Viewing archive of torsdag, 28 april 2011
Solaktivitetsrapport
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Rapport för sol- och geofysisk aktivitet 2011 Apr 28 2200 UTCSkapad av NOAA © SWPC och bearbetad av SpaceWeatherLive.com
USAF/NOAA rapport för sol- och geofysisk aktivitet
SDF Nummer 118 publicerat klockan 2200Z på 28 Apr 2011IA. Analys av solfläcksgrupper och solaktivitet från 27-2100Z till 28-2100Z Solar activity has been at low levels for the past 24
hours. Several C-class events were observed throughout the period,
the largest being a C2 flare at 28/1203Z from Region 1199 (N18W48).
Region 1196 (S23W32) regained sunspots and also produced a lower
level C-class event. Regions 1202 (N15W38) and 1203 (N19E77) were
numbered today. Region 1202 emerged as a simple beta group, while
Region 1203 rotated onto the east limb as an alpha group.
IB. Prognos för solaktivitet
Solar activity is expected to be at
low levels for the next three days (29 April - 01 May). There also
remains a slight chance for M-class events with Region 1203 rotating
onto the disk and Region 1195 and 1199 continuing to grow and
evolve.
IIA. Sammanfattning av geofysisk aktivitet 27-2100Z till 28-2100Z
The geomagnetic field has been at quiet levels for the past 24 hours.
Measurements by the ACE spacecraft show a solar sector boundary
crossing occurred at 28/1445Z. Solar wind speed increased from
around 320 - 360 km/s, behind a 12 hour bump in density. The Phi
angle also rotated from a positive influence to a negative.
IIB. Prognos för geofysisk aktivitet
The geomagnetic field is
expected to remain at mostly quiet levels for day 1 (29 April) of
the forecast period. On days 2 and 3 (30 April - 01 May), unsettled
to active levels with isolated periods of minor storming are
expected, due to the arrival of a coronal hole high-speed stream.
III. Chans för solutbrott från 29 Apr till 01 May
| M-klass | 05% | 05% | 05% |
| X-klass | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observerad 28 Apr 110 Prognoserat 29 Apr-01 May 110/110/105 90 Day Mean 28 Apr 107
V. Geomagnetiskt A-index
Observerad Afr/Ap 27 Apr 000/003 Förväntat Afr/Ap 28 Apr 001/003 Prognoserat Afr/Ap 29 Apr-01 May 005/005-010/010-012/012
VI. Chanser för geomagnetisk aktivitet från 29 Apr till 01 May
| A. Medelhöga breddgrader | |||
|---|---|---|---|
| Aktivt | 10% | 35% | 40% |
| Små stormförhållanden | 01% | 05% | 10% |
| Svåra stormförhållanden | 01% | 01% | 01% |
| B. Höga breddgrader | |||
|---|---|---|---|
| Aktivt | 10% | 35% | 40% |
| Små stormförhållanden | 01% | 05% | 15% |
| Svåra stormförhållanden | 01% | 01% | 01% |
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Rymdvädersfakta
| Senaste X-utbrottet | 2024/05/05 | X1.2 |
| Senaste M-utbrottet | 2024/05/05 | M8.3 |
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| Fläckfria dagar | |
|---|---|
| Senaste dag utan solfläckar | 2022/06/08 |
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|---|---|
| april 2024 | 136.5 +31.6 |
| Last 30 days | 153.8 +59.7 |