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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 200809 | LHN | AR | 19 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 200808 | LHN | AR | 694 | -153 | -155 | -157 | -159 | -160 | -162 | -162 | -164 | -164 | -166 | -166 | -166 | -167 | -168 | -168 | -168 | -164 | -160 | -159 | -160 | -156 |
| 200807 | LHN | AR | 744 | -154 | -156 | -157 | -159 | -160 | -160 | -162 | -163 | -164 | -165 | -165 | -167 | -167 | -168 | -169 | -168 | -164 | -159 | -158 | -158 | -155 |
| 200806 | LHN | AR | 695 | -153 | -155 | -157 | -158 | -159 | -161 | -162 | -163 | -163 | -165 | -166 | -166 | -168 | -169 | -169 | -168 | -162 | -157 | -158 | -161 | -155 |
| 200805 | LHN | AR | 718 | -153 | -155 | -156 | -158 | -160 | -161 | -163 | -163 | -165 | -165 | -166 | -167 | -167 | -168 | -168 | -168 | -164 | -159 | -157 | -157 | -154 |
| 200804 | LHN | AR | 710 | -151 | -153 | -154 | -156 | -158 | -160 | -162 | -163 | -164 | -165 | -167 | -168 | -169 | -169 | -170 | -169 | -163 | -158 | -156 | -155 | -152 |
| 200803 | LHN | AR | 723 | -149 | -151 | -152 | -154 | -155 | -157 | -158 | -160 | -161 | -163 | -164 | -165 | -167 | -168 | -169 | -168 | -162 | -156 | -154 | -153 | -149 |
| 200802 | LHN | AR | 696 | -147 | -148 | -149 | -150 | -152 | -153 | -154 | -156 | -157 | -158 | -159 | -161 | -162 | -164 | -165 | -165 | -160 | -154 | -151 | -150 | -144 |
| 200801 | LHN | AR | 737 | -144 | -145 | -146 | -148 | -149 | -151 | -152 | -153 | -155 | -157 | -158 | -159 | -161 | -162 | -163 | -164 | -160 | -155 | -152 | -151 | -146 |
| 200712 | LHN | AR | 728 | -145 | -146 | -147 | -149 | -150 | -151 | -153 | -155 | -157 | -158 | -160 | -161 | -163 | -164 | -165 | -164 | -160 | -155 | -152 | -151 | -145 |
| 200711 | LHN | AR | 670 | -147 | -148 | -149 | -151 | -152 | -154 | -156 | -158 | -159 | -161 | -162 | -164 | -165 | -166 | -167 | -167 | -163 | -156 | -153 | -152 | -150 |
| 200710 | LHN | AR | 713 | -151 | -152 | -154 | -156 | -156 | -158 | -160 | -161 | -162 | -164 | -165 | -167 | -168 | -169 | -169 | -169 | -164 | -158 | -154 | -152 | -151 |
| 200709 | LHN | AR | 150 | -154 | -157 | -160 | -160 | -162 | -164 | -163 | -165 | -166 | -167 | -167 | -167 | -169 | -169 | -169 | -169 | -162 | -158 | -158 | -159 | -151 |
| 200708 | LHN | AR | 722 | -154 | -156 | -157 | -158 | -159 | -160 | -162 | -163 | -164 | -166 | -166 | -167 | -168 | -169 | -169 | -168 | -163 | -158 | -159 | -160 | -157 |
| 200707 | LHN | AR | 729 | -154 | -155 | -156 | -158 | -159 | -160 | -161 | -162 | -163 | -164 | -165 | -167 | -167 | -169 | -169 | -169 | -165 | -161 | -159 | -161 | -157 |
| 200706 | LHN | AR | 656 | -153 | -155 | -157 | -157 | -159 | -160 | -162 | -163 | -164 | -165 | -166 | -167 | -168 | -169 | -169 | -170 | -165 | -159 | -159 | -161 | -156 |
| 200705 | LHN | AR | 733 | -150 | -152 | -153 | -155 | -157 | -158 | -160 | -161 | -162 | -163 | -165 | -166 | -167 | -168 | -168 | -167 | -162 | -158 | -158 | -160 | -154 |
| 200704 | LHN | AR | 689 | -151 | -153 | -155 | -156 | -157 | -158 | -160 | -161 | -162 | -164 | -164 | -166 | -167 | -167 | -168 | -164 | -158 | -154 | -152 | -152 | -146 |
| 200703 | LHN | AR | 679 | -153 | -155 | -156 | -157 | -159 | -160 | -161 | -163 | -164 | -165 | -166 | -168 | -169 | -170 | -170 | -169 | -163 | -156 | -154 | -154 | -150 |
| 200702 | LHN | AR | 153 | -147 | -148 | -150 | -151 | -153 | -154 | -156 | -157 | -158 | -159 | -161 | -162 | -164 | -165 | -167 | -165 | -159 | -150 | -147 | -149 | -147 |