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.
| Month | Chan. | Qual. | # obs. | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 201009 | LHE-10 | AR | 589 | -161 | -163 | -164 | -165 | -167 | -167 | -167 | -167 | -166 | -166 | -164 | -164 | -163 | -163 | -162 | -162 | -159 | -157 | -157 | -156 | -154 |
| 201008 | LHE-10 | AR | 716 | -137 | -138 | -140 | -142 | -144 | -146 | -148 | -150 | -152 | -154 | -155 | -157 | -160 | -161 | -163 | -164 | -162 | -159 | -161 | -160 | -155 |
| 201007 | LHE-10 | AR | 740 | -133 | -134 | -136 | -138 | -140 | -142 | -143 | -146 | -148 | -149 | -151 | -153 | -154 | -156 | -158 | -159 | -159 | -158 | -159 | -159 | -155 |
| 201006 | LHE-10 | AR | 720 | -135 | -136 | -137 | -140 | -143 | -144 | -146 | -148 | -151 | -152 | -154 | -156 | -158 | -159 | -161 | -163 | -162 | -160 | -160 | -158 | -156 |
| 201005 | LHE-10 | AR | 743 | -134 | -134 | -131 | -136 | -141 | -144 | -144 | -145 | -150 | -148 | -153 | -154 | -157 | -158 | -159 | -161 | -161 | -159 | -160 | -159 | -155 |
| 201004 | LHE-10 | AR | 695 | -131 | -130 | -130 | -135 | -137 | -138 | -137 | -140 | -143 | -145 | -148 | -150 | -152 | -153 | -155 | -157 | -158 | -156 | -154 | -153 | -151 |
| 201003 | LHE-10 | AR | 736 | -131 | -133 | -134 | -136 | -137 | -138 | -138 | -140 | -142 | -144 | -146 | -148 | -150 | -152 | -153 | -154 | -154 | -151 | -149 | -149 | -147 |
| 201002 | LHE-10 | AR | 630 | -132 | -135 | -135 | -136 | -137 | -140 | -141 | -142 | -143 | -145 | -146 | -149 | -150 | -151 | -153 | -155 | -154 | -150 | -149 | -150 | -147 |
| 201001 | LHE-10 | AR | 51 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 200912 | LHE-10 | AR | 213 | -130 | -131 | -132 | -133 | -134 | -136 | -138 | -139 | -140 | -142 | -144 | -146 | -148 | -150 | -151 | -152 | -152 | -149 | -147 | -147 | -144 |
| 200911 | LHE-10 | AR | 718 | -132 | -129 | -134 | -138 | -139 | -137 | -139 | -142 | -141 | -145 | -148 | -152 | -155 | -156 | -158 | -159 | -158 | -155 | -152 | -150 | -148 |
| 200910 | LHE-10 | AR | 737 | -132 | -132 | -128 | -135 | -139 | -140 | -137 | -139 | -145 | -145 | -150 | -151 | -153 | -155 | -157 | -159 | -157 | -155 | -154 | -153 | -151 |
| 200909 | LHE-10 | AR | 704 | -138 | -138 | -133 | -135 | -144 | -147 | -147 | -148 | -153 | -149 | -154 | -155 | -157 | -159 | -162 | -164 | -163 | -161 | -160 | -157 | -153 |
| 200908 | LHE-10 | AR | 380 | -139 | -140 | -141 | -144 | -146 | -147 | -150 | -152 | -155 | -156 | -158 | -160 | -161 | -162 | -164 | -164 | -162 | -157 | -155 | -154 | -152 |
| 200906 | LHE-10 | AR | 198 | -139 | -140 | -136 | -139 | -147 | -149 | -149 | -150 | -154 | -152 | -156 | -159 | -161 | -162 | -165 | -166 | -164 | -161 | -162 | -161 | -159 |
| 200905 | LHE-10 | AR | 579 | -136 | -137 | -132 | -136 | -143 | -145 | -145 | -146 | -151 | -151 | -154 | -153 | -157 | -159 | -160 | -162 | -162 | -159 | -159 | -161 | -158 |
| 200904 | LHE-10 | AR | 688 | -135 | -134 | -133 | -139 | -141 | -141 | -141 | -144 | -146 | -147 | -151 | -154 | -156 | -157 | -159 | -161 | -160 | -158 | -158 | -157 | -152 |
| 200903 | LHE-10 | AR | 701 | -133 | -133 | -136 | -139 | -140 | -139 | -140 | -143 | -143 | -146 | -149 | -153 | -156 | -158 | -160 | -161 | -160 | -156 | -154 | -152 | -151 |
| 200902 | LHE-10 | AR | 672 | -117 | -117 | -118 | -119 | -119 | -119 | -119 | -118 | -117 | -115 | -113 | -112 | -111 | -110 | -108 | -106 | -105 | -104 | -102 | -101 | -99 |
| 200901 | LHE-10 | AR | 719 | -131 | -133 | -134 | -136 | -138 | -139 | -141 | -143 | -145 | -147 | -149 | -151 | -153 | -155 | -157 | -157 | -155 | -152 | -151 | -149 | -148 |
| 200812 | LHE-10 | AR | 726 | -130 | -134 | -136 | -136 | -136 | -139 | -140 | -141 | -143 | -145 | -148 | -150 | -153 | -155 | -156 | -157 | -156 | -153 | -152 | -151 | -149 |
| 200811 | LHE-10 | AR | 646 | -135 | -135 | -133 | -136 | -141 | -142 | -140 | -141 | -146 | -146 | -151 | -152 | -154 | -156 | -157 | -159 | -159 | -156 | -154 | -152 | -150 |
| 200810 | LHE-10 | AR | 731 | -136 | -136 | -129 | -135 | -142 | -145 | -144 | -143 | -151 | -150 | -154 | -153 | -156 | -159 | -161 | -162 | -159 | -156 | -153 | -152 | -151 |
| 200809 | LHE-10 | AR | 694 | -138 | -139 | -139 | -141 | -144 | -146 | -147 | -149 | -151 | -152 | -154 | -155 | -157 | -159 | -160 | -160 | -159 | -157 | -156 | -153 | -151 |
| 200808 | LHE-10 | AR | 95 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |