During 1986-1996, S. Zhang, Y. Otsuka and
S. Fukao

4B Evaluation of IRI and Other Models

Chair: D. Bilitza
4B-1 0930 – 0950 Comprehensive Evaluation of Ionospheric Models, D. Decker, , W. Borer, P. Doherty, P. Sultan, J. Wise, T. Bullett, G. Bishop, and R. Daniell Jr.
0950 - 1020
4B-2 1020 - 1050 Comparing Low and Mid-Latitude Ion Densities Measured by DMSP with Densities from Calculated by the IRI and PIM Models, F. Rich and P. Sultan
4B-3 1050 – 1150 Comparison Between an Empirical Ionospheric Model Based on Millstone Hill Incoherent Scatter Radar Data and IRI-95: Initial Results, M. Buonsanto, J. Holt, and C. Rudin
4B-4 1150 – 1220 The Evolution of the DGR Approach to Model Electron Density Profiles, S. Radicella and R. Leitinger
1220 – 1400 Lunch

4C Applications

Chair: P. Dyson
4C-1 1400 – 1430 IRI and Radio Service Planning, P. Bradley
4C-2 1430 – 1450 IRI Applications at IPS, P. Wilkinson, J. Wu, Y. Wang and D. Monselesan
4C-3 1450 – 1510 Ionospheric Models and the Environmental Scenario Generator, R. Conkright and E. Kihn
4C-4 1510 – 1530 Evaluation of IRI-95 to Correct Errors Caused by Faraday Rotation in Passive Microwave Remote Sensing from Space, S. Abraham and D. LeVine
1530 – 1600 Coffee break
4C-5 1600 – 1620 Creating IRI Model in WINDOWS, X. Huang and B. Reinisch
4C-6 1620 – 1640 Using IRI-95 in FMCW Signal Simulation, A. Potekhin

4D Final Discussion

Chair: D. Bilitza
1640 - 1800 Final Discussion



Airport Transportation

For transportation from Logan Airport (Boston) to Lowell, we recommend two services. Both services are clearly marked on the outside of each bus/van:

One service is M&L Bus Line. To schedule a pick-up with this service, on arrival in Logan, use a pay phone and call 1-781-938-8646. The cost of the call will be $0.25. Advise the M&L operator what airline you arrived and that you want to go to the DoubleTree Hotel in Lowell. They will advise you when the next shuttle arrives and where to meet the shuttle. The cost, cash or travelers checks, is $22 for one or $34 for two people plus gratuity (typically 10 - 15% based on quality of service). This bus/van will bring you directly to the DoubleTree Hotel in Lowell. To get from the hotel to the dormitory, you will need to take a taxicab to Donahue Hall (North campus) at the University of Massachusetts Lowell. This ride is approximately 5 km. The front desk at the hotel can assist you in getting a taxi.

Another service is Flightline, however this service requests a twenty-four hour advance notice, specifically if you are arriving in Boston after 11:00P.M. We will assist you in making a reservation should you decide to use this service. Once a reservation has been made and you arrive in Logan, to schedule a pick-up, use a pay telephone and dial 1-800-245-2525 (this is a free call). Again advise the operator with which you arrived and that you want to go to the DoubleTree Hotel in Lowell. They will advise you where and when to catch the next shuttle. The cost, cash or traveler check, is $29 for one person, $45 for two people plus gratuity. As above, this bus/van will take you directly to the DoubleTree Hotel. Again to get from the hotel to the dormitory, you will need to take a taxicab to Donahue Hall (North campus) at the University of Massachusetts Lowell.

Local Lodging

Two local lodging arrangements are available to the IRI participants. The first is the local DoubleTree Hotel Lowell, located in downtown Lowell approximately 3 km from our facility. The charge per night is $97.63 (this includes all taxes) and you can charge your room on a credit card. The telephone number is (978) 452-1200 (or 800 876-4586 in the Continental U.S.), facsimile (978) 453-4674. If you elect to make your own room reservations, please advise the reservations clerk that you are part of the University of Massachusetts Lowell Center for Atmospheric Research IRI Workshop, as we have reserved a block of rooms for participants. This block of rooms is only reserved through 16 July 1999, so reservations must be made before this date to ensure room availability. If you advise us of the date and approximate time you will be arriving in Lowell, we will make your room reservations for you. If we are making the reservations, please let us know if you will have a traveling companion (the room rate is the same for two people per room) and if you desire a smoking or non-smoking room. If we make the reservation for you, we will need a credit card number to confirm the reservation. You will not need a rental car as we have made arrangements with the hotel for daily shuttle service to/from the University for each day of the workshop. The hotel has one restaurant, room service and one lounge operating on the premises.

The second lodging option is the University dormitory. We have made arrangements with one of the dormitories for lodging. The rate for the lodging is $100 per week (workweek) per person. Additional costs may apply if you stay in the dormitory over the weekend. Housing will be guaranteed through 1 July 1999, then will only be available on a first-come-first-serve basis. Payment can only be done with cash or travelers checks. Each room is equipped with a phone offering free local calls and a voice mailbox. An initial linen package will be included at no additional cost. Washers and dryers are available in the building. There is cafeteria service operating across the street offering three meals a day. Meals are not included in the room rate, however, are very affordable. The dormitory is very close to the Conference Center, approximately 0.25km.

In order to check-in to the dormitory, you will need to obtain your key and key pad code from the Wannalancit Security Office located at 660 Suffolk St., Lowell, MA. Please make sure the taxi takes you to this location first. This office is located approximately ½ a mile from the dormitory. Along with your key you will receive a map with directions to the Donahue Dormitory. You will need to provide the Security Office with identification in order to receive your key. Also, they will not allow you to pick up someone else’s key on their behalf. The Security Office is open 24 hours a day so there will be someone there no matter what time you arrive. Please be aware that I will be collecting the money for your accommodations the following day you arrive. Upon departure you should leave the key in your room, preferably in the envelope.This year we will have access to one of the newer dormitories at the University for the lodging, however, the dormitory is not air-conditioned. Fans are available, as long as their supply of fans lasts.

Conference Facilities

The conference facility for the IRI Workshop will be the MIL Conference Center located in the Wannalancit Mill Complex at 600 Suffolk Street (the same building as the Center for Atmospheric Research). The MIL Conference Center is approximately 5000 ft2 equipped with state-of-the-art presentation equipment. A summary of equipment available includes:

In July, the University of Massachusetts Lowell Center for Atmospheric Research (UMLCAR) will establish an anonymous ftp account on the UMLCAR server to allow IRI participants to transfer their presentation materials electronically to a local computer. UMLCAR personnel will ensure that these files are available on the Conference Center computer prior to the start of the workshop.

Local Attractions

Local attractions in the Lowell area can be viewed at Lowell is approximately 50 km North of the City of Boston. Transportation to Boston is available through a commuter rail service from Lowell (Lowell Commuter Rail Line) to Boston’s North Station in the heart of the city. Transportation in Boston is available through the MBTA subway system. Local attractions in Boston can be viewed at The commuter rail and subway fares, maps and schedules can be viewed at