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| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Georgakilas, A. A. | en |
| dc.contributor.author | Koutchmy, S. | en |
| dc.contributor.author | Alissandrakis, C. E. | en |
| dc.date.accessioned | 2015-11-24T18:38:35Z | - |
| dc.date.available | 2015-11-24T18:38:35Z | - |
| dc.identifier.issn | 0004-6361 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/17363 | - |
| dc.rights | Default Licence | - |
| dc.subject | sun : chromosphere | en |
| dc.subject | sun : transition region | en |
| dc.subject | sun : uv radiation | en |
| dc.subject | limb | en |
| dc.title | Polar surges and macrospicules: simultaneous H alpha and He II 304 angstrom observations | en |
| heal.type | journalArticle | - |
| heal.type.en | Journal article | en |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.identifier.secondary | <Go to ISI>://000078072300039 | - |
| heal.language | en | - |
| heal.access | campus | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.publicationDate | 1999 | - |
| heal.abstract | We compare simultaneous sequences of H alpha and He II 304 Angstrom images near the solar limb. We propose to distinguish polar surges and giant spicules (macrospicules), among the He II structures observed beyond the solar Limb. Polar surges have a complex structure when observed in H alpha and an eruptive nature, reminiscent of normal surges in small scale. Giant spicules are simple spikes, very narrow compared to surges. They don't go as high as polar surges and apparently have shorter lifetimes. We found that most polar surges and giant spicules observed in He II are associated with H alpha spikes; however there were cases without any corresponding H alpha structure. Furthermore we observed H alpha spikes that did not have He II counterparts. We analyze an example of a polar surge that appeared in He II well before its appearance in Her and remained visible for a longer time. Most polar surges that we observed showed a similar behavior. | en |
| heal.journalName | Astronomy and Astrophysics | en |
| heal.journalType | peer reviewed | - |
| heal.fullTextAvailability | TRUE | - |
| Appears in Collections: | Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά) - ΦΥΣ | |
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