Friday, September 10, 2021

Congratulations to the EVE Team!

NASA 36.353 sounding rocket flight to calibrate SDO EVE and several other satellite instruments was a great success. Hre's the proof, exposures from both the MEGS-A and MEGS-B CCDs in the calibration EVE. The top image is from the MEGS-A CCD with MEGS-A1 spectrum on top and MEGS-A2 spectrum and MEGS-SAM X-ray image on the bottom. The bottom CCD image is the MEGS-B spectrum that goes diagonally across the CCD. The bright (yellow and red) vertical stripes are the spectral lines of the Sun that EVE studies. Just seeing these spectral lines means our Sun has a magnetic field. Without the magnetic field this part of the spectrum would be empty.

I can't wait to see the movie.

Congratulations to the EVE for a successful flight!

Thursday, September 9, 2021

EVE Calibration Rocket Flies over WSMR Today

Today the EVE Calibration Rocket will fly above White Sands Missile Range (WSMR) near Las Cruces, NM. The launch window opens at 11:25 am MT (1:25 pm ET) and closes at 12:05 pm MT (2:05 pm ET). The EVE team is watching the Sun. The goal is to measure the quiet Sun and any significant flare will delay the launch until the effects of the flare fade. After parachuting to the ground, Rocket EVE will be re-calibrated at NIST's SURF in Maryland.

These calibration rockets are needed to track the changes in the EVE and AIA instruments that have been in orbit for over 11 years. Instruments that measure the extreme ultraviolet are extremely sensitive to contamination. Even small amounts of hydrocarbons (such as Teflon) landing on the CCDs inside the instruments can reduce the amount of light reaching the pixels. Comparing the data from the instruments in space with the data from the “clean” calibration instrument gives the correction factor we need.

Check out the LASP news release for more information.

Here's to a great launch and successful recovery!

Wednesday, August 4, 2021

Station Keeping maneuver #23, August 4, 2021

SDO will execute Station Keeping maneuver #23 today from 2230-2314 UTC (6:30-7:14 pm ET). During a maneuver SDO science data may be missing or blurred. These maneuvers are needed to maintain SDO's assigned position as it passes through the geostationary orbit belt.

EVE FOV and HMI/AIA Flatfield calibration maneuvers, July 21, 2021

SDO will execute EVE FOV and HMI/AIA Flafield maneuvers today. The maneuver should take about 4 hours. During a maneuver SDO science data may be missing or blurred. These maneuvers are needed to keep the instruments accurately nmeasuring solar data.

EVE Cruciform Maneuver, July 14, 2021

SDO will execute an EVE Cruciform maneuver. The maneuver should take about 6 hours. During a maneuver SDO science data may be missing or blurred. These maneuvers are needed to keep EVE accurately nmeasuring the solar EUV spectral irradiance.

Tuesday, July 6, 2021

Some Fireworks over the Weekend!

At 1430 UTC (10:30 am ET) on July 3, 2021, the first X-class flare (actually an X1.5 flare) of Solar Cycle 25 was seen on the Sun.

There were also several B and C flares, and even one M flare in the day before the X1.5 flare. You can see this series near the limb in the upper right (a clock position of about 2:00) in this daily movie in SDO's AIA 94 Å passband. These flares were also seen in the EVE on SDO and the XRS on GOES-16.

There was no active region associated with the X1.5 flare. A large region of magnetic field that was rotating off the disk is probably the home of the flares.

Solar Cycle 25 is starting to get more interesting!

Monday, June 28, 2021

Coronal Loops are Nice to Look At!

As Solar Cycle 25 starts becoming more active, coronal loops have become more common and beautiful. Here is a movie from June 24, 2021, showing the decaying remnants of AR 12833 rotating off the Sun in the upper right and the just-forming AR 12835 rotating into view in the lower left. You can see small filaments in and around the two active regions, with a very nice filament liftoff in the area following AR 12833.
There are many filaments visible around the limb of the Sun. In the lower left, around 7:30, you can see what looks like a coronal cavity (a filament surrounded by a dark, more-or-less circular, region.
Solar Cycle 25 is looking good!