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projects:jupiter:intercont-2024-04-06 [2024/05/24 16:47] wucknitz |
projects:jupiter:intercont-2024-04-06 [2024/08/28 09:26] (current) wucknitz |
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| The same setup as in earlier observations was used. This time we had KAIRA, NenuFAR, LWA1, LWA-SV, LWA-NA, LWA-OVRO (unfortunately no useful data this time), DE602,603,604,605,609, FR606, SE607, PL610, PL612, IE613, LV614. DE601 was out of order, and the other DE stations used an incorrect pointing (position of Jupiter one month earlier), but still show signals. | The same setup as in earlier observations was used. This time we had KAIRA, NenuFAR, LWA1, LWA-SV, LWA-NA, LWA-OVRO (unfortunately no useful data this time), DE602,603,604,605,609, FR606, SE607, PL610, PL612, IE613, LV614. DE601 was out of order, and the other DE stations used an incorrect pointing (position of Jupiter one month earlier), but still show signals. | ||
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| + | ===== Presentations ===== | ||
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| + | Some results were shown at conferences: | ||
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| + | {{:projects:jupiter:lfm2024.pdf|Talk by Olaf Wucknitz on 2024-06-07}} at the [[https://indico.lofar.eu/event/3/|LOFAR Family Meeting 2024]] | ||
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| + | {{:projects:jupiter:067_wucknitz.pdf|Poster}} at the [[https://events.mpifr-bonn.mpg.de/indico/event/371/|16th EVN Symposium in Bonn, 2-6 September 2024]] | ||
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| For the plots below I uses a polarisation combination that should be close to the dominant circular sense. This is $X+{\rm i}Y$ for NenuFAR and the LWA and $X-{\rm i}Y$ for LOFAR and KAIRA. I only plot a limited part of the band. | For the plots below I uses a polarisation combination that should be close to the dominant circular sense. This is $X+{\rm i}Y$ for NenuFAR and the LWA and $X-{\rm i}Y$ for LOFAR and KAIRA. I only plot a limited part of the band. | ||
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| + | Historical note: Fringes on EU, US and EU-US baselines were first seen on the screen on 21st May 2024. The plots shown below were produced later. | ||
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| ==== Transatlantic baselines ==== | ==== Transatlantic baselines ==== | ||
| + | We start with baselines to NenuFAR, because it is by far the most sensitive European station. Residual delays are still large, therefore we use again the higher spectral resolution of 390.625MHz. | ||
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| + | === NenuFAR - LWA 1 === | ||
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| + | {{:projects:jupiter:nenufar_lwa1_1.png?300|NenuFAR-LWA1, full range}} | ||
| + | {{:projects:jupiter:nenufar_lwa1_2.png?300|NenuFAR-LWA1, zoom in}} | ||
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| + | In the zoom in, fringes can be seen at all frequencies. | ||
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| + | === NenuFAR - LWA_NA === | ||
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| + | {{:projects:jupiter:nenufar_lwa_na_1.png?300|NenuFAR-LWA_NA, full range}} | ||
| + | {{:projects:jupiter:nenufar_lwa_na_2.png?300|NenuFAR-LWA_NA, zoom in}} | ||
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| + | In the zoom in, we do again see the regular pattern in frequency of higher and lower coherence and oscillating noise in the phases. | ||
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| + | === NenuFAR - LWA_SV === | ||
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| + | {{:projects:jupiter:nenufar_lwa_sv_1.png?300|NenuFAR-LWA_SV, full range}} | ||
| + | {{:projects:jupiter:nenufar_lwa_sv_2.png?300|NenuFAR-LWA_SV, zoom in}} | ||
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| + | In the zoom in, we see how the high/low noise frequencies are a different from the ones seen in LWA_NA. | ||
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| + | === DE602 - LWA1 === | ||
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| + | With 7970 km this is the longest projected baseline: | ||
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| + | {{:projects:jupiter:de602_lwa1_1.png?300|DE602-LWA1, full range}} | ||
| + | {{:projects:jupiter:de602_lwa1_2.png?300|DE602-LWA1, zoom in}} | ||
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| + | === KAIRA - LWA1 === | ||
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| + | [[https://www.sgo.fi/KAIRA/index.php|KAIRA]] is very special, because it is not part of the general astronomical LOFAR array, but mostly used for ionospheric work. Thanks to the tremendous help of Derek McKay, it often participates in astronomical (VLBI and otherwise) observations. The projected baseline length to LWA1 is 6775 km. | ||
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| + | {{:projects:jupiter:kaira_lwa1_1.png?300|DE602-LWA1, full range}} | ||
| + | {{:projects:jupiter:kaira_lwa1_2.png?300|DE602-LWA1, zoom in}} | ||
