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. | 518s | 439s | 373s | 316s | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202504 | LHZ-70 | AR | 710 | -183 | -185 | -186 | -187 | -187 | -186 | -185 | -184 | -184 | -183 | -183 | -184 | -185 | -186 | -185 | -185 | -183 | -181 | -177 | -172 | -163 | -158 | -157 | -155 | -151 |
| 202503 | LHZ-70 | AR | 737 | -183 | -184 | -186 | -187 | -187 | -186 | -185 | -184 | -184 | -183 | -183 | -184 | -184 | -184 | -184 | -183 | -183 | -180 | -177 | -171 | -162 | -157 | -155 | -154 | -149 |
| 202502 | LHZ-70 | AR | 672 | -183 | -185 | -186 | -187 | -187 | -186 | -185 | -184 | -183 | -183 | -183 | -184 | -184 | -184 | -183 | -182 | -181 | -179 | -175 | -169 | -160 | -154 | -151 | -152 | -149 |
| 202501 | LHZ-70 | AR | 744 | -186 | -187 | -187 | -187 | -187 | -186 | -185 | -184 | -183 | -183 | -183 | -183 | -184 | -184 | -183 | -182 | -181 | -179 | -175 | -169 | -161 | -154 | -152 | -152 | -150 |
| 202412 | LHZ-70 | AR | 744 | -184 | -186 | -187 | -187 | -187 | -186 | -185 | -184 | -184 | -184 | -184 | -184 | -184 | -184 | -184 | -183 | -181 | -179 | -176 | -170 | -162 | -155 | -152 | -150 | -146 |
| 202411 | LHZ-70 | AR | 720 | -183 | -184 | -186 | -187 | -186 | -186 | -185 | -185 | -184 | -183 | -183 | -184 | -184 | -184 | -184 | -183 | -181 | -179 | -176 | -172 | -164 | -156 | -153 | -150 | -147 |
| 202410 | LHZ-70 | AR | 744 | -182 | -184 | -185 | -185 | -185 | -186 | -185 | -184 | -184 | -183 | -183 | -184 | -185 | -185 | -184 | -183 | -182 | -180 | -177 | -172 | -163 | -157 | -154 | -152 | -150 |
| 202409 | LHZ-70 | AR | 720 | -183 | -184 | -184 | -185 | -185 | -186 | -185 | -185 | -184 | -184 | -184 | -185 | -186 | -186 | -186 | -185 | -183 | -182 | -179 | -174 | -166 | -160 | -159 | -156 | -154 |
| 202408 | LHZ-70 | AR | 742 | -182 | -183 | -185 | -186 | -185 | -185 | -184 | -184 | -184 | -184 | -184 | -185 | -186 | -187 | -187 | -186 | -184 | -182 | -179 | -174 | -165 | -159 | -159 | -159 | -157 |
| 202407 | LHZ-70 | AR | 737 | -183 | -184 | -186 | -186 | -186 | -185 | -185 | -184 | -183 | -184 | -184 | -185 | -186 | -187 | -187 | -186 | -185 | -183 | -179 | -174 | -165 | -160 | -162 | -162 | -157 |
| 202406 | LHZ-70 | AR | 720 | -185 | -187 | -188 | -188 | -187 | -187 | -186 | -186 | -185 | -185 | -185 | -185 | -187 | -187 | -187 | -186 | -185 | -183 | -179 | -175 | -166 | -161 | -162 | -161 | -156 |
| 202405 | LHZ-70 | AR | 744 | -187 | -188 | -189 | -189 | -188 | -187 | -186 | -185 | -184 | -184 | -184 | -185 | -186 | -187 | -187 | -186 | -185 | -183 | -179 | -173 | -164 | -159 | -160 | -159 | -154 |
| 202404 | LHZ-70 | AR | 720 | -185 | -187 | -187 | -188 | -188 | -187 | -186 | -185 | -184 | -184 | -184 | -185 | -186 | -186 | -185 | -185 | -183 | -181 | -178 | -173 | -164 | -159 | -158 | -155 | -152 |
| 202403 | LHZ-70 | AR | 744 | -184 | -186 | -186 | -188 | -187 | -186 | -185 | -184 | -184 | -183 | -183 | -183 | -184 | -185 | -184 | -184 | -182 | -180 | -177 | -171 | -162 | -156 | -155 | -152 | -148 |
| 202402 | LHZ-70 | AR | 696 | -185 | -186 | -187 | -188 | -188 | -187 | -185 | -185 | -183 | -183 | -183 | -184 | -184 | -184 | -184 | -183 | -182 | -180 | -176 | -170 | -161 | -155 | -151 | -150 | -147 |
| 202401 | LHZ-70 | AR | 744 | -184 | -186 | -187 | -188 | -188 | -187 | -186 | -185 | -184 | -184 | -183 | -184 | -184 | -184 | -184 | -183 | -181 | -179 | -176 | -170 | -162 | -154 | -150 | -151 | -149 |
| 202312 | LHZ-70 | AR | 740 | -185 | -187 | -188 | -188 | -187 | -187 | -185 | -184 | -184 | -183 | -183 | -183 | -184 | -184 | -183 | -182 | -181 | -179 | -175 | -169 | -161 | -153 | -149 | -148 | -146 |
| 202311 | LHZ-70 | AR | 47 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |