{"id":31,"date":"2008-12-03T10:22:10","date_gmt":"2008-12-03T01:22:10","guid":{"rendered":"http:\/\/guas-astronomy.jp\/weblog2\/?p=31"},"modified":"2008-12-03T10:22:10","modified_gmt":"2008-12-03T01:22:10","slug":"signature_of_chromospheric_dow","status":"publish","type":"post","link":"https:\/\/guas-astronomy.jp\/weblog\/?p=31","title":{"rendered":"Signature of Chromospheric Downflows in Acoustic Travel-time Measurements from Hinode"},"content":{"rendered":"<p>\u3010\u65e5\u6642\u301112\u67085\u65e5(\u91d1)\u300010:30\uff5e12:00<br \/>\n\u3010\u5834\u6240\u3011\u56fd\u7acb\u5929\u6587\u53f0\u30fb\u4e09\u9df9\u3000\u5317\u78141\u968e\u8b1b\u7fa9\u5ba4<br \/>\n\u3010\u30bf\u30a4\u30c8\u30eb\u3011Signature of Chromospheric Downflows in Acoustic Travel-time Measurements from Hinode<br \/>\n\u3010\u767a\u8868\u8005(\u656c\u79f0\u7565)\u3011\u9577\u5cf6 \u85ab\uff08\u7dcf\u7814\u5927 D2\u30fb\u4e09\u9df9\u3001\u6307\u5c0e\u6559\u54e1 \u95a2\u4e95 \u9686)<br \/>\nWe report on detection of chromospheric downflows in two emerging magnetic flux regions by time-distance helioseismology analysis. We use both chromospheric intensity oscillation data in Ca ii H line and photospheric Dopplergrams in Fe i 557.6nm line observed by Solar Optical Telescope (SOT) onboard Hinode for our analyses. By crosscorrelating oscillation signals, we have detected a travel-time anomaly in these emergingflux regions; outward travel time is about a half minute shorter than inward travel time in the Ca ii H data but not in the Fe i data. This can be interpreted as a signature of downflows in chromosphere.<br \/>\nThe downflow speed is estimated at \uff5e 8 km\/s, which is consistent with the typical picture of emerging-flux regions. This result demonstrates a new possibility of studying chromospheric flows by time-distance analysis.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3010\u65e5\u6642\u301112\u67085\u65e5(\u91d1)\u300010:30\uff5e12:00 \u3010\u5834\u6240\u3011\u56fd\u7acb\u5929\u6587\u53f0\u30fb\u4e09\u9df9\u3000\u5317\u78141\u968e\u8b1b\u7fa9\u5ba4 \u3010\u30bf\u30a4\u30c8\u30eb\u3011Signature of Chromospheric Downflows in Acoustic Travel-ti [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,5],"tags":[],"class_list":["post-31","post","type-post","status-publish","format-standard","hentry","category-6","category-5"],"_links":{"self":[{"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/31","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=31"}],"version-history":[{"count":0,"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=\/wp\/v2\/posts\/31\/revisions"}],"wp:attachment":[{"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/guas-astronomy.jp\/weblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}