\begin{table}%t1
    %\centering
\par
\caption{Used Nancay spectra of Io-related DAM.
 \label{tab1}}
\begin{tabular}{ccccc}
    \hline\hline
    \noalign{\smallskip}
  {{\rm Date}} & {{\rm UT}} & {f} & {{\rm Polari-}} &
  {{\rm Storm}} \\
 {{\rm [dd/mm/yy]}} & {{\rm [hh~mm]}} & {{\rm [MHz]}} & {{\rm zation}}$^{{a}}$ &
          {{\rm type}}$^{{b}}$ \\
            \hline
{27/11/1990} & {01:02{-}03:59} & 16.0{-}25.5 & {{\rm RH}} &
{{\rm A}} \\
{03/01/1991} & {04:55{-}06:00} & 15.0{-}24.8 & {{\rm RH}} &
{{\rm A}} \\
{04{-}05/01/1991} & {23:30{-}01:20} & 15.0{-}21.2 & {{\rm LH}} &
{{\rm C}} \\
{11{-}12/01/1991} & {23:35{-}02:43} & 15.5{-}23.3 & {{\rm LH}} &
{{\rm C}} \\
{13/01/1991} & {01:28{-}03:00} & 13.5{-}34.3 & {{\rm RH}} &
{{\rm B}} \\
{20/01/1991} & {00:13{-}03:59} & 13.0{-}29.8 & {{\rm RH}} &
{{\rm B}} \\
{01/01/1992} & {01:00{-}02:58} & 12.4{-}19.0 & {{\rm LH}} &
{{\rm C}} \\
{07{-}08/01/1992} & {23:54{-}01:09} & 20.0{-}27.7 & {{\rm RH}} &
{{\rm A}} \\
{23/01/1992} & {03:58{-}07:17} & 21.2{-}25.1 & {{\rm RH}} &
{{\rm B}} \\
{07/02/1992} & {05:29{-}06:24} & 19.7{-}33.5 & {{\rm RH}} &
{{\rm A}} \\
{26/01/1993} & {04:10{-}05:13} & 17.0{-}24.2 & {{\rm RH}} &
{{\rm A}} \\
{02/02/1993} & {05:00{-}06:16} & 15.3{-}27.8 & {{\rm RH}} &
{{\rm A}} \\
{05/02/1993} & {00:47{-}01:47} & 20.0{-}30.0 & {{\rm RH}} &
{{\rm B}} \\
{04/02/1993} & {01:29{-}02:03} & 10.0{-}19.5 & {{\rm LH}} &
{{\rm C}} \\
{12/02/1993} & {01:00{-}03:17} & 15.3{-}24.0 & {{\rm RH}} &
{{\rm B}} \\
{06/03/1993} & {01:15{-}02:43} & 17.0{-}28.3 & {{\rm RH}} &
{{\rm A}} \\
{13/03/1993} & {01:50{-}03:14} & 15.2{-}26.2 & {{\rm RH}} &
{{\rm A}} \\
{20/03/1993} & {02:45{-}03:45} & 19.9{-}31.5 & {{\rm RH}} &
{{\rm A}} \\
{16/02/1994} & {01:56{-}02:54} & 14.9{-}24.0 & {{\rm RH}} &
{{\rm A}} \\
{02/03/1994} & {02:33{-}03:45} & 19.8{-}29.1 & {{\rm RH}} &
{{\rm A}} \\
{09/03/1994} & {03:15{-}04:45} & 17.1{-}27.5 & {{\rm RH}} &
{{\rm A}} \\
{02/04/1994} & {22:38{-}23:49} & 19.5{-}27.3 & {{\rm RH}} &
{{\rm A}} \\
{10/04/1994} & {23:37{-}01:00} & 16.2{-}27.2 & {{\rm RH}} &
{{\rm A}} \\
{17/04/1994} & {01:50{-}04:41} & 15.3{-}22.5 & {{\rm LH}} &
{{\rm C}} \\
{06/04/1995} & {01:01{-}02:24} & 19.1{-}25.5 & {{\rm RH}} &
{{\rm A}} \\
{06/04/1995} & {02:53{-}05:15} & 15.0{-}23.0 & {{\rm LH}} &
{{\rm C}} \\
{13/04/1995} & {01:37{-}02:24} & 16.3{-}29.0 & {{\rm RH}} &
{{\rm A}} \\
{13/04/1995} & {04:24{-}06:03} & 15.5{-}23.2 & {{\rm LH}} &
{{\rm C}} \\
{14/04/1995} & {03:43{-}06:20} & 21.3{-}29.8 & {{\rm RH}} &
{{\rm B}} \\
{07{-}08/05/1995} & {23:43{-}00:58} & 15.3{-}19.8 & {{\rm LH}} &
{{\rm C}} \\
{15/05/1995} & {01:07{-}02:33} & 15.4{-}23.8 & {{\rm LH}} &
{{\rm C}} \\
{23/05/1995} & {00:55{-}03:25} & 20.8{-}28.5 & {{\rm RH}} &
{{\rm B}} \\
{03/05/1996} & {01:23{-}02:41} & 15.3{-}20.6 & {{\rm LH}} &
{{\rm C}} \\
{10/05/1996} & {02:20{-}04:10} & 15.8{-}24.0 & {{\rm LH}} &
{{\rm C}} \\
{11/05/1996} & {02:52{-}04:32} & 17.5{-}31.0 & {{\rm RH}} &
{{\rm B}} \\
{18/05/1996} & {03:49{-}05:11} & 18.1{-}24.3 & {{\rm RH}} &
{{\rm B}} \\
{02/06/1996} & {02:20{-}03:18} & 15.5{-}22.0 & {{\rm RH}} &
{{\rm A}} \\
{09/06/1996} & {03:49{-}04:49} & 17.9{-}27.7 & {{\rm RH}} &
{{\rm A}} \\
{19/09/1996} & {17:42{-}18:08} & 19.9{-}26.1 & {{\rm RH}} &
{{\rm A}} \\
{15/06/1997} & {01:55{-}02:55} & 15.5{-}20.5 & {{\rm RH}} &
{{\rm B}} \\
{30/06/1997} & {00:08{-}01:52} & 19.5{-}28.0 & {{\rm RH}} &
{{\rm A}} \\
{07/07/1997} & {00:57{-}03:17} & 18.9{-}26.0 & {{\rm RH}} &
{{\rm A}} \\
{14/07/1997} & {01:55{-}03:12} & 22.1{-}30.3 & {{\rm RH}} &
{{\rm A}} \\
{14/08/1997} & {21:59{-}23:38} & 20.8{-}26.4 & {{\rm RH}} &
{{\rm A}} \\
{21{-}22/08/1997} & {22:30{-}00:18} & 19.9{-}29.2 & {{\rm RH}} &
{{\rm A}} \\
{10/07/1998} & {03:20{-}04:37} & 21.1{-}31.0 & {{\rm RH}} &
{{\rm A}} \\
{17/07/1998} & {03:58{-}05:06} & 22.0{-}28.8 & {{\rm RH}} &
{{\rm A}} \\
{19/08/1998} & {03:47{-}04:52} & 17.6{-}29.3 & {{\rm RH}} &
{{\rm B}} \\
{26/08/1998} & {03:23{-}04:13} & 17.3{-}24.8 & {{\rm RH}} &
{{\rm B}} \\
{19{-}20/09/1998} & {22:53{-}02:45} & 15.0{-}33.0 & {{\rm RH}} &
{{\rm B}} \\
{08/08/1999} & {03:38{-}05:30} & 18.5{-}35.1 & {{\rm RH}} &
{{\rm B}} \\
{15/08/1999} & {04:04{-}07:01} & 22.2{-}30.8 & {{\rm RH}} &
{{\rm B}} \\
{30/08/1999} & {04:25{-}05:39} & 19.8{-}28.2 & {{\rm RH}} &
{{\rm A}} \\
{06/09/1999} & {05:14{-}07:03} & 21.8{-}27.5 & {{\rm RH}} &
{{\rm A}} \\
{09/09/1999} & {00:06{-}02:52} & 21.8{-}35.0 & {{\rm RH}} &
{{\rm B}} \\
{16/09/1999} & {00:27{-}04:17} & 16.0{-}30.8 & {{\rm RH}} &
{{\rm B}} \\
\hline
{23/09/1999} & {02:48{-}04:24} & 12.3{-}22.9 & {{\rm RH}} &
{{\rm B}} \\
{01/10/1999} & {01:02{-}03:43} & 15.8{-}25.5 & {{\rm RH}} &
{{\rm A}} \\
{08/10/1999} & {01:28{-}03:50} & 19.8{-}34.8 & {{\rm RH}} &
{{\rm A}} \\
{10/10/1999} & {21:06{-}22:48} & 21.8{-}33.4 & {{\rm RH}} &
{{\rm B}} \\
{17/10/1999} & {21:43{-}23:51} & 18.0{-}33.0 & {{\rm RH}} &
{{\rm B}} \\
{19/09/2000} & {01:48{-}04:40} & 15.8{-}25.0 & {{\rm RH}} &
{{\rm A}} \\
{26/09/2000} & {02:13{-}04:45} & 15.8{-}28.1 & {{\rm RH}} &
{{\rm A}} \\
{03/10/2000} & {03:28{-}05:04} & 18.0{-}31.0 & {{\rm RH}} &
{{\rm A}} \\
{17/10/2000} & {04:37{-}05:50} & 19.6{-}30.2 & {{\rm RH}} &
{{\rm A}} \\
{27/10/2000} & {23:05{-}23:56} & 18.7{-}26.7 & {{\rm RH}} &
{{\rm A}} \\
{03{-}04/11/2000} & {23:23{-}01:31} & 20.0{-}32.5 & {{\rm RH}} &
{{\rm A}} \\
{11/11/2000} & {00:08{-}02:25} & 19.5{-}31.0 & {{\rm RH}} &
{{\rm A}} \\
{18/11/2000} & {00:42{-}02:37} & 20.0{-}27.9 & {{\rm RH}} &
{{\rm A}} \\
{19/11/2000} & {02:38{-}04:19} & 19.5{-}29.5 & {{\rm RH}} &
{{\rm B}} \\
{31/10/2001} & {00:41{-}03:22} & 19.3{-}33.5 & {{\rm RH}} &
{{\rm A}} \\
{07/11/2001} & {01:31{-}03:15} & 18.2{-}31.8 & {{\rm RH}} &
{{\rm A}} \\
{14/11/2001} & {02:07{-}05:08} & 19.3{-}30.0 & {{\rm RH}} &
{{\rm A}} \\
{15/11/2001} & {02:55{-}05:26} & 17.3{-}31.0 & {{\rm RH}} &
{{\rm B}} \\
{10/12/2001} & {00:07{-}02:11} & 18.8{-}35.5 & {{\rm RH}} &
{{\rm B}} \\
{24/12/2001} & {00:40{-}02:36} & 17.8{-}30.8 & {{\rm RH}} &
{{\rm B}} \\
{24/12/2001} & {03:16{-}04:36} & 17.4{-}26.0 & {{\rm RH}} &
{{\rm B}} \\
{05/12/2002} & {01:20{-}03:38} & 17.0{-}21.4 & {{\rm LH}} &
{{\rm C}} \\
{13/12/2002} & {03:51{-}05:25} & 18.0{-}27.3 & {{\rm RH}} &
{{\rm B}} \\
{20/12/2002} & {02:55{-}05:30} & 18.0{-}27.5 & {{\rm RH}} &
{{\rm B}} \\
{28/12/2002} & {02:49{-}04:03} & 17.8{-}31.6 & {{\rm RH}} &
{{\rm A}} \\
{04/01/2003} & {03:38{-}05:13} & 18.0{-}28.8 & {{\rm RH}} &
{{\rm A}} \\
{11/01/2003} & {04:06{-}05:43} & 19.3{-}33.5 & {{\rm RH}} &
{{\rm A}} \\
{20/01/2003} & {22:10{-}23:48} & 17.6{-}28.3 & {{\rm RH}} &
{{\rm B}} \\
{21/01/2003} & {00:13{-}01:20} & 20.5{-}26.0 & {{\rm RH}} &
{{\rm B}} \\
{31/12/2003} & {05:00{-}06:35} & 18.1{-}29.0 & {{\rm RH}} &
{{\rm A}} \\
{07/01/2004} & {05:35{-}07:14} & 18.7{-}29.0 & {{\rm RH}} &
{{\rm A}} \\
{09/01/2004} & {00:27{-}02:42} & 17.0{-}21.8 & {{\rm LH}} &
{{\rm C}} \\
{10/01/2004} & {01:01{-}02:43} & 15.0{-}27.4 & {{\rm RH}} &
{{\rm B}} \\
{01/02/2004} & {01:05{-}02:01} & 19.5{-}28.3 & {{\rm RH}} &
{{\rm A}} \\
{08/02/2004} & {01:43{-}03:43} & 17.0{-}28.3 & {{\rm RH}} &
{{\rm A}} \\
{15/02/2004} & {02:38{-}04:15} & 17.0{-}28.1 & {{\rm RH}} &
{{\rm A}} \\
{11/03/2004} & {01:08{-}03:13} & 15.2{-}21.5 & {{\rm LH}} &
{{\rm C}} \\
{04/01/2005} & {02:45{-}04:33} & 14.0{-}21.0 & {{\rm LH}} &
{{\rm C}} \\
{27/01/2005} & {02:38{-}03:36} & 12.2{-}26.8 & {{\rm RH}} &
{{\rm A}} \\
{03/02/2005} & {03:24{-}04:47} & 15.5{-}26.7 & {{\rm RH}} &
{{\rm A}} \\
{10/02/2005} & {03:46{-}05:40} & 16.3{-}28.5 & {{\rm RH}} &
{{\rm A}} \\
{10/02/2005} & {05:45{-}07:40} & 18.0{-}25.0 & {{\rm LH}} &
{{\rm C}} \\
{27{-}28/02/2005} & {22:33{-}00:13} & 17.9{-}28.6 & {{\rm RH}} &
{{\rm A}} \\
{06{-}07/03/2005} & {23:23{-}01:06} & 18.5{-}28.2 & {{\rm RH}} &
{{\rm A}} \\
{13{-}14/03/2005} & {23:57{-}01:30} & 17.5{-}28.2 & {{\rm RH}} &
{{\rm A}} \\
{14/03/2005} & {02:07{-}04:36} & 15.7{-}22.5 & {{\rm LH}} &
{{\rm C}} \\
{06/02/2006} & {05:20{-}06:49} & 20.8{-}30.8 & {{\rm RH}} &
{{\rm A}} \\
{10{-}11/04/2006} & {23:53{-}02:23} & 15.4{-}25.0 & {{\rm LH}} &
{{\rm C}} \\
{18/04/2006} & {00:40{-}03:30} & 15.5{-}23.3 & {{\rm LH}} &
{{\rm C}} \\
{19/04/2006} & {02:10{-}03:15} & 19.5{-}29.5 & {{\rm RH}} &
{{\rm B}} \\
{07/04/2007} & {01:41{-}03:54} & 14.4{-}24.4 & {{\rm LH}} &
{{\rm C}} \\
            \hline
         \end{tabular}
\smallskip
$^{{a}}  $  RH and LH are the right-hand and left-hand polarization channels respectively. 
 $^{{b}}  $  Io-A, Io-B, and Io-C are the standard
terms (see Carr et~al. \cite{carr1983}). 
\par
   \end{table}