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Propagation

NOAA STI

:Product: Geophysical Alert Message wwv.txt
:Issued: 2023 Jun 05 1805 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
#
# Geophysical Alert Message
#
Solar-terrestrial indices for 04 June follow.
Solar flux 168 and estimated planetary A-index 10.
The estimated planetary K-index at 1800 UTC on 05 June was 0.67.

No space weather storms were observed for the past 24 hours.

No space weather storms are predicted for the next 24 hours.

NOAA Alerts

Space Weather Message Code: ALTK04
Serial Number: 2377
Issue Time: 2023 Jun 04 2102 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2023 Jun 04 2059 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

NOAA Observations

NOAA Scales Activity

NOAA Scale	Past 24 hrs	Current	Fcst 24 hrs
Range 1 (minor) to 5 (extreme)
Geomagnetic Storms	None	None	None
Solar Radiation Storms	None	None	None
Radio Blackouts	None	None	None

DX Cluster WWV announcements

Hour	By	Comment
0900	AE5E	SFI=143, A=4, K=1, Minor w/R1 -> Minor w/R1
0900	VE1DX	SFI=80, A=6, K=0, No Storms -> No Storms
0900	AE5E	SFI=84, A=5, K=0, No Storms -> No Storms
0900	VE7CC	SFI=87, A=5, K=3, No Storms -> Minor w/G1
0900	VE1DX	SFI=91, A=4, K=0, No Storms -> No Storms

Propagation Links

Title	Rating
QRK System Proposal for QRK system
HamSCI
WWV Solar Flux with A and K indexes
Proppy: Online HF propagation predictions using ITU P.533. Online area and point-to-point predictions using the ITU application ITURHFProp.
Band Conditions
PSKreporter.de - Digital Mode Automatic Propagation Reporter PSKreporter displays the digital mode data of transmitting and receiving stations in selectable views with additional information.
DR2W DX Propagation DX Propagation by DR2W! High resolution SNR maps in pseudo color. Propagation based on the actual sunspot number.
WA5IYX VHF Propagation Info
Current Solar-Terrestrial/Propagation Data for Your Website You can now add the current Solar-Terrestrial/Propagation Data to your web site for free (with no ads). This data is available as a 4k, .gif image 255 X 175, 155 X 300 or 460 X 125 stickers, in multiple color schemes. Now includes calculated propagation conditions using the index and flux numbers obtained.
Solar Cycle 24.com Solar Cycle 24 / VHF Aurora / amateur radio website.
LX4SKY Amateur Radio Activities History of amateur radio, propagation analysis and program reviews of VOACAP, WinCAP Wizard, DX Tool Box, and 54 other HF Prop software, portable HF operation, mystery of radials, SWR, transmission lines, basics of aerial antennas, longwire and yagi antennas, Yaesu FT1000MP Mark-V review, Kenwood TS-570D(G) review, principles of amplification, RFI solutions, and lots more.
William Hepburn's VHF/UHF Tropospheric Ducting Forecast
ON4AA On-Line HF Propagation Prediction Learn about your current local HF propagation conditions and obtain a forecast in a snap!
Propfire HF Propagation Stats for Firefox Propfire is a propagation utility for the Firefox webbrowser. It displays current HF propagation data in your status bar.
VOACAP Quick Guide Guide to using VOACAP, free professional HF prediction software from NTIA/ITS.
160M Propagation
KG0VL VHF Aurora Radio Research
KV5R's Getting Started in NVIS Antenna and Propagation Experimentation Near-Vertical Incident Skywave propagation is generally considered to be F-layer reflection at angles of 70-90 degrees. It is skywave propagation without the usual skip zone. The purpose of NVIS is to communicate locally and regionally, out to about 300 miles, with moderate power, simple antennas, and no skip zone. NVIS fills in the blank spot between groundwave and low-angle skywave.
NVIS: Near Vertical Incidence Skywave NVIS, or Near Vertical Incidence Skywave, refers to a radio propagation mode which involves the use of antennas with a very high radiation angle, approaching or reaching 90 degrees (straight up), along with selection of an appropriate frequency below the critical frequency, to establish reliable communications over a radius of 0-200 miles or so.
Amateur Chirp Project (Ionospheric Sounding) Amateur projects to investigate radiowave propagation - G3PLX's chirp project, ionosonde database, and more...