dorsal/arxiv
View SchemaIonospheric effects of the solar flares of September 23, 1998 and July 29, 1999 as deduced from global GPS network data
| Authors | E. L. Afraimovich, A. T. Altyntsev, E. A. Kosogorov, N. S. Larina, L. A. Leonovich |
|---|---|
| Categories | |
| ArXiv ID | physics/0007036 |
| URL | https://arxiv.org/abs/physics/0007036 |
| DOI | 10.1016/S1364-6826(01)00060-8 |
Abstract
This paper presents data from first GPS measurements of global response of the ionosphere to solar flares of September 23, 1998 and July 29, 1999. The analysis used novel technology of a global detection of ionospheric effects from solar flares (GLOBDET) as developed by one of the authors (Afraimovich E. L.). The essence of the method is that use is made of appropriate filtering and a coherent processing of variations in total electron content (TEC) in the ionosphere which is determined from GPS data, simultaneously for the entire set of visible (over a given time interval) GPS satellites at all stations used in the analysis. It was found that fluctuations of TEC, obtained by removing the linear trend of TEC with a time window of about 5 min, are coherent for all stations and beams to the GPS satellites on the dayside of the Earth. The time profile of TEC responses is similar to the time behavior of hard X-ray emission variations during flares in the energy range 25-35 keV if the relaxation time of electron density disturbances in the ionosphere of order 50-100 s is introduced. No such effect on the nightside of the Earth has been detected yet.
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"abstract": "This paper presents data from first GPS measurements of global response of\nthe ionosphere to solar flares of September 23, 1998 and July 29, 1999. The\nanalysis used novel technology of a global detection of ionospheric effects\nfrom solar flares (GLOBDET) as developed by one of the authors (Afraimovich E.\nL.). The essence of the method is that use is made of appropriate filtering and\na coherent processing of variations in total electron content (TEC) in the\nionosphere which is determined from GPS data, simultaneously for the entire set\nof visible (over a given time interval) GPS satellites at all stations used in\nthe analysis. It was found that fluctuations of TEC, obtained by removing the\nlinear trend of TEC with a time window of about 5 min, are coherent for all\nstations and beams to the GPS satellites on the dayside of the Earth. The time\nprofile of TEC responses is similar to the time behavior of hard X-ray emission\nvariations during flares in the energy range 25-35 keV if the relaxation time\nof electron density disturbances in the ionosphere of order 50-100 s is\nintroduced. No such effect on the nightside of the Earth has been detected yet.",
"arxiv_id": "physics/0007036",
"authors": [
"E. L. Afraimovich",
"A. T. Altyntsev",
"E. A. Kosogorov",
"N. S. Larina",
"L. A. Leonovich"
],
"categories": [
"physics.geo-ph"
],
"doi": "10.1016/S1364-6826(01)00060-8",
"title": "Ionospheric effects of the solar flares of September 23, 1998 and July 29, 1999 as deduced from global GPS network data",
"url": "https://arxiv.org/abs/physics/0007036"
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