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NOVEMBER 2003


Saturday, November 1:
The geomagnetic field was at unsettled to minor storm levels. Solar wind speeds have gradually decreased from the start of the period, approximately 850 km/s to 600 km/s (at the time of this writing: 21.00 UTC) while the Bz component of the interplanetary magnetic field has remained consistently northward during the period.

Sunday, November 2:
The geomagnetic field was at unsettled to minor storm levels. Isolated minor storm conditions were likely due to the continued elevated solar winds speeds and the occasional southward Bz in the interplanetary magnetic field. Solar wind speed ranged between 469 and 624 km/s, the planetary A index was 18.

Monday, November 3:
The geomagnetic field was at quiet to active levels. Solar wind speed ranged between 464 and 568 km/s, the planetary A index was 10.

Tuesday, November 4:
The geomagnetic field was at quiet to severe storm levels. A shock passage occurred at the ACE satellite near 06:00 UTC due to the CME from the X8 event on November 2. A sudden impulse of 72 nT was observed by the Boulder magnetometer at 06:27 UTC. The Bz component of the interplanetary magnetic field remained north though most of the day; however, an isolated period of severe storm conditions was observed from 09:00 to 12:00 UTC. Solar wind speed ranged between 461 and 697 km/s, the planetary A index was 31.

Wednesday, November 5:
The geomagnetic field was at quiet to unsettled levels. Solar wind speed ranged between 464 and 596 km/s, the planetary A index was 9.

Thursday, November 6:
The geomagnetic field was at quiet to minor storm levels. The shock from the X28 flare on November reached Earth at 19:37 UTC. A 31nT sudden impulse was observed on the Boulder magnetometer and activity reached minor storm levels. The Bz component of the interplanetary magnetic field initially turned south to -7 nT and total field measurement reached 15 nT. Solar wind speed ranged between 440 and 592 km/s, The planetary A index was 14.

Friday, November 7:
The geomagnetic field was at quiet to unsettled levels. Solar wind speed ranged between 395 and 582 km/s, generally decreasing all day. The planetary A index was 8.

Thursday, November 8:
The geomagnetic field was at quiet to unsettled levels. A fairly weak high speed stream arrived at about 13:00 UTC. While the interplanetary magnetic field has at times been moderately southwards, only a mild response has been observed on the geomagnetic field. Solar wind speed ranged between 408 and 502 km/s, the planetary A index was 10.

Saturday, November 9:
The geomagnetic field was at quiet to major storm levels. An isolated major storm period occurred from 12:00-15:00 UTC. Solar wind speed ranged between 466 and 602 km/s under the influence of a high speed coronal stream. The planetary A index was 25.

Monday, November 10:
The geomagnetic field was at quiet to major storm levels. An isolated major storm period occurred from 12:00-15:00 UTC. Solar wind speed ranged between 466 and 602 km/s under the influence of a high speed coronal stream. The planetary A index was 25.

Tuesday, November 11:
The geomagnetic field ranged from active to severe storm levels. A single K=7 period was observed at Boulder from 03:00-06:00 UTC. Solar wind speed ranged between 596 and 776 km/s under the influence of a high speed coronal stream. The planetary A index was 51.

Wednesday, November 12:
The geomagnetic field was at unsettled to minor storm levels. Solar wind speed ranged between 607 and 761 km/s under the influence of a high speed coronal stream. The planetary A index was 26.

Thursday, November 13:
The geomagnetic field ranged from unsettled to minor storm levels, with a period of major storm levels at high latitudes. The interplanetary magnetic field became stronger after 11:00 UTC. Solar wind speed ranged between 581 and 759 km/s under the influence of a high speed coronal stream. The planetary A index was 42.

Friday, November 14:
The geomagnetic field ranged from unsettled to major storm levels. Mostly minor storm levels predominated beginning at 21:00 UTC on November 13 through 15:00 UTC on November 14. Solar wind speed ranged between 569 and 719 km/s under the influence of a high speed coronal stream. The planetary A index was 37.

Monday, November 17:
The geomagnetic field has been at active to minor storm levels. The favorably positioned coronal hole continued to cause high solar wind speeds, and the accompanying southward Bz of the interplanetary magnetic field, have kept the geomagnetic field activity at elevated levels throughout the period.

Tuesday, November 18:
The geomagnetic field was at quiet to minor storm levels. Solar wind speed ranged between 610 and 761 km/s. The high speed stream appeared to be ending late in the day. The planetary A index was 20.

Wednesday, November 19:
The geomagnetic field has been at quiet to active levels. Solar wind speed ranged between 451 and 646 km/s, the planetary A index was 14.

Thursday, November 20:
The geomagnetic field was at quiet to extremely severe storm levels. A CME shock arrived at SOHO and was observed at 07:40 UTC, and a geomagnetic sudden impulse was observed at 08:05 UTC. A very strong (55 nT) southward component of the interplanetary magnetic field resulted in severe geomagnetic storming during the latter half of the day. Solar wind speed ranged between 431 and 915 km/s., the planetary A index was 117.

Friday, November 21:
The geomagnetic field was at quiet to severe storm levels. Solar wind speed ranged between 446 and 581 km/s, the planetary A index was 39.

Saturday, November 22:
The geomagnetic field has been at mostly quiet to unsettled levels.

Sunday, November 23:
The geomagnetic field was at quiet to minor storm levels. Solar wind speed ranged between 466 and 601 km/s under the influence of a high speed coronal stream. The planetary A index was 21.

Monday, November 24:
The geomagnetic field was quiet to unsettled with isolated active periods at higher latitudes. A well positioned coronal hole is producing solar wind speeds near 600 km/s, creating a weak disturbance in the geomagnetic field. Solar wind speed ranged between 462 and 615 km/s, the planetary A index was 12.

Tuesday, November 25:
The geomagnetic field was quiet to unsettled with isolated active periods. The disturbed periods are due to a moderate high speed solar wind stream from a well positioned coronal hole. Solar wind speed ranged between 494 and 706 km/s, the planetary A index was 13.

Thursday, November 27:
The geomagnetic field was quiet to unsettled on November 27. Solar wind speed ranged between 400 and 527 km/s, gradually decreasing all day. The planetary A index was 10.

Sunday, November 30:
The geomagnetic field was at quiet to unsettled levels. Ace data indicated that a weak recurrent coronal hole high speed stream became geoeffective early in the period. Solar wind speed ranged between 365 and 544 km/s, the planetary A index was 10.

Sources:
SEC / NOAA and STAR


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