With weekly maneuvers, the average sun angle can be kept 4-8deg more than the SEV angle.
These values refer to well-developed wind waves of the open sea. The instrument PI from JHU/APL determined that when the detector was pointed in the general direction of the sun, the sector pointed toward the sun showed large increases in particle flux.
From 1300UT May 12 to 1300 UT May 13 there was a problem in the SEC ACE RTSW data. This results in the spacecraft antenna aspect angle being kept between 5 and 9 degrees and never pointing directly back at earth. A third problem was induced by the solar noise problem: Whenever the P5 channel became noisy the P1 and P3 data would drop out. In addition, the 310-580 keV (P5) channel became elevated and erratic on November 1 and 2 during a second solar energetic particle event. ======================================================================== The new proton channels cover the following energy ranges: 47-68 keV, 115-195 keV, 310-580 keV, and 1.06-1.9 MeV. On October 29 the ACE EPAM 65-112 keV (P2) and 112-187 keV (P3) energy channels became spuriously high following the onset of a large solar energetic particle event and have not returned to nominal values.
instrument has a series of channel electron multipliers (CEMs) and larger sun angles allows more responsive CEMs to measure the solar wind. There was factor of 3 decrease which matches expected values.
November 3, 2003 ACE EPAM Data Problems. ACE 1-hour averaged real-time data and historical data can be retrieved from the SWPC ftp service ACE2 directory and for historical data back to August, 2000 from solarsoft.
Severe geomagnetic storms can result in electric utility blackouts over a wide area. The only impact from removing the sunward sector data is larger fluctuations in the data when the flux is near background levels. Current Wind Speed map for Kansas. Software eliminates most of the problem data, but not all problem data.
2/2/98 - The Magnetometer data is still in spacecraft coordinates (RTN). May 19, 2005 SIS DATA noise. May 5, 2006 ACE RTSW SWEPAM Data Improvement.
The EPAM instrument team and SEC are investigating the cause of these problems and a possible cure. October 19, 2010 EPAM Energy Range Now Corrected on SWPC Website. Occasionally short dropouts occur during a tracking pass, usually due to data transmission problems. Charts. The NASA Advanced Composition Explorer (ACE) satellite enables SWPC to give advance warning of geomagnetic storms. This channel is impacted by above normal temperatures on ACE. Possible cures are being investigated by the instrument team and SEC. At 0000 UTC on June 1, 2006, the ACE RTSW SWEPAM data processing will be updated.
SEC flags the data in the data base and does not plot the data on the web site. SWEPAM: All data nominal.
February 4, 2004 EPAM Data Switched from LEMS30 to LEMS120, Real-time proton data from the EPAM LEMS30 instrument has been replaced with similar proton data from the LEMS120 sensor. The ACE RTSW SWEPAM data processing was updated at 0000 UTC June 1, 2006.
Wind Speed Conversion by Tim Brice and Todd Hall Enter a wind speed that you would like: Answers: mph (miles per hour) mph: knots: knots: m/s (meters per second) m/s: ft/s (feet per second) ft/s: km/h (kilometers per hour) km/h What are the formula for the wind speed conversion script?
========================================================================, July 26, 2000 ACE EPAM Data Lists Header Line Changes. The location of ACE at the L1 libration point between the Earth and the Sun, about 1,500,000 km forward of Earth, enables ACE to give up to one hour advance warning of the arrival of damaging space weather events at Earth. APL is looking at this issue. The ACE satellite was launched in 1997 and has been providing real-time data for use in forecasting to NOAA since 1998. The 1060-1910 keV (P7) channel remains but has also begun to show noise. Where v is the equivalent wind speed at 10 metres above the sea surface and B is Beaufort scale number.
Anyone with questions about these data should contact Douglas Biesecker(link sends e-mail). As a result the data from the 65-112 keV (P2), 112-187 keV (P3), and 310-50 keV (P5) energy channels have been removed from the real-time plots and lists. ======================================================================== This channel will be replaced by late February. # UT Date Time ------------------ Protons keV ---------------- The most significant impact will be higher RTSW density values during low-speed, low-density solar wind conditions. This update should result in improved RTSW magnetic field values that CRL is down for antenna repair and is expected up in two months.
The P5 channel appears to have recovered; however, this does not preclude similar problems in the future. Geomagnetic storms impact the electric power grid, aircraft operations, GPS, manned spaceflight, and satellite operations, to name some of the most damaging. The most significant impact will be improved, higher density values. Wed 21/10 Wind Speed .
January 25, 2002 EPAM P1 Channel Data Update. Prior to this time, the CEMs that had been exposed had done so for the life of the mission and they had degraded to where reliable solar wind parameters had become difficult to extract. ACE RTSW MAG, EPAM, and SIS data are unaffected.
ACE MAG data processing was updated at 0000 UTC on 24 August, 2004. Geomagnetic storms are a natural hazard, like hurricanes and tsunamis, which the National Oceanic and Atmospheric Administration (NOAA) Space Weather Prediction Center (SWPC) forecasts for the public's benefit. Problems two and three were solved by the removal of the data from the sunward sectors for all channels. Latest Weather Updates. The files are updated every 3 hours beginning at 0010UT. When the spacecraft antenna is pointed directly towards earth, the spacecraft's sun angle will be equal to the Sun-Earth-Vehicle angle. The energy range of this channel is covered by the other existing channels. However, most of the data are available from either NOAA or solarsoft.
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