subroutine SetSolarConst( SolarFlux )


    ! USE statements
    !

    ! ヒストリデータ出力
    ! History data output
    !
    use gtool_historyauto, only: HistoryAutoAddVariable, HistoryAutoPut

    ! 時刻管理
    ! Time control
    !
    use timeset, only: TimeN, TimesetClockStart, TimesetClockStop

    ! 時系列データの読み込み
    ! Reading time series
    !
    use read_time_series, only: SetValuesFromTimeSeriesWrapper


    real(DP), intent(out):: SolarFlux


    !
    ! Work variables
    !


    ! 初期化確認
    ! Initialization check
    !
    if ( .not. set_solarconst_inited ) then
      call MessageNotify( 'E', module_name, 'This module has not been initialized.' )
    end if


    ! 計算時間計測開始
    ! Start measurement of computation time
    !
    call TimesetClockStart( module_name )


    if ( SolarConstFile == '' ) then

      SolarFlux = SolarConst

    else

      call SetValuesFromTimeSeriesWrapper( SolarConstFile, "SolarConst", SolarFlux, "SolarConst" )

    end if


    call HistoryAutoPut( TimeN, "SolarConst", SolarFlux )


    ! 計算時間計測一時停止
    ! Pause measurement of computation time
    !
    call TimesetClockStop( module_name )


  end subroutine SetSolarConst

  subroutine SetSolarConstInit


    ! ファイル入出力補助
    ! File I/O support
    !
    use dc_iounit, only: FileOpen

    ! ヒストリデータ出力
    ! History data output
    !
    use gtool_historyauto, only: HistoryAutoAddVariable

    ! NAMELIST ファイル入力に関するユーティリティ
    ! Utilities for NAMELIST file input
    !
    use namelist_util, only: namelist_filename, NmlutilMsg, NmlutilAryValid


    !
    ! Work variables
    !
    integer:: unit_nml        ! NAMELIST ファイルオープン用装置番号.
                              ! Unit number for NAMELIST file open
    integer:: iostat_nml      ! NAMELIST 読み込み時の IOSTAT.
                              ! IOSTAT of NAMELIST read

    ! NAMELIST 変数群
    ! NAMELIST group name
    !
    namelist /set_solarconst_nml/ SolarConst, SolarConstFile
          !
          ! デフォルト値については初期化手続 "set_solarconst#SetSolarConstInit"
          ! のソースコードを参照のこと.
          !
          ! Refer to source codes in the initialization procedure
          ! "set_solarconst#SetSolarConstInit" for the default values.
          !

    if ( set_solarconst_inited ) return


    ! デフォルト値の設定
    ! Default values settings
    !

!!$    SolarConst     = 1380.0_DP
    SolarConst     = 1366.0_DP

    SolarConstFile = ''


    ! NAMELIST の読み込み
    ! NAMELIST is input
    !
    if ( trim(namelist_filename) /= '' ) then
      call FileOpen( unit_nml, namelist_filename, mode = 'r' ) ! (in)

      rewind( unit_nml )
      read( unit_nml, nml = set_solarconst_nml, iostat = iostat_nml )             ! (out)
      close( unit_nml )

      call NmlutilMsg( iostat_nml, module_name ) ! (in)
    end if


    call HistoryAutoAddVariable( "SolarConst", (/ 'time' /), "solar constant", 'W m-2' )              ! (in)

    ! 印字 ; Print
    !
    call MessageNotify( 'M', module_name, '----- Initialization Messages -----' )
    call MessageNotify( 'M', module_name, '  SolarConst     = %f', d = (/ SolarConst /) )
    call MessageNotify( 'M', module_name, '  SolarConstFile = %c', c1 = trim( SolarConstFile ) )
    call MessageNotify( 'M', module_name, '-- version = %c', c1 = trim(version) )

    set_solarconst_inited = .true.

  end subroutine SetSolarConstInit