Cosmic Ray Intensity Variation Cosmic Ray Intensity Variation and Its Connection with the Total and Its Connection with the Total

and Spectral Solar Irradianceand Spectral Solar Irradiance

Gigolashvili Marina, Gigolashvili Marina, Kapanadze NatelaKapanadze Natela

Georgian National Astrophysical Georgian National Astrophysical Observatory at Ilia Chavchavadze State Observatory at Ilia Chavchavadze State

University, Tbilisi, GeorgiaUniversity, Tbilisi, Georgia

AbstractAbstract• Variations of the Solar Spectral Irradiance (SSI) Variations of the Solar Spectral Irradiance (SSI)

and the Cosmic Ray variations using last space and the Cosmic Ray variations using last space observations during 2003-2008 by satellite observations during 2003-2008 by satellite precise devices and ground-based observations precise devices and ground-based observations of the Cosmic rays in Tbilisi, Oulu and Magadan of the Cosmic rays in Tbilisi, Oulu and Magadan with standard neutron monitors are investigated.with standard neutron monitors are investigated.

• By spectral analyses of the time series of the SSI By spectral analyses of the time series of the SSI (spectral ranges (spectral ranges λ λλ λ 1-7, 30.4, 121.5, 312.360, 1-7, 30.4, 121.5, 312.360, 405.990 nm) and the cosmic rays variations we 405.990 nm) and the cosmic rays variations we have found that the negative correlation exists have found that the negative correlation exists between the cosmic rays intensity and solar 0.1-between the cosmic rays intensity and solar 0.1-7, 30.4, 121.5, 312.4 nm X-ray flux. Only 405.99 7, 30.4, 121.5, 312.4 nm X-ray flux. Only 405.99 nm X-ray fluxes are positively correlated with the nm X-ray fluxes are positively correlated with the cosmic rays observed in Tbilisi, Oulu and cosmic rays observed in Tbilisi, Oulu and Magadan.Magadan.

InvestigationsInvestigations• The solar radiation fuels the chemical and dynamical The solar radiation fuels the chemical and dynamical

processes of the Earths atmosphere. Any variations in processes of the Earths atmosphere. Any variations in solar radiation will change the atmosphere's structure, solar radiation will change the atmosphere's structure, temperature, and composition. It is the reason that temperature, and composition. It is the reason that studies of the Earth require precise and accurate studies of the Earth require precise and accurate knowledge of both the intensity of solar radiation and knowledge of both the intensity of solar radiation and the amount by which it varies. The Sun's radiation the amount by which it varies. The Sun's radiation spans the color spectrum from very energetic x-rays, spans the color spectrum from very energetic x-rays, through the visible, and out to the infrared.through the visible, and out to the infrared.

• Statistical analysis on data of total and spectral solar Statistical analysis on data of total and spectral solar irradianceirradiancewas carried out during 2003-2008, using the data from was carried out during 2003-2008, using the data from the Solar Irradiance Datacenter's website LASP. the Solar Irradiance Datacenter's website LASP.

• Solar ultraviolet (UV) irradiance (115-420 nm, 1150-Solar ultraviolet (UV) irradiance (115-420 nm, 1150-4200 Å) originates mostly in the solar photosphere and 4200 Å) originates mostly in the solar photosphere and chromosphere.chromosphere.

• The solar EUV flux, particularly below 130 nm (1300 Å) The solar EUV flux, particularly below 130 nm (1300 Å) originates in the chromosphere, the chromosphere-originates in the chromosphere, the chromosphere-corona transition region, and the solar corona.corona transition region, and the solar corona.

ObjectsObjects

• Our aim is investigation of the TSI, SSI Our aim is investigation of the TSI, SSI and Cosmic Ray variations using last space and Cosmic Ray variations using last space observations by different precise devices observations by different precise devices during 2003-2008.during 2003-2008.

• By spectral analyzes of the time series of By spectral analyzes of the time series of the solar total and spectral irradiances the solar total and spectral irradiances show show large systematic differenceslarge systematic differences in in fitting coefficients for solar and space fitting coefficients for solar and space characteristics variation. The purpose of characteristics variation. The purpose of our study is to reveal some similar our study is to reveal some similar variations in TSI, SSI and in the Cosmic variations in TSI, SSI and in the Cosmic Ray’s intensity. Ray’s intensity.

Cosmic Ray’s Intensity for 2003-2008 by Oulu Cosmic Ray Station

(+65° 1', +25° 28')

Cosmic Ray’s Intensity for 2003-Cosmic Ray’s Intensity for 2003-2007 by Tbilisi Cosmic Ray Station 2007 by Tbilisi Cosmic Ray Station

(+(+41° 41', 41° 41', ++44° 444° 488''))

Cosmic Ray’s Intensity for 2003-2007 Cosmic Ray’s Intensity for 2003-2007 by Magadan Cosmic Ray Station by Magadan Cosmic Ray Station

(+(+59° 34', 59° 34', ++150° 48'150° 48'))

Variation of TSI at 1 AU for 25-Variation of TSI at 1 AU for 25-Feb-2003 to 8-Jul-2008Feb-2003 to 8-Jul-2008

SSI Data for Wavelength 30.4 SSI Data for Wavelength 30.4 nm nm

for 1-Aug-2003 to 5-Jul-2008for 1-Aug-2003 to 5-Jul-2008

SSI Data for Wavelength SSI Data for Wavelength 405.99 nm 405.99 nm

for 1-Aug-2003 to 5-Jul-2008for 1-Aug-2003 to 5-Jul-2008

SSI Data for Wavelength 121.5 SSI Data for Wavelength 121.5 nm nm

for 1-Aug-2003 to 5-Jul-2008for 1-Aug-2003 to 5-Jul-2008

SSI Data for Wavelength 0.1-7 SSI Data for Wavelength 0.1-7 nm nm

for 1-Aug-2003 to 5-Jul-2008for 1-Aug-2003 to 5-Jul-2008

SSI Data for Wavelength 312 SSI Data for Wavelength 312 nm nm

for 1-Aug-2003 to 5-Jul-2008for 1-Aug-2003 to 5-Jul-2008

Method of treatments of Method of treatments of observing dataobserving data

• We investigated TSI, different spectral ranges in We investigated TSI, different spectral ranges in SSI (1-7 nm, 30.4 nm, 121.5 nm, 312.360 nm, SSI (1-7 nm, 30.4 nm, 121.5 nm, 312.360 nm, 405.990 nm) and Cosmic Ray’s influences by 405.990 nm) and Cosmic Ray’s influences by Spectral Analyzes. This data were choose in very Spectral Analyzes. This data were choose in very huge observational data from Solar Irradiance huge observational data from Solar Irradiance Datacenter (LISIRD) by several LASP MISSIONS, Datacenter (LISIRD) by several LASP MISSIONS, receiving by Data Access Interface: receiving by Data Access Interface: http://lasp.colorado.edu

• For this we developed software programs for For this we developed software programs for selected narrow bands of investigated spectral selected narrow bands of investigated spectral ranges of SSI. ranges of SSI.

Table 1. Correlation coefficients of SSI and TSI with Cosmic Rays

variation for different Cosmic Ray Stations

Cosmic Ray Station /Wavelength

Magadan

Tbilisi Oulu

405.990 nm +0.878 +0.600 +0.89

312.360 nm -0.449 -0.373 -0.44

121.5 nm -0.791 -0.554 -0.82

30.4 nm -0.752 -0.552 -0.80

0.1-7 nm -0.616 -0.528 -0.63

TSI -0.424 -0.270 -0.44

ResultsResults•By analysis of the temporal By analysis of the temporal

changes of the high-cadence time changes of the high-cadence time series in TSI, SSI and CR revealed series in TSI, SSI and CR revealed anti-correlation between CR and anti-correlation between CR and TSI and SSI during investigated TSI and SSI during investigated period. Only in the case of period. Only in the case of spectral range 405.990 nm take spectral range 405.990 nm take place correlation with CRs. place correlation with CRs.