The response of the ionosphere to faint and bright solar flares as deduced from global GPS network data

Results derived from analysing the ionosphere response to faint and bright solar flares are presented. The analysis used technology of a global detection of ionospheric effects from solar flares as developed by the authors, on the basis of phase measurements of the Total Electron Content (TEC) in the ionosphere using an international GPS network. The essence of the method is that use is made of appropriate filtering and a coherent processing of variations in the TEC which is determined from GPS data, simultaneously for the entire set of visible GPS satellites at all stations used in the analysis. This technique is useful for identifying the ionospheric response to faint solar flares (of X-ray class C) when the variation amplitude of the TEC response to separate line-on-sight to GPS satellite is comparable to the level of background fluctuations. The dependence of the TEC variation response amplitude on the bright flares location on the Sun is investigated.

[1]  L. S. Wagner,et al.  Electron density enhancements in the E and F regions of the ionosphere during solar flares , 1971 .

[2]  J. Mosher.  The height structure of solar active regions at X-ray wavelengths as deduced from OSO-8 limb crossing observations , 1979 .

[3]  E. L. Afraimovich,et al.  GPS global detection of the ionospheric response to solar flares , 2000, physics/0007026.

[4]  K. Davies,et al.  Recent progress in satellite radio beacon studies with particular emphasis on the ATS-6 radio beacon experiment , 1980 .

[5]  Ionospheric effects of the solar flares of September 23, 1998 and July 29, 1999 as deduced from global GPS network data , 2000, physics/0007036.

[6]  T. Jones.  VLF phase anomalies due to a solar X-ray flare , 1971 .

[7]  R. F. Donnelly.  Empirical models of solar flare X ray and EUV emission for use in studying their E and F region effects , 1976 .

[8]  A. Mitra,et al.  Ionospheric effects of solar flares , 1974 .

[9]  J. Klobuchar.  Ionospheric Time-Delay Algorithm for Single-Frequency GPS Users , 1987, IEEE Transactions on Aerospace and Electronic Systems.

[10]  L. Kersley,et al.  Behavior of the ionospheric F region during the Great Solar Flare of August 7, 1972 , 1974 .

[11]  J. Bernard Minster,et al.  GPS detection of ionospheric perturbations following a space shuttle ascent , 1996 .

[12]  M. Ohshio.  Negative Sudden Phase Anomaly , 1971 .

[13]  S. Tanahashi,et al.  SUDDEN ENHANCEMENTS (SEA) AND DECREASES (SDA) OF ATMOSPHERICS. , 1970 .

[14]  Carolus J. Schrijver,et al.  Coronal Loop Oscillations Observed with the Transition Region and Coronal Explorer , 1999 .

[15]  Werner Gurtner,et al.  RINEX : The Receiver · ! Independent Exchange Format 1 , 2022 .

[16]  D. Samain.  Solar continuum data on absolute intensities, center to limb variations and Laplace inversion between 1400 and 2100 A , 1979 .

[17]  B. Hofmann-Wellenhof,et al.  Global Positioning System , 1992 .

[18]  J. Klobuchar.  Real‐time ionospheric science: The new reality , 1997 .

[19]  L. A. Leonovich,et al.  The use of the international GPS network as the global detector (GLOBDET) simultaneously observing sudden ionospheric disturbances , 2000 .

[20]  M. Mendillo,et al.  Incoherent scatter observations of the ionospheric response to a large solar flare , 1974 .

[21]  R. F. Donnelly.  Contribution of X‐ray and EUV bursts of solar flares to sudden frequency deviations , 1969 .

[22]  Chi‐Yen Lin,et al.  The solar flare radiation responsible for sudden frequency deviation and geomagnetic fluctuation , 1996 .

[23]  D. Heath,et al.  Temporal variations of solar EUV, UV, and 10,830-A radiations , 1986 .

[24]  R. F. Donnelly.  Extreme ultraviolet flashes of solar flares observed via sudden frequency deviations: Experimental results , 1970 .

[25]  S. D. Deshpande,et al.  Ionospheric effects of solar flares—IV. Electron density profiles deduced from measurements of SCNA's and VLF phase and amplitude , 1972 .

[26]  A. C. Riddle,et al.  The quiet and slowly varying components of 9.1 cm radio emission during the solar minimum , 1969 .

[27]  L. Puga,et al.  Thirteen-day periodicity and the center-to-limb dependence of UV, EUV, and X-ray emission of solar activity , 1990 .