Latest Solar Activity Reports
SOLAR UPDATE
Solar X-rays:
Geomagnetic Field: |
| |
From maj.com
Here is the SOLAR FLUX UPDATE CHART (updated daily)
Solar flux and sunspot numbers were up this week. Average solar flux was up almost 40 points from last week's average flux, and average sunspot numbers were up by almost 50 points. The most active geomagnetic day was Saturday, November 13, when the planetary A index was 31 and the K index rose as high as five.
This weekend for the ARRL November Sweepstakes (phone) expect a solar flux of 210, 200 and 200 on Friday through Sunday, and planetary A index of 20, 20 and 12 for the same three days. The absorption on Friday and Saturday could be a little rough for HF operators, but by Sunday it may die down.
After the weekend expect the solar flux to bottom out around 150 from November 26 until the end of the month, then rise above 200 around December 6. From November 29 to December 3 geomagnetic conditions should be stable, with another rough patch around December 4-6.
Sunspot numbers for November 11 through 17 were 340, 324, 251, 232, 213, 231 and 248 with a mean of 262.7. The 10.7 cm flux was 239.8, 231.9, 223.8, 218.8, 205.6, 233.4 and 221.3, with a mean of 224.9. The estimated planetary A indices were 23, 10, 31, 10, 6, 16 and 10, with a mean of 15.1.
SOLAR UPDATE
Sun watcher Tad Cook, K7VVV, Seattle, Washington, reports: Solar flux had a spectacular increase over the past week, with values around 200. Flux values stayed above 190 until October 16.
Geomagnetic conditions were quite stormy October 10-17, when the planetary A index ranged from 21 to 34. This was caused by a series of coronal holes and flares, streaming charged particles in a high speed solar wind. October 18-20 the planetary A index was in the single digits, with many periods having a K index of 1. On October 21, the effects of a coronal mass ejection a couple of days earlier could be seen, with K indices back up above 4.
The latest forecast for the A index is 25 to 30 for October 22, 10 for October 23, and 15 to 20 October 24, due to a coronal hole. The predicted solar flux is 150, 145 and 140 for the same period. After the weekend the solar flux is expected to bottom out around 125 from October 26-29, then rise back to 200 around November 10 or 11. Geomagnetic indices are expected to be mostly low until November 6, when recurring coronal holes are expected to keep conditions unsettled or stormy through November 13.
Sunspot numbers for October 14 through 20 were 206, 130, 189, 169, 135, 169 and 193 with a mean of 170.1. The 10.7-cm flux was 199.8, 198.2, 189, 178, 172.7, 169.6 and 158.8, with a mean of 180.9. The estimated planetary A indices were 24, 24, 21, 26, 6, 7 and 4, with a mean of 16.
:Issued: 2000 Jul 25 0309 UT
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Environment Center.
#
# Geophysical Alert Message
#
Solar-terrestrial indices for 24 July follow.
Solar flux 225 and Boulder A-index 7.
The Boulder K-index at 0300 UT on 25 July was 2 (12 nT).
Solar-terrestrial conditions for the last 24 hours follow.
Solar activity was high.
The geomagnetic field was quiet to unsettled.
A major flare occurred at 0248 UT on 25 July
The forecast for the next 24 hours follows.
Solar activity will be moderate.
The geomagnetic field will be quiet to active.
:Issued: 2000 Jul 25 0250 UT
# Prepared jointly by the U.S. Dept. of Commerce, NOAA,
# Space Environment Center and the U.S. Air Force.
#
JOINT USAF/NOAA SOLAR AND GEOPHYSICAL ACTIVITY SUMMARY
SGAS NUMBER 207 ISSUED AT 0245Z ON 25 JUL 2000
THIS REPORT IS COMPILED FROM DATA RECEIVED AT SWO ON 24 JUL
A. ENERGETIC EVENTS
BEGIN MAX END RGN LOC XRAY OP 245MHZ 10CM SWEEP
NONE
B. PROTON EVENTS: NONE.
C. GEOMAGNETIC ACTIVITY SUMMARY: THE GEOMAGNETIC FIELD WAS QUIET TO
SLIGHTLY UNSETTLED.
D. STRATWARM: NONE.
E. DAILY INDICES: (REAL-TIME PRELIMINARY/ESTIMATED VALUES)
10 CM 225 SSN 215 AFR/AP 004/008 X-RAY BACKGROUND C1.5
DAILY PROTON FLUENCE (FLUX ACCUMULATION OVER 24 HRS)
GT 1 MEV 7.8E+05 GT 10 MEV 2.7E+04 P/(CM2-STER-DAY)
(GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES)
DAILY ELECTRON FLUENCE
GT 2 MEV 1.80E+06 E/(CM2-STER-DAY)
(GOES-8 SATELLITE SYNCHRONOUS ORBIT W75 DEGREES)
3 HOUR K-INDICES:
BOULDER 2 3 2 1 2 1 2 2 PLANETARY 2 3 2 2 2 3 2 2
F. COMMENTS: NONE.
Return To Main Home Page
|