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System for predicting levels of tropospheric ozone in ambient
air - it is fully automated system based on modern and World
recognized models. It is used in full National Weather and forecast
levels of ground-level ozone for 2 days ahead, by implementing regulations and
recognized European quality criteria for forecast. Updates every 12 hours.
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The total amount of ozone in the atmosphere is measured in Dobson units (DU), which represent the height of total ozone, reduced to normal pressure and temperature in units of 0.01 mm.
Its values vary considerably depending on the season. For the period 1996 - 2012, there was a trend for an increase in ozone over Bulgaria with around 0.3 DU per year.
In April 2013 monthly value: 350
In April 2012 monthly value was: 336
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The level of ultraviolet radiation presents with UV - index. Values below 2 level is considered low, for values of 2 to 5 - average and over 5 - high. Currently:
UV-radiation in Sofia - HIGH.
Required protection.
Apart from the daily weather and seasons, UV-index depends on the cloudiness. In the forecast for tomorrow blue color shows possible values.
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The vector of the Earth's magnetic field at a point on Earth is
represented by its three components - horizontal component,
the angle between the direction of the horizontal component and the geographic north (declination)
and the vertical component. In quiet conditions the components change during the course of each day in small limits,
and magnetic storms when their variations are reinforced repeatedly.
Over the past 24 hours:
Variation of the horizontal component is: 63 nT.
(0.27 percent of average 23757 nT.)
This corresponds to a quiet state.
Estimated Local Geomagnetic K - indices from station "Panagyurishte"
| |
00-03UT |
03-06UT |
06-09UT |
09-12UT |
12-15UT |
15-18UT |
18-21UT |
21-24UT |
| 22.05 |
01 |
02 |
03 |
01 |
02 |
02 |
03 |
01 |
| 23.05 |
00 |
03 |
01 |
01 |
00 |
00 |
00 |
00 |
| 24.05 |
00 |
02 |
02 |
04 |
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Geomagnetic activity is a measure of disturbances of Earth's magnetic field on a global scale
and is represented by Kp - Index. Values below 4 mean quiet state, values between 4 and 5 - active, than 5 - magnetic storm.
Situation at the moment: QUIET. Three-hour index - 3
Over the last 24 hours: QUIET. Maximum three-hour index - 3
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Estimated critical frequencies of the ionosphere over Bulgaria could be useful
for radio amateurs and to all who deal with short-wave radio.
Apart from the daily time and season, they depend on the level of geomagnetic activity during the last day.
State of the ionosphere today: QUIET.
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