Noise Levels at Different Periods
The table below gives the decibel 10% noise level (in db) for each month in
several period bands. The 10% noise level is defined as the signal
level not exceeded 10% of the time, based on hourly measurements. Each entry in the
table is color coded with reference to the New Low Noise Model (NLNM, Peterson, 1993):
navy, -6 db < value-NLNM < -3 db
blue, -3 db < value-NLNM < 3 db
aqua, 3 db < value-NLNM < 6 db
lime, 6 db < value-NLNM < 9 db
yellow, 9 db < value-NLNM < 12 db
orange, 12 db < value-NLNM < 15 db
red, 15 db < value-NLNM < 20 db
fuchsia, 20 db < value-NLNM < 25 db
silver, value-NLNM < -6 db, value-NLNM > 25 db
Black indicates that there was an insufficient number of hourly measurements to calculate a noise level.
| Stat. | Chan. | Qual. | # obs. | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s | 8s | 7s | 6s | 5s | 4s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ALE-II | LHE-00 | AR | 2688 | -175 | -177 | -178 | -180 | -181 | -181 | -181 | -182 | -183 | -183 | -183 | -182 | -181 | -179 | -177 | -172 | -165 | -159 | -156 | -156 | -156 | -147 | -136 | -130 | -130 | -131 |
| KBS-IU | LHN-00 | AR | 2590 | -170 | -171 | -173 | -175 | -177 | -177 | -178 | -179 | -180 | -180 | -181 | -181 | -180 | -179 | -177 | -173 | -166 | -160 | -159 | -159 | -161 | -154 | -143 | -136 | -133 | -129 |
| KBS-IU | LHE-00 | AR | 2595 | -172 | -174 | -174 | -176 | -178 | -178 | -179 | -180 | -181 | -182 | -182 | -182 | -180 | -179 | -176 | -173 | -166 | -160 | -157 | -158 | -160 | -153 | -143 | -135 | -132 | -128 |
| ALE-II | LHE-10 | AR | 2688 | -168 | -171 | -173 | -175 | -177 | -178 | -179 | -180 | -181 | -181 | -182 | -181 | -180 | -179 | -176 | -172 | -165 | -159 | -156 | -156 | -156 | -147 | -136 | -130 | -130 | -131 |
| ALE-II | LHN-00 | AR | 2688 | -170 | -173 | -175 | -176 | -178 | -178 | -179 | -180 | -181 | -181 | -182 | -182 | -180 | -179 | -176 | -172 | -164 | -157 | -155 | -154 | -155 | -146 | -134 | -128 | -128 | -129 |
| KBS-IU | LHE-10 | AR | 2541 | -157 | -159 | -161 | -163 | -165 | -166 | -168 | -170 | -171 | -172 | -174 | -175 | -175 | -174 | -173 | -171 | -165 | -159 | -157 | -158 | -160 | -153 | -143 | -136 | -133 | -129 |
| SPA0-NO | BHN-00 | AR | 2637 | -150 | -153 | -156 | -158 | -161 | -163 | -165 | -167 | -169 | -170 | -172 | -174 | -175 | -176 | -176 | -173 | -166 | -160 | -157 | -157 | -160 | -153 | -142 | -135 | -131 | -127 |
| ALE-II | LHN-10 | AR | 2688 | -168 | -170 | -173 | -175 | -177 | -178 | -179 | -179 | -180 | -181 | -181 | -181 | -180 | -178 | -176 | -172 | -164 | -157 | -155 | -154 | -155 | -146 | -134 | -128 | -128 | -129 |
| BORG-II | LH1-00 | AR | 2688 | -177 | -179 | -180 | -180 | -180 | -180 | -181 | -182 | -183 | -183 | -183 | -182 | -181 | -180 | -177 | -173 | -165 | -156 | -149 | -146 | -145 | -137 | -119 | -108 | -107 | -107 |
| BORG-II | LH2-00 | AR | 2688 | -176 | -177 | -179 | -179 | -180 | -180 | -180 | -181 | -181 | -182 | -182 | -182 | -181 | -180 | -178 | -174 | -166 | -157 | -150 | -146 | -146 | -137 | -118 | -107 | -106 | -107 |
| KBS-IU | LHN-10 | AR | 2541 | -152 | -154 | -156 | -158 | -160 | -162 | -164 | -165 | -167 | -168 | -170 | -171 | -172 | -173 | -173 | -170 | -164 | -159 | -158 | -158 | -160 | -153 | -143 | -136 | -132 | -128 |
| SFJD-IU | LHE-00 | AR | 2592 | -160 | -162 | -164 | -165 | -167 | -169 | -171 | -173 | -174 | -176 | -177 | -178 | -178 | -178 | -177 | -174 | -167 | -160 | -156 | -154 | -154 | -145 | -128 | -119 | -119 | -121 |
| SFJD-IU | LHN-10 | AR | 2592 | -169 | -171 | -172 | -173 | -174 | -176 | -176 | -177 | -179 | -180 | -180 | -180 | -179 | -178 | -176 | -172 | -165 | -158 | -153 | -151 | -153 | -145 | -130 | -121 | -121 | -123 |
| SFJD-IU | LHN-00 | AR | 2592 | -167 | -170 | -171 | -172 | -173 | -174 | -175 | -176 | -177 | -178 | -179 | -178 | -177 | -176 | -175 | -172 | -165 | -158 | -153 | -151 | -153 | -145 | -130 | -122 | -122 | -123 |
| SFJD-IU | LHE-10 | AR | 2592 | -164 | -166 | -167 | -169 | -171 | -172 | -172 | -172 | -176 | -178 | -178 | -179 | -178 | -177 | -175 | -172 | -165 | -159 | -154 | -153 | -153 | -144 | -128 | -120 | -119 | -122 |
| DAG-GE | LHN | AR | 2653 | -152 | -154 | -156 | -159 | -161 | -163 | -165 | -167 | -168 | -169 | -170 | -171 | -172 | -172 | -170 | -168 | -163 | -158 | -155 | -155 | -156 | -147 | -135 | -129 | -128 | -131 |
| SPA0-NO | BHE-00 | AR | 2637 | -152 | -154 | -156 | -158 | -160 | -161 | -162 | -163 | -164 | -164 | -164 | -165 | -165 | -165 | -165 | -165 | -163 | -159 | -157 | -158 | -160 | -153 | -142 | -134 | -130 | -126 |
| DAG-GE | LHE | AR | 2653 | -153 | -154 | -157 | -159 | -161 | -163 | -165 | -166 | -168 | -168 | -168 | -169 | -169 | -169 | -169 | -167 | -162 | -157 | -154 | -154 | -155 | -146 | -135 | -129 | -129 | -131 |
| FRB-CN | BHN | AR | 2638 | -149 | -150 | -151 | -152 | -153 | -154 | -154 | -155 | -156 | -157 | -158 | -158 | -158 | -158 | -158 | -157 | -155 | -153 | -153 | -153 | -152 | -143 | -135 | -128 | -126 | -130 |
| FRB-CN | BHE | AR | 2638 | -151 | -152 | -152 | -153 | -154 | -155 | -155 | -156 | -156 | -156 | -156 | -155 | -154 | -153 | -154 | -153 | -152 | -151 | -151 | -153 | -152 | -142 | -134 | -128 | -126 | -128 |
| RES-CN | BHN | AR | 2638 | -137 | -138 | -139 | -141 | -142 | -144 | -145 | -147 | -149 | -150 | -151 | -152 | -153 | -154 | -154 | -154 | -153 | -152 | -151 | -152 | -151 | -142 | -134 | -130 | -130 | -132 |
| RES-CN | BHE | AR | 2638 | -136 | -138 | -139 | -140 | -142 | -143 | -145 | -146 | -148 | -150 | -151 | -151 | -152 | -153 | -153 | -152 | -153 | -152 | -152 | -152 | -151 | -142 | -134 | -129 | -129 | -131 |
| JMIC-NO | BHE-00 | AR | 2688 | -144 | -144 | -145 | -147 | -147 | -147 | -148 | -149 | -150 | -151 | -152 | -153 | -154 | -155 | -156 | -158 | -158 | -155 | -150 | -147 | -144 | -137 | -122 | -114 | -111 | -110 |
| BORG-II | LHN-10 | AR | 2688 | -143 | -144 | -144 | -146 | -146 | -147 | -148 | -149 | -151 | -151 | -152 | -154 | -155 | -156 | -157 | -160 | -159 | -155 | -149 | -146 | -146 | -137 | -118 | -107 | -107 | -107 |
| BORG-II | LHE-10 | AR | 2688 | -142 | -143 | -144 | -145 | -146 | -147 | -147 | -148 | -149 | -150 | -150 | -152 | -154 | -155 | -156 | -158 | -158 | -154 | -149 | -145 | -145 | -137 | -118 | -108 | -106 | -107 |
| JMIC-NO | BHN-00 | AR | 2688 | -141 | -143 | -144 | -144 | -145 | -146 | -147 | -147 | -149 | -150 | -151 | -152 | -153 | -154 | -156 | -157 | -158 | -154 | -149 | -146 | -143 | -136 | -121 | -114 | -112 | -109 |
| SUMG-GE | LHN | AR | 2688 | -116 | -118 | -119 | -121 | -122 | -123 | -125 | -127 | -129 | -131 | -133 | -135 | -137 | -139 | -141 | -143 | -145 | -146 | -146 | -147 | -148 | -140 | -123 | -116 | -116 | -120 |
| SUMG-GE | LHE | AR | 2688 | -111 | -113 | -114 | -115 | -116 | -118 | -119 | -121 | -123 | -124 | -126 | -128 | -129 | -131 | -134 | -136 | -138 | -140 | -142 | -144 | -145 | -139 | -125 | -119 | -119 | -122 |