Observations 2023-12-27 20:30-22:30 UTC

This time was chosen because of a good chance to see DAM signals from both hemispheres of Jupiter, so that they can be calibrated relative to each other. We observed with NenuFAR, the LWA (LWA1, LWA-SV), KAIRA, and a number of LOFAR stations (all six of GLOW, PL612, IE613, LV614). It is very sad that our Ukrainian friends cannot participate with UTR2 anymore.

All LOFAR(-like) stations observed in RCU mode 3 (band 10_90) with 8-bit recording of 244 subbands (40-283, 8-55 MHz). Beamforming was done in direction 0.5826639,0.2118205,J2000 or 0,0,JUPITER.

Diagnostic plots for all participating LOFAR stations (and eventually NenuFAR, ) can be found here. They all show clear signatures from Jupiter in the dynamic spectra even at this very low resolution.

Here are beamlet statistics (dynamic spectrum) just before the observations:

This plot was taken from the realtime display at https://www.sgo.fi/KAIRA/bst.php. It shows nice DAM signals (possibly Io-B, north).

People involved: Derek McKay

Beamlet statistics (dynamic spectra for XX and YY) from NenuFAR show the great performance of this telescope:
20231227_202900_bst_sum_up_glisse_s_.pdf

These plots show the strong (Io-B?) arc, but unfortunately not the expected (Io-D) counterpart from the southern hemisphere that we had hoped for. The exact nature of these signals needs to be investigated. In any case the signal is clearly strong enough for a VLBI analysis.

Here are plots from data taken before our observation (kindly provided by Laurent Lamy):
20231227_140000_20231227_202900_jupiter_tracking.pdf
He writes: "(1) It confirmes that the prominent vertex-early arcs are RH polarized (white on the bottom panel) and therefore consistent with Io-B emission (2) at the lowest frequencies, LH emission (black on the bottom panel) is seen continuously after 16:30, including what might be a signature of Io-D emission after 18:00".

This means we have a good chance to see emission from both hemispheres at least at the beginning of our observation.

People involved: Laurent Lamy, Jean-Mathias Griessmeier, Philippe Zarka, Louis Bondonneau

The LWA participated with the stations LWA1 and LWA-SV with director's time in project DW005. The schedule file DW005_231227_2230_0001.idf was used. It defines two tunings with 19.6 MHz bandwidth each, one centred on 16.078125000 MHz, one on 31.390625000 MHz.

People involved: Greg Taylor, Jayce Dowell

The German LOFAR stations DE601,602,603,604,605,609 observed using the standard scheduling system in mode UDP2lanesRCU3. They all produced data, but DE601 had strong noise and dropped out too early. They all have their own RFI. I also recorded subband statistics (SST) and beamlet statistics (BST) with 1-sec time resolution for all stations, as well as 1-sec TBB dumps with DE604 and DE605 every about 8 minutes.

Plots of the BST files (dynamic spectra) can be found here.

People involved: Olaf Wucknitz, Francesco Angelo Iraci, Sai Chaitanya Susarla, Krishnakumar Moochickal Ambalappat

People involved: Mariusz Pożoga

People involved: Tomasz Sidorowicz

People involved: Joe McCauley, Corentin Louis

LV614 started a bit late, but also continued for a bit longer.

People involved: Janis Steinbergs