The effects of solar activity: Electrons in the terrestrial lower ionosphere

Solar flare X-ray energy can cause strong enhancements of the electron density in the Earth’s atmosphere. This intense solar radiation and activity can cause sudden ionospheric disturbances (SIDs) and further create ground telecommunication interferences, blackouts as well as some natural disasters and caused considerable material damage. The focus of this contribution is on the study of these changes induced by solar X-ray flares using narrowband Very Low Frequency (VLF, 3–30 kHz) and Low Frequency (LF, 30–300 kHz) radio signal analysis. The model computation and simulation were applied to acquire the electron density enhancement induced by intense solar radiation. The obtained results confirmed the successful use of applied technique for detecting space weather phenomena such as solar explosive events as well for describing and modeling the ionospheric electron density which are important as the part of electric terrestrial-conductor environment through which external-solar wind (SW) electrons can pass and cause natural disasters on the ground like fires.

[1]  L. Ilic,et al.  Changes of atmospheric properties over Belgrade, observed using remote sensing and in situ methods during the partial solar eclipse of 20 March 2015 , 2017, Journal of Atmospheric and Solar-Terrestrial Physics.

[2]  M. Dimitrijević,et al.  Radiative and Collisional Molecular Data and Virtual Laboratory Astrophysics , 2017 .

[3]  M. Radovanović,et al.  Electrons or protons: what is the cause of forest fires in western europe on june 18, 2017? , 2017 .

[4]  N. Mason,et al.  BEAMDB and MolD – databases for atomic and molecular collisional and radiative processes: Belgrade nodes of VAMDC , 2017 .

[5]  L. Popović,et al.  Diagnostics of plasma in the ionospheric D-region: detection and study of different ionospheric disturbance types , 2017, 1705.07648.

[6]  A. Nina,et al.  IONOSPHERIC D-REGION TEMPERATURE RELAXATION AND ITS INFLUENCES ON RADIO SIGNAL PROPAGATION AFTER SOLAR X-FLARES OCCURRENCE , 2017, 1705.07657.

[7]  Milan Milenkovic,et al.  FOREST FIRES IN PORTUGAL — THE CONNECTION WITH THE ATLANTIC MULTIDECADAL OSCILLATION (AMO) , 2017 .

[8]  L. Popovi'c,et al.  Behaviour of electron content in the ionospheric d-region during solar x-ray flares , 2016, 1705.07676.

[9]  A. Mihajlov,et al.  A study of VLF signals variations associated with the changes of ionization level in the D-region in consequence of solar conditions , 2016, 1603.07300.

[10]  L. Popović,et al.  Detection of short‐term response of the low ionosphere on gamma ray bursts , 2015, 1801.10153.

[11]  A. Hertzog,et al.  First quasi-Lagrangian in situ measurements of Antarctic Polar springtime ozone: observed ozone loss rates from the Concordiasi long-duration balloon campaign , 2014 .

[12]  V. Srećković,et al.  A comparative study of measured amplitude and phase perturbations of VLF and LF radio signals induced by solar flares , 2014, 1404.1019.

[13]  M. Dimitrijević,et al.  The ion–atom absorption processes as one of the factors of the influence on the sunspot opacity , 2014, 1404.0688.

[14]  A. Nina,et al.  Electron production by solar Ly-α line radiation in the ionospheric D-region , 2014, 1403.1443.

[15]  M. Dimitrijević,et al.  Ion-atom radiative processes in the solar atmosphere: quiet Sun and sunspots , 2013, 1312.0094.

[16]  M. Dimitrijević,et al.  The non-symmetric ion-atom radiative processes in the stellar atmospheres , 2013, 1302.5912.

[17]  V. Srećković,et al.  Altitude distribution of electron concentration in ionospheric D-region in presence of time-varying solar radiation flux , 2012, 1204.4306.

[18]  V. Srećković,et al.  Effective electron recombination coefficient in ionospheric D-region during the relaxation regime after solar flare from February 18, 2011 , 2012, 1204.4309.

[19]  V. Srećković,et al.  The Influence of Solar Spectral Lines on Electron Concentration in Terrestrial Ionosphere , 2012, 1201.2282.

[20]  M. Dimitrijević,et al.  CHEMI-IONIZATION IN SOLAR PHOTOSPHERE: INFLUENCE ON THE HYDROGEN ATOM EXCITED STATES POPULATION , 2011, 1105.2134.

[21]  G. Kopp,et al.  A new, lower value of total solar irradiance: Evidence and climate significance , 2011 .

[22]  A. Emslie,et al.  The Physics of Solar Flares , 2009 .

[23]  João Gomes,et al.  Solar Activity and Forest Fires , 2009 .

[24]  K. Georgieva,et al.  The role of the sun in climate change , 2009 .

[25]  M. Radovanović,et al.  Solar activity as a possible cause of large forest fires--a case study: analysis of the Portuguese forest fires. , 2008, The Science of the total environment.

[26]  J. Haigh.  The Sun and the Earth’s Climate , 2007 .

[27]  F. Joos,et al.  Solar influence on climate during the past millennium: Results from transient simulations with the NCAR Climate System Model , 2007, Proceedings of the National Academy of Sciences.

[28]  G. W. Prölss,et al.  Physics of the Earth’s Space Environment: An Introduction , 2004 .

[29]  D. Rind,et al.  The Sun's Role in Climate Variations , 2002, Science.

[30]  J. A. Ferguson,et al.  Computer Programs for Assessment of Long-Wavelength Radio Communications, Version 2.0: User's Guide and Source Files , 1998 .

[31]  Howard A. Garcia,et al.  Temperature and emission measure from goes soft X-ray measurements , 1994 .

[32]  T. Moore,et al.  The Earth's Ionosphere. Plasma Physics and Electrodynamics. Michael C. Kelley, with contributions from Rodney A. Heelis. Academic Press, San Diego, CA, 1989. xii, 487 pp., illus. $89.95. International Geophysics Series, vol. 43. , 1990, Science.

[33]  Donald T. Farley,et al.  Radar interferometry: A new technique for studying plasma turbulence in the ionosphere , 1981 .

[34]  D. Walker.  Phase steps and amplitude fading of VLF signals at dawn and dusk , 1965 .

[35]  M. Milovanović,et al.  The connection between solar wind charged particles and tornadoes: Case analysis , 2013 .

[36]  M. Radovanović.  Forest fires in Europe from July 22-25, 2009 , 2010 .

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

[38]  K. Folkestad.  Ionospheric Radio Communications , 1968 .

[39]  Kenneth Davies,et al.  Ionospheric Radio Propagation , 1965 .

[40]  James R. Wait,et al.  Characteristics of the earth-ionosphere waveguide for VLF radio waves , 1964 .

[41]  K. Budden,et al.  Radio waves in the ionosphere : the mathematical theory of the reflection of radio waves from stratified ionised layers , 1961 .

[42]  Karl Rawer,et al.  Wave propagation in the ionosphere , 1957 .