Product: Weekly Highlights and Forecasts
:Issued: 2025 Mar 17 0140 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services
#
# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity 10 - 16 March 2025
Solar activity was at moderate levels on 11 and 14 March with two M1.1 flares observed. The first M1.1 flare was observed at 11/1304 UTC from Region 4024 (N05, L=289, class/area Cro/020 on 11 Mar). The second M1.1 flare was observed at 14/2221 UTC from Region 4030 (S16, L=123, class/area Eso/090 on 15 Mar). No significant radio or CMEs were associated with these events. The remainder of the highlight period was at low levels.
At about 16/0900 UTC, dimming and a possible DSF was observed near Region 4023 (N25, L=177, class/area Hsx/030 on 11 Mar). A likely faint, slow CME was observed in LASCO C2 imagery with a weak Earth-directed component expected to arrive midday on 20 Mar.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at high levels on 10-16 March with a peak flux of 5,060 pfu observed at 16/1445 UTC.
Geomagnetic field activity was at quiet to unsettled levels on 10-11 March. Activity levels increased to active to minor storm (G1-Minor) levels on 12-13 March and an isolated moderate storm (G2-Moderate) level early on 14 March. Unsettled to active levels were observed for the remainder of 14 March through 15 March with mostly quiet to unsettled levels on 16 March. The enhanced activity levels on 12-16 March were due to a negative polarity CH HSS. During the active period, solar wind speeds peaked at 500-550 km/s, Bt reached 12 nT and Bz reached -10 nT levels.
Forecast of Solar and Geomagnetic Activity 17 March - 12 April 2025
Solar activity is expected to be at a chance for R1-R2 (Minor-Moderate) levels through the outlook period.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at high levels on 17, 29-31 March and 06-12 April due to recurrent CH HSS influences. Normal to moderate levels are expected for the rest of the outlook period.
Geomagnetic field activity is expected to be at unsettled to active levels on 17-21 March due to a combination of negative polarity CH HSS effects and weak CME effects. Active to minor storm (G1-Minor) levels are expected on 25-28 March due to recurrent positive
polarity CH HSS effects. Active to minor to major storm (G1-G2/Minor-Moderate) levels are expected on 04-12 April due to recurrent negative polarity CH HSS effects. Quiet to unsettled levels are expected for the remainder of the period (subject to
change with any CME activity).
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2025 Mar 17 0140 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services
#
# 27-day Space Weather Outlook Table
# Issued 2025-03-17
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2025 Mar 17 180 12 4
2025 Mar 18 180 15 4
2025 Mar 19 185 10 3
2025 Mar 20 190 10 3
2025 Mar 21 195 8 3
2025 Mar 22 200 5 2
2025 Mar 23 195 5 2
2025 Mar 24 190 5 2
2025 Mar 25 180 15 4
2025 Mar 26 165 25 5
2025 Mar 27 160 25 5
2025 Mar 28 150 15 4
2025 Mar 29 150 5 2
2025 Mar 30 160 5 2
2025 Mar 31 160 5 2
2025 Apr 01 160 5 2
2025 Apr 02 150 5 2
2025 Apr 03 150 10 3
2025 Apr 04 155 20 5
2025 Apr 05 160 35 6
2025 Apr 06 160 10 3
2025 Apr 07 160 12 4
2025 Apr 08 165 35 6
2025 Apr 09 175 40 6
2025 Apr 10 180 25 5
2025 Apr 11 180 20 5
2025 Apr 12 185 10 3
(NOAA)
