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TABLE OF CONTENTS:\
The IRI file ig_rz.dat has been updated with the newest available indices and predictions and is now available at ftp://nssdcftp.gsfc.nasa.gov/models/ionospheric/iri/iri2001/fortran_code/ig_rz.dat. The 12-month-running mean of sunspot number (R12) was obtained from the National Geophysical Data Center (NGDC) in Boulder, Colorado. R12 predictions from December 2001 to December 2005 were obtained from the Ionospheric Prediction Service (IPS) in Sydney, Australia. The 12-month-running mean of the ionospheric IG index (IG12) and IG12 predictions were obtained from the World Data Center C1 (WDC-C1) in Chilton, U.K. The IRI team greatly acknowledges the efforts at NGDC, IPS, and WDC-C1 in maintaining and updating the database of these indices. Compared to the previous ig_rz.dat file (June 2002) the R12 predictions increased (July 2002: 90 to 103) whereas the IG12 predictions decreased (July 2002: 145 to 135).
URSI/COSPAR INTERNATIONAL REFERENCE IONOSPHERE WORKSHOP
Rhodes University, Grahamstown, South Africa, October 6-10, 2003\
The URSI/COSPAR Working Group on the International Reference Ionosphere (IRI) will hold its next annual meeting at Rhodes University, Grahamstown, South Africa, from October 6 to 10, 2003. IRI is the reference standard for ionospheric parameters recommended for international use by the Committee on Space Research (COSPAR) and by the International Union of Radio Science (URSI). The annual meetings are the primary venue for improvements and refinements of the IRI representation of ionospheric electron density, electron temperature, ion composition, ion temperatures and electron and ion drift. The special emphasis of the 2003 Workshop will be on quantifying ionospheric variability. All papers related to IRI are welcome, particularly papers that point out shortcomings of the model, papers that introduce improvements or new parameters, and papers that report on applications of the IRI model. It is expected that selected papers from this meeting will be published in Advances in Space Research. Organizing Committee: L. McKinnell (South Africa), A. Poole (South Africa), D. Bilitza (USA) Programme Committee: B. Reinisch (USA), D. Bilitza (USA), L. McKinnell (South Africa), K. Oyama (Japan), K. Rawer (Germany), P. Dyson (Australia), S. Radicella (Italy/Argentina), P. Bradley (U.K.), S. Pulinets (Russia) Abstracts are due by APRIL 15, 2003. Please include title, author(s), address with Fax and e-mail and send by e-mail to L.McKinnell@ru.ac.za. The length of the whole abstract should not be more than one page. The homepage for the IRI 2003 workshop is at http://phlinux.ru.ac.za/hoia/IRI2003/. More information about the IRI project and past IRI workshops can be found at http://nssdc.gsfc.nasa.gov/space/model/ionos/iri.html The homepage of the Hermann Ohlthaver Institute for Aeronomy (HOIA), the host institute, is at http://phlinux.ru.ac.za/hoia/
The IRIWeb interface at http://nssdc.gsfc.nasa.gov/space/models/iri.html was upgraded to the latest version of the IRI model. IRIWeb lets user compute, list, and plot IRI parameters. In additional to the traditional IRI parameters (Ne, Te, Ti, Ni, TEC) users can now also compute the equatorial vertical ion drift, the ratio foF2_storm/foF2_quiet, and the F1 occurrence probability using three different models. Several new input options are provided: (i) the user can specify the sunspot number (R) and the ionospheric index (IG), (ii) the STROM model can be turned on and off, (iii) for the topside electron temperature the new Triskov-Truhlik-Smilauer model can be used, (iv) for the D-region electron density the new Friedrich-Torkar model can be used, (v) for the F1 occurrence probability the user can choose between three model options.
Several corrections and improvements were made to the IRI-2000 code and the newest version of the IRI files is now available at ftp://nssdcftp.gsfc.nasa.gov/models/ionospheric/iri/iri2001/fortran_code/ Thank you to all users who pointed out specific problems and often helped resolving them: David Simpson, GSFC, Code 692/582; Cemil B Erol, Turkey; Daniel Heynderickx, BIRA, Brussel, Belgium; Richard E. Denton, Dartmouth College, Hanover, New Hampshire; Kevin Jennings, SwRI, Texas; Bill Taylor, Raytheon ITSS, Lanham, Maryland; Minakishi Chamua, Dibrugarh University, Assam, India. Specific corrections are listed with dates and short explanations in the comment field at the top of the Fortran program files, e.g.: (i) the reading of the Ap indices was sped up using keyed access; (ii) TABs were substituted by blanks and a 72 character per line limit was enforced to conform with older compilers; (iii) an error in the computation of electron and ion temperatures with the new TTS electron temperature option was corrected; a December-31 problem of the the new D-95 ion composition model was corrected; (iv) users can now specify the ionospheric IG index as well as the sunspot number index; etc.
The IRI homepage is at here
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