Last update March 9, 2000 at 05:05 UTC.
[Solar and geomagnetic data - last 4
weeks (updated daily)]
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(updated daily)]
[Solar cycles 21-23 (last update
March 2, 2000)]
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[Graphical comparison of cycles 21, 22
and 23 (last update March 2, 2000)]
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17, 20 and 23 (last update March 2, 2000)]
[Historical solar and geomagnetic data charts
1954-1999]
The geomagnetic field was quiet to unsettled on March 8. Solar wind speed ranged between 411 and 487 km/sec.
Solar flare activity was moderate. Solar flux was 214.9, the planetary A index was 13 (3-hour K indices: 3323 3333, Boulder K indices: 2333 3332). Region 8891 was quiet and is rotating over the west limb. Region 8898 was mostly unchanged and quiet. The region has minor M class flare potential. Region 8899 was quiet and stable. Region 8900 decayed slowly and was mostly quiet. Region 8901 was quiet and stable, as were regions 8902 and 8903. New region 8904 emerged in the northern hemisphere near the central meridian. New region 8905 emerged in the southeast quadrant. New region 8906 rotated into view at the southeast limb. This is a large region capable of major flaring. New region 8907 emerged in the southeast quadrant near region 8905.
11 C flares and 1 M flare were recorded on March 8. Region 8899 produced a C2.8 flare at 17:57 UTC. Most of the other C flares and the M flare had their origin in region 8906. The M flare was an impulsive M1.4 event at 02:00 UTC.
The background x-ray flux is at the class C1 level.
No obvious coronal holes are approaching geoeffective positions.
The geomagnetic field is expected to be quiet to unsettled on March 9-10. Long distance medium wave (AM) band propagation along east-west paths over high and upper middle latitudes is poor.
| Coronal holes (1) | Coronal mass ejections (2) | M and X class flares (3) |
 |
|
 |
1) Effects from a coronal hole could reach earth within the next 5 days.
2) Material from a CME is likely to impact earth within 96 hours.
3) There is a possibility of either M or X class flares within the next 48 hours.
Green: 0-20% probability, Yellow: 20-60% probability, Red: 60-100% probability.
| Solar region | Date numbered | Actual no. sunspots | Location at midnight | Area | Classification | Comment |
|---|---|---|---|---|---|---|
| 8891 | 20000225 | 5 | S16W83 | 0270 | CSO | |
| 8892 | 20000226 | N06W77 | plage | |||
| 8896 | 20000229 | N20W43 | plage | |||
| 8898 | 20000302 | 21 | S13W06 | 0470 | EKI | beta-gamma |
| 8899 | 20000303 | 6 | S12W33 | 0030 | CSO | |
| 8900 | 20000304 | 23 | S15W38 | 0220 | ESO | |
| 8901 | 20000305 | 6 | S13E29 | 0030 | BXO | |
| 8902 | 20000306 | 3 | S18E49 | 0040 | HSX | |
| 8903 | 20000307 | 7 | S12E09 | 0040 | DAO | |
| 8904 | 20000308 | 7 | N26W06 | 0030 | CRO | |
| 8905 | 20000308 | 5 | S06E22 | 0020 | BXO | |
| 8906 | 20000308 | 12 | S17E68 | 0740 | HKX | |
| 8907 | 20000308 | 7 | S17E22 | 0040 | DSO | |
| Total number of sunspots: | 102 | |||||
| Month | Average solar flux | International sunspot number | Smoothed sunspot number |
|---|---|---|---|
| 1999.02 | 141.9 | 66.1 | 84.6 (+2.0) |
| 1999.03 | 126.3 | 69.1 | 83.8 (-0.8) |
| 1999.04 | 117.2 | 63.9 | 85.4 (+1.6) |
| 1999.05 | 148.4 | 106.3 | 90.4 (+5.0) |
| 1999.06 | 169.8 | 137.7 | 93.0 (+2.6) |
| 1999.07 | 165.6 | 113.5 | 94.4 (+1.4) |
| 1999.08 | 170.7 | 93.7 | 97.5 (+3.1) |
| 1999.09 | 135.7 | 70.9 | (102.6 predicted, +5.1) |
| 1999.10 | 164.8 | 116.4 | (107.7 predicted, +5.1) |
| 1999.11 | 191.5 | 132.7 | (110.2 predicted, +2.5) |
| 1999.12 | 169.8 | 86.4 | |
| 2000.01 | 158.1 | 90.2 | |
| 2000.02 | 174.1 | 112.3 | |
| 2000.03 | 216.2 (1) | 48.8 (2) |
1) Running average based on the daily 20:00 UTC solar flux value at 2800 MHz..
2) Unofficial, accumulated value. The official value is typically 25-40% less.
This report has been prepared by Jan Alvestad. It is based partly on my own observations and interpretations, and partly on data from sources in solar links. Comments and suggestions are always welcome.
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